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How much electricity does a solar panel produce?

Avatar for Ben Zientara
Published on 07/11/2012 in
Updated 04/02/2020
Electricity sparking

The amount of electricity a solar panel produces depends on three important factors: the size of the panel, the efficiency of the solar cells inside, and the amount of sunlight the panel gets.

We’ll break down what you can expect from a typical solar panel, and how that power output compares to the power you need for the gadgets and appliances you use inside your home.

Average Solar Panel Size

When we say “solar panel,” what we’re talking about is a typical 60-cell silicon photovoltaic panel for residential use. These days, most home solar panels are about 65 inches high by 39 inches wide, or 5 and a half feet tall and a little more than 3 feet wide:

If you look closely at the solar panel in the image above, you’ll notice 60 little squares aligned in 6 columns of 10 cells each. These squares are individual solar “cells,” which are linked together by wires. The cells are where electricity is made, and the wires carry the electricity to a junction box where the panel is hooked into a larger array.

Manufacturers also make solar panels with 72 cells, which are aligned in 6 columns of 12 cells each. 72-cell solar panels are also 39 inches wide, but average about 78 inches long. These larger panels are mostly used for commercial and industrial solar installations, but are increasingly popular on homes.

Why does solar panel size matter?

The more solar cells working in tandem, the more power they’ll create. That’s why the size of the panel matters if you’re trying to calculate how much electricity a panel makes.

Solar panels have been about this size for decades, but modern panels make more electricity than in the past. That’s because panel manufacturers have found ways to improve cell efficiency over time.

Comparing solar panel efficiency from 1954 to 2020

Since the first solar panels were created in 1954, the cells have become more efficient and changed shape from round to square, which means the energy-generating portion of the panel takes up a larger portion of the total surface area. These changes have caused a big increase in solar panel power output.

How efficient are solar panels?

Solar efficiency relates to the amount of available energy from the sun that gets converted into electricity.

Back in the 1950s, the first solar cells were capable of taking 6% of the energy from the sun and converting it into electricity.

If they were configured to be the same array of 60 cells you see in the image above, that would have created a current of about 20 watts electricity, about a third of what would be needed to light up a 60 watt incandescent bulb.

When we originally wrote this page in 2012, solar cells could convert 15% of the energy hitting them from the sun into power. As of 2020, the efficiency of the most advanced solar cells is closer to 25%, while average solar cells for residential use are around 19% efficient.

If you combine the efficiency of the cells with the size of the panel, you get a number called the “power rating.” In the solar industry, we say “that panel is rated to produce X watts.”

What’s the power rating for an average solar panel?

As of 2020, a typical solar panel produces around 320 watts of power, but panels come in many different wattage ratings, and finding one that produces exactly 320 watts is rare. The top 10 residential solar panels for 2020 includes panels rated to produce anywhere from 285 watts to 360 watts.

More efficient panels are a little more expensive, and are usually only needed if you have limited space on your roof.

Your solar installer will work with you to figure out how many panels you need to produce enough energy for you to use.

It generally matters less how much each panel can produce than how well the whole array performs.

How is a solar panel’s rating calculated?

Your solar panels will have a number listed on the back that indicates how much power they will pump out during ideal conditions. This is called the Standard Test Condition rating (STC for short).

Here’s what a label looks like on the back of the solar panel:

A rating label on the back of a solar panel

To determine an STC rating, solar labs test the panels under ideal conditions called “peak sun,” or 1000 watts of sunlight per square meter of surface. That’s approximately equal to the power of the sun at noon, on a sunny day, at the equator.

In the picture above, the label shows an STC rating of 250 watts for the panel. If that panel received full sun for one hour, you’d get 250 watt-hours of electricity. With 4 panels, you’d get a kilowatt hour. Click here to read more about the difference between a kilowatt and a kilowatt hour.

The Top 10 Solar Panels for Home Use in 2020

California is a great place, full of sunshine and people who love to capture it for their own use. The state does one amazing thing right when it comes to solar power, and that’s collect an archive of data about every single installed solar system in the state. From that data, which includes nearly 124,000 home solar systems installed in 2019, we pulled a list of the the top 10 solar panels used.

The table below shows the most popular solar panels in 2020, in order of number installed. As an interesting side note, the top 2 panels on this list represent 25% of all solar panels installed on homes represented here. All together, the 10 panels below represent 32% of home solar installed in California in 2019.

ManufacturerModelWattage (STC)
Q CellsQ.PEAK DUO BLK-G5 315315
REC SolarREC290TP2 BLK290
PanasonicVBHN330SA17330
SunPowerSPR-X22-360-E-AC360
Jinko SolarJKM315M-60BL315
Q CellsQ.PEAK-G4.1 305305
SunPowerSPR-X21-335-BLK-D-AC335
Q CellsQ.PLUS BFR-G4.1/TAA 285285
LG SolarLG335N1C-A5335
SunPowerSPR-X22-360-D-AC360
Based on data from California Solar Statistics for 123,811 systems for which permits were approved in 2019.

Where can you buy home solar panels?

Like we said above, the panels we’re talking about here are meant for residential rooftop solar installations. You can’t just go buy them on Amazon—though Amazon does have some great solar panel kits that use lower-wattage panels (Full disclosure, as an Amazon Associate, Solar Power Rocks may earn a commission from qualifying purchases).

No, the panels described above can are meant to be installed in a larger array on a rooftop by professional solar installers who are licensed and insured to design and install a solar system that can power your home and either feed extra extra energy back to the grid or store it in batteries.

If you’re an electrician or roofer who wants to go it alone, these panels can also be purchased from a wholesale solar supplier and installed in an on- or off-grid configuration with or without batteries. You can DIY a solar installation, although we don’t recommend it, or you can purchase the equipment wholesale

Solar panel output calculator (kWh)

Even if you live at or near the equator, you can’t expect to replicate these ideal conditions. The amount of electricity solar panels produce depends on average sunlight over the course of a year. If it’s historically more cloudy in your area, there’s less available energy from the sun to convert into electricity.

The first step to figuring out how much electricity your solar panel can produce in a year is to find your place on the globe. If you live in the United States, you can figure out how to calculate the amount of electricity a solar panel produces and how much you can save using our simple solar calculator:

If you live outside the United States, check out Weather Underground’s solar calculator. You can enter your address into it and get specific details about how much sunlight hits your house on average. The calculator also gives the option of entering a specific model of solar panel and the square footage of the panel coverage on your roof.

Solar panel output per day and per month

Using the example above of a 250-watt STC rated panel, if you multiply the 250 watts the panel produces by the number of hours of full sun you get in a day, you’ll get the amount of kwh that panel produces per day. Multiply by 30 days and you’ll get mothly kWh output for the panel.

The average roof in the United States gets about 4 hours of usable sun per day. In fact, that number is often referred to ask “peak sun hours“. We know the sun shines more than 4 hours, but “full sun” is a measurement that combines all the parts of the day when the sun is lower in the sky into one number.

Using 4 hours of full sun, gives you this equation: 250 watts x 4 hours. That’s 1 kWh (1,000 watts) in a day per 250-watt panel.

If you multiply 1kWh per panel by 30 days in a month, you’ll find that each 250 watt rated panel will produce about 30 kWh in an average month.

How much energy does a solar panel produce per square foot?

Solar panel output per square foot

The average-sized solar panel takes up an area of 17.6 square feet and produces 265 watts under direct sunlight. That translates to just over 15 watts per square foot.

How many solar panels are needed to power an average house?

Sizing a solar panel system to your home’s electric usage can be done by taking look at your energy bills over a year.

Most utility companies provide information about your last few months of usage on your bill, but you can probably get more on their website. A few lucky customers get a year and a half like this:

a sample energy bill before solar panels with usage details

We’ll spare you the trouble of averaging that column, and tell you that this house uses about 2,200 kWh per month. That’s quite a bit higher than the national average, which means the homeowner could really be helped by solar power!

Typically, homeowners in the United States use about 900 kWh a month on average. So, take 900 kWh and divide by the amount of kWh one solar panel produces over the course of a month (30kWh), and you get a 30 panel installation. 30 panels x 250 watts per panel equals a 7,500 watt system (7.5kW).

Again though, these are just rough estimates. It’s best to connect with a solar expert we trust who can appropriately size a system and help take advantage of all the local incentives to get it done right and as affordably as possible.

How much power do my devices use?

There’s huge variation in power use between households depending on what you own and how often you use everything. People in the South and West United States tend to use more electricity for heating and air conditioning, whereas people in the North and East tend to heat with gas or fuel oil.

One basic old-fashioned lightbulb uses 60 watts of electricity; a CFL uses 18 watts. Laptops often use about 45 watts, and desktops can run between 150-300 watts. Window air conditioning can range between 500 and 1500 watts, and central air conditioning can use 3500 watts.

The average home in the US uses about 1,000 kWh of electricity per month. All those little devices add up to big usage, with variations by season. Usage also varies between day and night. Unless you work at home, most of your electricity usage probably happens at night.

On or off the grid?

Since solar panels only generate power as the sun shines, you’ll need a way to store the energy. Though it’s possible to use a battery for storage, the easiest (and cheapest) solution for most people is to stay connected to the grid.

If your solar panels are producing more energy than you’re using—when you’re at work, on vacation, or just not running many devices—excess power will flow back into the grid. In many locations, utility companies offer a program called “net metering” that can compensate you for extra power you produce.

At night, or anytime you need extra power, you’ll pull it from the grid. With a grid-connected system, you’ll never need to worry if you happen to need more power than your solar system has been sized to provide. You may also choose to supply only part of your average electricity bill with solar, and use the grid for the rest.

Your solar installer will talk to you about all of the options. Interested in getting a quote? Sign up with us to get a free consultation.

Last modified: April 2, 2020

160 thoughts on “How much electricity does a solar panel produce?

  1. Avatar for Jerry Jerry says:

    4 solar panels of 150w in series how many Watts do I get on one side and the other by parallel how many Watts do I have? is it 4x150w = 600w in both cases?

  2. Avatar for ozi ozi says:

    what power output can I get per year from a 12MW solar power plant capacity, in an area with irradiation of 4.5kWh/sq.m/day and having a solar panel area of 58000sq.m

  3. Avatar for Max Max says:

    Hello, I am planning to construct a solar power farm, do you know how many solar panels I can fit per acre, and with that amount (Solar Panels) how many Kwh I would produce per hour? And if possible the cost per acre? Thank you, and have a great day.

  4. Avatar for Greta James Greta James says:

    Wow, thank you for pointing out that solar panels can more than cover the cost of your electricity for one month such as 30 panels generating about 7500 watts! About a week ago, I was talking to my sister, and she mentioned that she wants to be more sustainable and green. I want to help her make these life changes. It sounds like I will have to talk to her about getting solar panels!

  5. Avatar for Roger Ward Roger Ward says:

    How much do soloar panels (and supporting frames weigh?

  6. Avatar for Diogo Sá Diogo Sá says:

    Thanks from Portugal! Accurate and simple explanation!

  7. Avatar for Molly Anderson Molly Anderson says:

    my husband and I have called many solar companies in my area about getting panels installed on the roof of our double wide, but they all told us for warranty reasons they could not install panels on a mobile home *just in case* and encouraged us to look into installing a set up ourselves. do you have any advice on where to go and/or who to consult to get all the information we need?

    1. Avatar for Ben Zientara Ben Zientara says:

      Hey Molly-

      It’s a sad fact that installing solar panels on a manufactured home can be so challenging. If you’re looking to DIY, my favorite places on the web are Wholesale Solar and the AltE Store. If your state has good solar laws, you might be able to take advantage of community solar instead of installing on your home.

      Best of luck, and let us know how it goes!

    2. Avatar for Howard Howard says:

      There are HUD homes and IRC homes. They are built to different specifications. Even if you have a HUD home they are built with different specified roof loads.Your manufacturer should be able to provide the engineering specs that would determine whether the roof structure will bear the weight in addition to any snow load. If your home wont bear the load, how about a garage or car port?

  8. Avatar for bgtv bgtv says:

    You only talk about monocrystal
    solar cells

  9. Avatar for emma emma says:

    In the image it says about 15 watts per square foot under direct sunlight. Over how much time does it create 15 watts?

    1. Avatar for Ben Zientara Ben Zientara says:

      Hi, Emma-

      15 watts is a measure of the power produced by a square foot of the panel at any given time. That is, 15 watts of power flows into the circuit and can power up to 15 watts of “load” (a thing that uses electricity), such as a light bulb. If the panel got full sun for a whole hour, it would produce 15 watt-hours of energy, which is a measure of power produced over time. Think about it like this: power (in this case 15 watts) is the ability to do work, and energy (in this case 15 watt-hours) is a measure of the work that could be done.

      Hope that helps!

      -Ben

  10. Avatar for YASH KUMAR YASH KUMAR says:

    Very good article.

    It is very true that the size of the panel remained the same for decades but its efficiency has increased over the period of time.

    One important that also affects the performance of the solar panel is the temperature.

    An increase in temperature actually deteriorates the efficiency of the solar panel.

    The panels should be aligned in the right direction to get the maximum sunlight.

    1. Avatar for Ben Zientara Ben Zientara says:

      What’s up, Bob?

  11. Avatar for Vanessa Vanessa says:

    Hey, my friend and I need to calculate how much it would cost to implement + maintain solar panels at our school for a project. We figured out that our school needs 357315.75 kWh per month or 485 solar panels. How much would we be paying to maintain this monthly? We’re a little confused about how to calculate this. Thank you!!

  12. Avatar for Steve Fischer Steve Fischer says:

    Ben, great article! Very good, basic explanations of the complete system surrounding the installation and benefits of solar to a typical house. I put up 32 panels on my house in Houston, TX in 2014 and I generate about 1,000 kW-hrs / month on average (12 MW-hrs / yr). And my energy provider, Green Mountain Energy, offers a 100% buy-back rate for our excess production (something not all providers do).

    1. Avatar for Ben Zientara Ben Zientara says:

      Thanks, Steve!

      Great to hear you’ve made the leap and are with Green Mountain. From what I’ve heard, they’re the best REP to choose in Texas. Here’s to long, sunny days for you; now and into the future!

  13. Avatar for Kenneth Kenneth says:

    Hi can you please help me with the number of panels needed and the size of watts. If you want to install a refrigerator, TV, sound system, microwave, cattle iron and the washing machine.

  14. Avatar for john travira john travira says:

    ok this is not a good use or help of any source

    1. Avatar for Ben Zientara Ben Zientara says:

      Hey John-

      I’m sorry to hear that. Can you tell me what information you’d specifically like to see? Perhaps, how much electricity a panel can make in a day, week, month and year?

  15. Avatar for Ed Kaufholz Ed Kaufholz says:

    I have a solar panel left over from a project. It’s specs: Model Number Q.PEAK G4.1 300 BFR STC Rating 300.0 Watts PTC Rating 274.5 Open Circuit Voltage (Voc) 39.76 Volts Short Circuit Current (Isc) 9.77 Amps I know it’s overkill but what controller do I need to charge a 12V deep cycle RV battery? Thanks!

    1. Avatar for Ayam Ayam says:

      Well, given your panel rating and the nominal power of the battery, a 12V/24V 30 A charge controller should be enough.

  16. Avatar for Qamar Qamar says:

    A bit confused in KWh/KWp or Solar efficiency or Specific yield. Are these three same things?

  17. Avatar for No Thanks No Thanks says:

    Mission Solar Panels have the highest degradation rate of any Tier 1 panel and a horrible Temperature Coefficient. LG and Hanwha Q-Cell kick the crap out of Mission. This is a very misleading article

    1. Avatar for Ben Zientara Ben Zientara says:

      Thanks for your feedback, No. It’s about time we updated the table you’re referring to to reflect the latest and greatest technologies. At that time, we’ll re-assess degradation rates among Tier 1 panels.

  18. Avatar for Gary Gary says:

    Do electronic companies allow homeowners a DIY system that’s connected to the grid? I am certain I can build the system but I don’t want batteries.
    Thanks

    1. Avatar for Ben Zientara Ben Zientara says:

      Some do, some don’t. It really depends on who your Authority Having Jurisdiction (AHJ) is, and the laws in your state.

      For the most part, you can do the installation yourself, but many AHJs require a certified electrician to sign off on the installation. Others require the electrician to sign off on plans and install, and some even require a NABCEP-certified solar installer to perform all work. Check with your local housing authority or permit office to see what they require.

  19. Avatar for N Sai Abhiram N Sai Abhiram says:

    I need to charge a Li Ion battery of 12.5 volts. How many panels are required to do so or approximately how many cells are required. What will be the power output from the panels

  20. Avatar for Yathindranath Yathindranath says:

    I have installed 15no. of 320Wp solar panels to run 5hp submersible pump.. but now i want to run 5hp monoblock pump with same solar panel… Suggest will it work and give ur precautions..
    Can i charge battery.. if yes.. what is capacity of the battery

    1. Avatar for Ben Zientara Ben Zientara says:

      Hi, Yathindranath-

      We’re going to give an expert electrician a chance to respond here, as this is a little outside our area of expertise. Good luck on your search!

  21. Avatar for Mehran Mehran says:

    I have a house with suite in the basement. I use electric heat for the basement and my electricity is very high, specially during the winter it’s close to 4,000 kWh per month. Can I use the solar system to cover that or at least part of it or it’s just not for me. We live in northern side with shorter days in the winter and longer days in the summer, and cold winter.

    1. Avatar for mike mike says:

      Priorities: 1. Lower heat transfer :: insulate walls with fiberglass R-11 to R-13 on wall, cover with sheet rock. 2. Cut infiltration losses – spray foam insulation in leaky windows, doors, gaps. 3. Reconsider electric heat; consider gas heat or solar hot water on roof to storage in basement if sunny in winter.

    2. Avatar for Andy Ferguson Andy Ferguson says:

      You didn’t mention what you use to heat water. If you use electricity you could consider purchasing a Sanden style ultra high efficiency CO2 heat pump water heater. If a big part of the electricity bill is heating water, this could dramatically reduce the monthly bill.

  22. Avatar for r burry r burry says:

    I think your numbers are wrong there. Going of the percentages the second generation is less than 3x as effecient. Yet on your wattage number you have it 10x. Something must be off, unless there is some solar concept I dont understand

    1. Avatar for Ben Zientara Ben Zientara says:

      Thanks for your comment. The reason the newer solar panels produce 10x more power despite the cells being only 3x as efficient has to do with how the cells were laid out on the panels of yore. If you look at old solar panels, you’ll see that the cells are round instead of mostly square, and they’re laid out in strings with the cells spaced a bit further apart. Modern cells are cut down to a square shape with small rounded corners,and placed very close together, which means more surface area of the panel is covered by the sun. This wasn’t clear in an earlier version of the page, but we’ve added some text to make this point clearer. Thanks!

  23. Avatar for T Satyanarayana T Satyanarayana says:

    Does the present solar panels convert heat energy also into electric energy under very hot conditions in places like North India using Peltier Modules. What are the technical and financial constraints.

  24. Avatar for Dan Dan says:

    I am using 3 electric pumps for irrigation of 65 hectares of land .Due to high electricity costs, I want to shift to solar energy. The power requirement for the 3 pumps are 160 , 76 and 200 kilowatts. Sunshine hours are an average of 7 to 8 hours per day. How many solar panels should i installed and what would be the estimated cost.Thanks

    1. Avatar for Ben Zientara Ben Zientara says:

      Dan-

      In that case, you’re going to need something interstitial between the panels and the pumps. Each pump will probably need its own solar pump inverter like this one, along with a tank into which to pump the water and a whole lot of panels.

      This is a bit above our pay-grade, and probably not going to be accurate, but at minimum input voltage of 150V, it seems like you’d need strings of 4 panels in series (48V per panel), and at 350 watts per panel, you’d need around 572 panels to put out enough electricity for just the 200-kW pump. That 200-kW solar array would probably cost you somewhere around $2/watt to get installed, so $400,000 before any tax credits or other incentives that may be available to you.

      All told, the 436-kW array you’d need would likely run you between $750k and $800k (USD), maybe. And keep in mind, that’s power output under full sun, so whenever it’s shady or the sun isn’t high in the sky, the pumps wouldn’t run (We guess. Not sure if those pumps can run at lower capacity under reduced electrical load). You could oversize your system, but if it was only hooked to the pumps, that’d be wasted generation when you didn’t need it.

      Again, we’re home solar guys, so this is beyond our expertise. I don’t know what requirements you’d face for hooking into the grid, getting new distribution lines built, etc. If you have other information you’d like to share, we’d be happy to take a look at it. The best way for us to help would be if you know exactly how many kWhs you need per year and the latitude/longitude of where you’d install the panels.

    2. Avatar for Jijo Pazhayattil Jijo Pazhayattil says:

      Are you sure about the kilowatt rating of the pumps you use? A 200KW pump is going to pump some serious volume of water!!!

  25. Avatar for gasper gasper says:

    more over, in the solar calculator page you refered to earlier, the dimensions in which standard? meter, inch, feet? all of them are mentioned so i wouldnt get a good figure there

  26. Avatar for gasper gasper says:

    hi, i have installed 4 x 250 panels, 4 x 200 amhr batteries, MPPT inverter/charger of kW, my consumption is 300 w more or less, and this is supporting the grid when its power goes off, so first question, 300 w on mppt panel means 300 x 3600 (seconds) to get W-hr? that would be way too high, please correctme

  27. Avatar for Mike Mike says:

    Assuming the solar panels in different years are the same sizes, then the efficiency calculations cannot make sense. If a 1954 panel was 6% efficient, whereas a 2012 panel was 15% efficient, then one would expect that the solar energy harvested would increase by a factor of 15% / 6%, i.e. 2.5. However, it varies by a factor of 10! (200W / 20W). Therefore some of the measurements cannot be correct. Similarly, the 2018 panel was 18.7% efficient, which, compared to the 2012 panel, is an increase by a factor of 1.2467. Therefore if the other numbers are correct the output of the 2018 panel can only be 250 Watts, which is far short of the 320 Watts shown. Certainly not a rounding error. I find it quite unlikely that the American Physics Society and National Renewable Energy Laboratory both have their numbers so very wrong. Please explain these incorrect numbers.

  28. Avatar for Alan Edwards Alan Edwards says:

    Although solar energy is one of the cleanest and most abundant renewable energy sources available, the space required to install solar systems can be a barrier to its implementation.

  29. Avatar for Anonymous Anonymous says:

    One GW in the Atacama desert in Photovoltaic is equivalent to GWh/year

  30. Avatar for mark mark says:

    wow, thanks Ben, for the information, much appreciated :). to spread the costs, can i buy, (for instance) a 5kw grid tied inverter, and start off with a couple of panels, then add more as i can afford them,

  31. Avatar for mark mark says:

    Hi all, hope you don’t mind me asking, as i now live in Spain, i have a total pertencia of 2.2kw and need to increase this, as i have no chance of doing so with the electricity company. i need a further 3kw to add to the 2.2kw i’m currently on, excuse my lack of knowledge in this field, but what inverter would i need to automatically use the solar first and grid power if needed after, and how many panels would i need please, many thanks, mark

    1. Avatar for Ben Zientara Ben Zientara says:

      Hi Mark-

      Most grid-tied inverters from the likes of Fronius, SolarEdge, SMA, and the like will ensure that your load is being served first from solar for as much as you need while the sun is shining, and second from grid power if you need more than your panels are making or if it’s dark. If, instead, you need to use ALL the solar energy in order to avoid a low feed-in tariff, for example, you need an energy storage system with a bank of batteries and a charge controller. In that case, you would likely be looking for an inverter/charger from companies like Outback or Magnum.

      Best of luck finding what you need!

  32. Avatar for KANNAN KANNAN says:

    How much solar cells needed for 375 watts

  33. Avatar for Alex Alex says:

    I don’t know if anyone is still around to answer this – fingers crossed – but here goes: I’m going to leave on a really long roadtrip next year with a minivan / SUV. I’m wondering if having one solar pannel on top, could provide me with enough power to charge a laptop and multiple digital camera batteries and my smartphone. that kind of thing. Thanks to anyone who might take the time to answer this.

  34. Avatar for Eliana Parker Eliana Parker says:

    Thanks for the Solar panel electricity efficiency. Now a days because of high technology its goes upto 65 inch=250 w. which is very goods. thanks for sharing all the detail with us.

  35. Avatar for Brad Brad says:

    I can explain my own experience designing a system, which I did in 2011. The system is now completely paid for, even though it was pricey, and obviously used older technology. Anyone planning a system today is lucky. First, a contractor recommended a system that was too small. He wanted me to have an affordable system. But I figured out I could have a more larger and more efficient system because THE INVERTER, which is necessary, could be replaced by two cheaper inverters if I had a slightly larger number of panels. So I did that. It was installed in three days. One day for scaffolding. One day for installation of the panels. One day to take down the scaffolding. It is an 8 kW system, approximately. My data for the last 7 years show that the panels are still at 99% of the capacity as the day they were installed. I live in a pretty cloudy and rainy place, so I generate about 1000-2000 kWh per kW of panels each year. The system finished paying for itself last month. I received no subsidy for installing it. It was a great decision.

    1. Avatar for Ben Zientara Ben Zientara says:

      Wow, Brad, that’s a great story! And 99% capacity after 7 years?! You’re definitely beating the averages, there. Really great to hear a good DIY story. Take care, and have a sunny day!

      -Ben

  36. Avatar for Brad Brad says:

    This seems like a good and useful site. The annual hours generated chart you show above is particularly useful. I think that this one main page can give anyone enough information to plan a simple system. Still, people seem confused. Maybe people are taking different paths to planning a system. Some want to know what they can POSSIBLY produce on their own roof. Others want to know a minimum system to supply their electricity needs. Others want to meet some financial constraint. That makes things a lot more complicated.

    1. Avatar for Aidan Sharples Aidan Sharples says:

      Hey brad, have you kept up on inverter tech?

  37. Avatar for vienna vienna says:

    hello.. can i ask for the reference/sources of this article? :) thank you

  38. Avatar for milo milo says:

    the Sunmetrix “buy or lease” calculator calculates the levelized cost ($/kWh). If solar doesn’t cover completely my house’s kWh (which come from the utility then) does the calculated levelized cost include this?

  39. Avatar for Jorge Jorge says:

    I use 4100 KW per month, my total roof area is 1800 SF, live in south beach Florida. I want to know the aprox cost to power my house entirely

    1. Avatar for Aidan Sharples Aidan Sharples says:

      How many lights you running bro?

  40. Avatar for milo milo says:

    1) No 2) Not practical 3)Battery loosing charge over time 4) Not clear 5)Yes, on sunny days

  41. Avatar for Kelsey S. Kelsey S. says:

    What date was this article written / updated?

    1. Avatar for Ben Zientara Ben Zientara says:

      Hi Kelsey, the last major update was in mid-2017. It’s due for some new info!

  42. Avatar for Ime Ibanga Ime Ibanga says:

    I am designing a ‘solar generator’ that could be used by micro businesses: 3(60 watt bulbs),Tv set, 2 shaving machines,and 2 pressing iron. How many panels are required. I live in Nigeria which lies within a high sunshine belt( equator). I also need a partner.

  43. Avatar for prasad prasad says:

    Wht happens when I try to set more charging current than the max current rating of solar panel?

  44. Avatar for The Mrs Crawford The Mrs Crawford says:

    I’m looking to semi off grid in northern Minnesota. From what my husband and mother in law says, winters the panels are pretty much useless because of the coverage of clouds. So I have of questions, and please excuse me if I sound a bit naive about this. 1) does the suns Ray’s shine through the clouds regardless of cloudy days or not to have energy hitting the panels? 2) is there a way to store up the energy other than a bank of batteries? 3) with the stored up energy in the batteries, how long does it last, if I dont use all the banked up energy, because even in a car when the alternator helps build up energy, if not used the battery does drain? 4) can I get a panel per room to be efficient in those areas. 5) my winter heat bill is astronomical like 400.00 a month, due to baseboard heating, and that is also using a second heat source, my propane fireplace. How can I use the panels to help in the winter?

  45. Avatar for Anonymous Anonymous says:

    First Tesla Solar Roof for Private Homes Now Operational

  46. Avatar for Anthony Anthony says:

    I have 12 panels at 195w each total 2340w. south face 30°.I have a monitoring system that shows and never exceeds 1500w generated even a peak sun hours. I feel as if the solar company has sold me a line of balony with the boost of 2340w . Why am I not getting somewhat closer to that 2340 number?can you respond via my e mail ?

  47. Avatar for L L says:

    Hi everyone. I wos curious to know the diferenced advantages and disandvantages of solar powe in confron with biomeiler or “compost heating .?

  48. Avatar for JoDa JoDa says:

    Great information. I stumbled across this trying to figure out why my system was producing a little less than a few days ago (from what I can gather it’s the heat…it’s been in the 90’s where last week it was in the 70’s), and it’s all good info! One thing I would note is that I think more efficient panels are becoming more common. Mine are 310 W, and that was the “cheaper” of the systems offered by my installers (total of 6.1 kW, the other option was just shy of 8 kW with the same number of panels (20)). What’s really cool is that you can now see your system’s production in real-time with the monitoring systems. Mine’s public page is here: https://enlighten.enphaseenergy.com/pv/public_systems/NJa41396469

  49. Avatar for Bobby Bobby says:

    How can we make our solar panels more efficient

  50. Avatar for Solar Panel Expert Guy Solar Panel Expert Guy says:

    I would like free advice on a comments board that no one monitors. I have 6 solar panels, 3 gerbils running on wheels, a stationary bike that powers a miniature TV, and a Lhasa Apso. So I guess my question is, how do President Trump’s personal moral shortcomings affect global Gluten Free muffin trade? Do you feel we headed towards a Gluten Free fueled trade war with Columbia?

    1. Avatar for Ben Zientara Ben Zientara says:

      Hey guy! I’m pretty sure we’ll be okay without gluten-free muffins. Do you have another question I can answer? Thanks!

  51. Avatar for Johan Smith Johan Smith says:

    It totally depends on your solar panels quantity, if you have much quantity of solar panels so they will produce more and more electricity every day. But that time you have to arrange batteries to store the electricity. But according to me, you should take the help of any good solar panel installation company for all this process.

  52. Avatar for Datta Shinde Datta Shinde says:

    how much electricity produce in 1 kw panel in 1day

  53. Avatar for Anonymous Anonymous says:

    why can’t i just getting a freaking straight uncomplicated answer

    1. Avatar for Ben Zientara Ben Zientara says:

      What’s the question?

  54. Avatar for SALAUDDIN SALAUDDIN says:

    hi , i am planning to start power charging station for multiple car charging at a time approx 50 cars at same time , fully automated system ground plus 1 storey structure 25 electric cars each floor parking slot for charging , day n night , please suggest what should be area requirement on roof top of the structure and what will be input of generation of energy to create electric watts .area of structure roof top to install solar panels approx 5000 square feet . REGARDS.

  55. Avatar for Bobby Bobby says:

    Want to gain knowledge of solar panel efficiency and wattage output

  56. Avatar for John John says:

    I have solar power installation of 250 watts by 8 solar panels. What is the capacity of Inverter required.

  57. Avatar for Anonymous Anonymous says:

    Help! My daily usage, based on what PSEG Long Island says, is 49kwh per day. During July and August, it will spike to into the 60s because of the A/C. This is about average for homes in this area, since most of them are second homes with pool equipment that run most of the summer daytime hours. I am not understanding the information above with the numbers Im seeing from PSEG. I have about 1000 square feet of usable roof surface for solar panels. What amount of energy can that generate?

    1. Avatar for Ben Zientara Ben Zientara says:

      Hey there-

      So from the calculator above, you can see 11.1 kilowatts (kW) of panels can fit on your 1,000 square-foot roof. That 11.1 kW is called the panel rating, and it represents the amount of power the panels can generate in full sun. The next part of the calculation is to take that 11.1 kW and multiply it by the map’s number for your area (1,500). 1,500 is the total number of kilowatt-hours (kWh) generated per kW of panel rating per year.

      So 1,500*11.1=16,650 kWh per year. But that number represents an ideal environment, and lots of things change how much of that power becomes usable. Electricity loss from wiring, DC-to-AC inversion, heat, cold, wet, etc can affect how the panels produce, so we usually assume about 20% of that ideal generation will be lost.

      So multiply the 16,650 per year by 80%, and you get 13,320.

      Divide that number by 365 days, and you get about 36.5 kWh per day, on average. Obviously, sunny days in summertime will lead to more generation, and cloudy, rainy, snowy days will lead to less, but the average will be about 36.5 kWh, or about 75% of your 49 kWh average.

      Hope that helps!

  58. Avatar for Mohamed Abdulhaq Mohamed Abdulhaq says:

    Hi…Can I have power using solar panels directly connected to an inverter without using batteries?? since I only need power for about 5 hours during the day. my power consumption is about 2.5 kw which requires about 12 panels of 260 watts each and maximum 4 to 5 kw inveter

  59. Avatar for Anonymous Anonymous says:

    I have a question. I am in Nunavut trying to build a mini solar panel for a science fair project. In total it is 54 volts and trying to generate 3 light bulbs in a parallel circuit. How long would it really take to light up the three light bulbs?

  60. Avatar for Imdad from Pakistan Imdad from Pakistan says:

    a system with: 1800 W (150 w each mono panel in shape of array 2*6); 24 volt battery bank (100 Ah each deep cycle, type lead acid, 4 batteries (2*2)); PWM charge controller; in present days in month of July, receiving 4 to 6 kwh in a clear day but mostly 5 kwh; at noon usually 1100 w, but once noticed 1295 w; do I suppose my system is working good or may I shift to MPPT charge controller?

  61. Avatar for Anonymous Anonymous says:

    Spelling and grammar matter people…if you want to be taken seriously.

  62. Avatar for elijah osiemo elijah osiemo says:

    wish to run mini bakery and need 50KW power supply . how many panels do i need to install and long can they last supplying effectively?

  63. Avatar for Rusty Rusty says:

    I have a 1.2 KW System in fun sun all day. The best I average is 2.5 KWh a day in Kansas and it runs a Frigidaire FFRE0533Q1 5,000 BTU airconditioner for about four hours. And my battery bank is four 100ahr agm. 24V system. Dont expect more than 550W peak from 12 100w panels. I have an eppsolar mpp controller.

  64. Avatar for bh bh says:

    I like to run off grid a small AC window unit 8,000 BTU, 120 V 15 AMPS. How many solar panels and batteries do I need?

  65. Avatar for Virendra kumar Virendra kumar says:

    I had installed 5400W solar panel with 5kW grid tied inverter. Our maximum power generation is limit to 3200W. we had installed 5400W panel. I think this is too low.

  66. Avatar for Anonymous Anonymous says:

    just wow

  67. Avatar for patel ashok patel ashok says:

    I am intrested to know, if solar panel can work on cloudy wather , is it possible that if i installe solar pannel on dack which is covered with glass roofroof to get sufficent sun light and at night with light which is normally on during the night time.

  68. Avatar for Ruwan Ruwan says:

    I have about 160 perch land. how meny solara panel install it. how meney power get it

  69. Avatar for Anonymous Anonymous says:

    I have 2500 watt,24 Volts solar panels- I want to know what is the current it produces

  70. Avatar for Jacobus Maximus Jacobus Maximus says:

    Ugh. I’m just looking for averages. If I have 1000 sq ft of “roof space” and want to put solar panels on my house, what am I looking at as far as cost savings? Ideally, the house would be completely powered by solar, but I know that won’t happen (since we live in Oregon and it rains 9 months out of the year,) but I want to know what the offset will be. Right now, living in an apartment, our electricity bill is about $60 a month. We can run our AC 24/7 when it’s hot as hell and our bill stays the same. But during the winter, we dress for base camp to hike Everest and it’s still like $80 per month. I want to live at a comfortable 65 degrees year round…

    1. Avatar for Ben Zientara Ben Zientara says:

      yo

  71. Avatar for Chico Escuala Chico Escuala says:

    The wattage rating you quote per panel is what is called “nameplate” power. It is the DC power as measured under perfect conditions at high noon on a cloudless sunny day at the PV panel DC ports. That power is diminished further by what is called the DC to AC “derate” factor. This factor typically diminishes power by 1/3. In other words solar companies are reluctant to tell you the actual available solar power at the AC outlets in your living room. This power is about 150 watts at the AC outlet where you plug in your appliances.Also solar energy will vary from day to day. This means you will see about 20 cents worth of power on a good day and about 2 cents on a poor day. Averaged over a year your total power output per panel will be about $35. The question now is: are solar panels worth the trouble and expense? You be the judge.

  72. Avatar for Nikhil Nikhil says:

    I need 2000 kWh per month , so how many pannels and how much area do i need.

  73. Avatar for S.R.BUILDERS S.R.BUILDERS says:

    WE ARE PLANNING FOR 1 MW SOLAR POWER PLANT. PLS GUIDE US HOW TO EXACTLY FIND A GOOD LOCATION WITH HIGH SOLAR RADATION IN OUR STATE OF ANDHRA PRADESH, INDIA.

    1. Avatar for Ben Zientara Ben Zientara says:

      Hello! The place you’re looking for has to have a few key factors:

      • No shade; so a low, relatively flat south- or west-facing hill with no trees surrounding it is ideal
      • Solid ground to mount the frames into
      • Some kind of transmission infrastructure built in the area, to get the power to the grid

      Good luck!

  74. Avatar for Zeidy Zeidy says:

    I live in Costa Rica and want to install an off grid solar power system to run a 220 deep well pump for approximately 4 to 5 hours per day. How do I know which panels inverter etc, I need?

  75. Avatar for Manish Kumar Manish Kumar says:

    I want to install a solar panel at my shop which need 3 KV power to run it. Roof area is 10ft x 10ft.

  76. Avatar for Jacek Jacek says:

    Hi, I’ve got a 50ft x 20ft southern facing sloped piece of land on the back end of my yard that is too steep to play on, but would probably make for a great Solar Farm site. If my local utilities company will rebate me $0.25/watt, what is my best course of action (type of panel, size of panel, number of panels, etc.) if I am willing to use that entire piece of land to make energy?

  77. Avatar for Jesse Jesse says:

    If your most effiecient panel produces 300 watts, how many kwh will it produce?

    1. Avatar for Ben Zientara Ben Zientara says:

      Hi Jesse-

      That depends on where you are in the world and how much shad you have. For example, an un-shaded 300W panel in New York City would produce about 1 kWh per day (averaged over the year), whereas the same panel in southern California would 1.25 kWh per day. We have a pretty neat calculator that you can use to test the production of solar panels at the bottom of this post: https://www.solarpowerrocks.com/square-feet-solar-roof/

  78. Avatar for nada ainiah nada ainiah says:

    which right way to connect the cell << parallel or series

  79. Avatar for Gaby Gaby says:

    How much sunlight is produced per year

  80. Avatar for Ramon Ramon says:

    How many solar panels would I need to get for an average of 2,078 KWH monthly?

  81. Avatar for Anonymous Anonymous says:

    It says how much a panel produces but like in what time period? So 200 kilowatts per hour or…??

    1. Avatar for Ben Zientara Ben Zientara says:

      The panel rating is basically the peak output at any given moment under laboratory test conditions. If a 200-kW panel was to generate its maximum output for an hour, it would equal 200 kWh, yes.

  82. Avatar for Ak Ak says:

    how much do I need solar panel and which size, if my electricity bills comes around 450kWh

  83. Avatar for douglas ryan douglas ryan says:

    How many MW can a 60KV line carry?

  84. Avatar for horu horu says:

    Can you give a rough idea, the required number of solar panel (with power capacity) for daily power consumption 2,400 KWh, for the location Rai, Sonepat, Haryana (India)

    1. Avatar for Ben Zientara Ben Zientara says:

      Hi, horu. If your site needs 2,400 kWh/day, you’re going to need a whole bunch of solar panels. Like more than 4,300. If it’s more like 2,400 kWh per year, you need about 12 solar panels. You can do some more calculations with our calculator located about halfway down this page: https://www.solarpowerrocks.com/square-feet-solar-roof/.

      Good luck!

  85. Avatar for Khan Khan says:

    Thanks for technical support .I am going to install a 100 kw On Grid solar system in Karachi which is Ideal for solar Energy. but could not get the actual performance of the system. means what will be the outcome in a day/week/year in kwh. Irradiation rate is 4 to 5 kwh/sq.meter/day

  86. What would someone need to power a three phase 50hp electric motor? I’m curious because i would like to try and power an oil well with solar panels.

  87. Avatar for salim salim says:

    question….how many solar pannels can be used to drive a DC motor of 75kw?

  88. Avatar for Ben Ben says:

    If my usage is 4966.92 kwh every month give or take whats the best ideal set up for me to power my whole house

  89. Avatar for Ross Ross says:

    power up a e-bike wheel if it takes 48v 50a. off power and have 10 panels that put out 24v 5a each and i run them 2 in sires and 5 in parall would this run the wheel????

  90. Avatar for Anonymous Anonymous says:

    Avgw panel 200 watts.. Harbor freight 15 wants what am I missing ?

  91. Avatar for Anonymous Anonymous says:

    I am trying to power individual growing towers for food. This requires that I have a sump pump at the bottom of the tower to pump the water up to 10 ft. The sump pump I have found to do this job uses 4 Amps @ 120V. The estimated G/Wh(gallons per watt hour) is 6.25. What kind of solar powering device could I use to power this growing tower off the grid?

    1. Avatar for Ben Zientara Ben Zientara says:

      Watts = volts x amps, so you need panels capable of putting out a continuous 480 W. That means you’d probably need at least 3 panels of around 180-200 W each (extra to compensate for losses due to wiring, etc.), plus microinverters. But they would only operate the pump when the sun was shining on them. You could add one of Tesla’s new Powerwall batteries for $3,000, plus a couple of extra panels to maximize capturing energy, but then you’d be looking at $10,000 just to power a pump.

  92. Avatar for Anonymous Anonymous says:

    Over a 12 month period, I use 14,500 kwh. How many solar panels I need to produce that much energy?

    1. Avatar for Ben Zientara Ben Zientara says:

      14,500 kWh is a little above average, but not too much. How much your panels produce really depends on where you live in the U.S. For example, on the east coast, you’d need a 12-kW system, which would mean about 54 panels, which would be about 740 square feet of roof space. In California, it would be more like a 10-kW system, or 45 panels taking up about 616 square feet.

      Really though, you don’t need to offset your entire usage with solar. Net metering from your electric company means you can have any sized system and see proportional savings.

      Hope that helps!

      -Ben

  93. Avatar for Anonymous Anonymous says:

    i use about 65,000 kw per month, how many panels would i need to have $0.00 elect bill.

  94. Avatar for Anonymous Anonymous says:

    Kiara says: my school is using 123,840kwh per month how many solar panels and should we get the 250 or the 350kw panels

  95. Avatar for Anonymous Anonymous says:

    will I qualify if my house uses 70kwh per month or more???

  96. Avatar for Anonymous Anonymous says:

    Guys ! no one here has answered a simple question , I calculated that each house on average in US uses 30KW a day , so the question is how many sq feet of PV panels do I need to install to suppy a full day of power for an average home (30kw)?

    1. Avatar for Ben Zientara Ben Zientara says:

      Hey there, friend. We have a page on our site that answers this exact question, with lots of good information about what it all means. Check out “How Many Square Feet do I Need for Solar Panels on my Roof?”

  97. Avatar for Anonymous Anonymous says:

    Has there been any changes in the duribility or storage capacity as it relates to batteries?

  98. Avatar for Anonymous Anonymous says:

    To the commentor stating that voltage is the correct unit for consideration: Voltage between two points is a measure of the potential energy a unit charge gains or loses between two points. The voltage function and electric fields can be gotten from one another. Thus, the voltage can be thought of as correlating to the strength of the electric field (I won’t go into the vector calculus of conservative force fields). “Power” is defined in physics as the rate of energy change, or time derivative of energy, however that energy is defined for a system. If E is energy, then power := dE/dt, that is the mathematics of the situation. So, while voltage is indeed a quantity you must consider, “power” has a specific definition in physics that is not as you describe it.

  99. Avatar for Anonymous Anonymous says:

    I read several posts here and I find that too many people are not asking the correct questions. When solar cells produce power you measure that power in voltage. Many different solar cells produce various volatges. This all depends on how many solar cells are “ganged together” A large solar cell can be a combination of voltages based on whether they’re wired in series or parallel.

  100. Avatar for Anonymous Anonymous says:

    Im trying to work out the plans for building a tiny house. It will be about 175sqft. With a roof pitch of 12/9. Im curious how many solar panels i will need, ir if it is even possible to power my home on just solar. I live in upstate Ny, and the home will have lights, efficient tankless h/w heater, 10cuft fridge, and electric stove top. Also some outlets for charging phones and things.

  101. Avatar for Anonymous Anonymous says:

    Will a 100w panel run a good size fan in my green house during the day i live in kentucky.

  102. Avatar for Anonymous Anonymous says:

    1.21 gigawatts? You know what that means? It means your stuck.

  103. Avatar for Anonymous Anonymous says:

    I want use one ton window air-conditioner at least for 10 hours long, and use iron box of 2000 watts and refrigerator of 300 watts for 24 hours and 20 cfl lamps for 6 hours long. How many solar panels do I need and how many batteries with how much ampere? Sun is available for 6 hours long. Can some one give information?

  104. Avatar for Anonymous Anonymous says:

    I have 350 watt solar panels and inverter 1500 watt 12v – 120v, can I run a small portable ac 1000 watt ? Do I need more solar panels? Please help, Thank you…

  105. Avatar for Anonymous Anonymous says:

    I live in india, I have four solar panels. Can I get enough juice out of them to power my tv?

  106. Avatar for Anonymous Anonymous says:

    We live in Dallas, Texas and have installed 29 panels facing south on our roof. I believe that they are 250 watt panels. How much energy will they produce in a month?

  107. Avatar for Anonymous Anonymous says:

    I have been visiting several websites and cannot find the answer to my question. I have a small house, 613 sq ft, I live in Costa Rica; so we gets lots of sunlight. My utility bill is around $35 a month. We do not have A/C, but am thinking of getting one and it would be European style. I use on average about 225 KWh per month. What type of system would I need? It’s hard to find a site that will let me factor in for living here. Thank you for helping me out.

  108. Avatar for Anonymous Anonymous says:

    Working on a time machine all I need is 1.21 gigawatts of electricity…

  109. Avatar for Anonymous Anonymous says:

    i require 3500 watt hour per day.. How many panels are required if sunlight hour here is 5. please reply fast

  110. Avatar for Anonymous Anonymous says:

    I,m getting 12 250 watt panels I use about 350 kwh a month is that enough

    1. Avatar for Patrick Kilhoffer Patrick Kilhoffer says:

      You are probably right at where you want to be. Assuming a 30 day month, you are using a little under 12 kilowatt/hours per day. (Congratulations by the way on minimizing your electricity demand!) A 3 kilowatt system will probably produce an average of about 15 kilowatt/hours per day. Obviously that will vary depending on if you are in Maine of Texas, but it’s a good rule of thumb. There will be some losses along the way from the inverter, wiring and so on so a 20% overproduction is about right. If you are in a northern state you might want to bump it up a bit if your goal is to produce 100% of your electricity, but here’s the thing: You can always add a few more panels. Having extra electricity production only makes sense if you are currently unhappy with the lifestyle that has gotten your usage so low, and you would welcome the opportunity to use a bit more electricity. For example, if you would like to add a window air conditioner, you would probably welcome a bit of extra electricity flowing through your wiring!

  111. Avatar for Anonymous Anonymous says:

    sir, i have 374w solar panel 1x200w 1x80w 2x37w and dirrectly connected to 150ah flat battery. but battery is not take full charge in a day is goes to 1150 as per hydromatter which is require 1250, regards Wasti

    1. Avatar for Patrick Kilhoffer Patrick Kilhoffer says:

      There are a couple of possible issues. It’s unlikely to be a problem with the panel, they are pretty foolproof, but it wouldn’t hurt to test the output and see if you are getting the amps you think you are. It’s more likely to be an issue with the battery. Batteries start with a ~95% efficiency but that can fall to 50% depending on the battery’s age and the usage. If I had to guess, based on the information provided, I would guess your battery has some sulfur from the sulfuric acid bonded to the battery plates, and that’s reducing the efficiency of the battery. You can buy a Battery Tender pretty cheaply online and hook the battery up until the light glows green and pulses. This may take a few days, depending on the condition of the battery. After that, you can use the Battery Tender periodically to maintain the battery. It’s possible the battery is too far gone, and you may need a new battery, if that’s the case, use the Battery Tender as often as you conveniently can to avoid damaging your new battery. In general, the best way to keep your battery happy is to keep it as charged as possible and to drain it as little as possible before recharging it. I hope that helps!

  112. Avatar for Anonymous Anonymous says:

    hello, if i want to fixed the numbers of panel is required to run some high powered electrical components like pump,fans(DC/AC) etc then which strategy or calculation i have to follow?

  113. Avatar for Anonymous Anonymous says:

    How much energy would 1,180 miles of solar panels produce opposed to the Keystone Pipeline?

  114. Avatar for Anonymous Anonymous says:

    can we set glasses in accordance of angle of reflection and merge the sunlight towards solar panel for more efficience of electricity

  115. Avatar for Anonymous Anonymous says:

    how can i calculate the amunt of power produced from a single pannel of solar energy

  116. Avatar for Chiremba E Chiremba E says:

    A useful analogy is the difference between speed and distance. Speed is distance travelled in unit time. Distance total distance travelled over the period in question. Similarly, power is energy delivered per unit time, usually per second. Power is measured in Watts or kiloWatts (thousands of watts). When a device delivers power at a rate of 1 kW continuously for one hour, the energy delivered in that hour is 1kWh. For 2 hours, it’s 2kWh. If instead the device was delivering 0.5kW for 5 hours for example, total energy delivered is 2.5kWh, being 0.5kW * 5h to give 2.5kWh. Hope this helps.

  117. Avatar for heem heem says:

    my country is very hot,can i use air condition 2000watt ? how long time can i use?

  118. Avatar for heem heem says:

    How much kilowatt my solar system will provide me monthly ?

  119. Avatar for Sam Sam says:

    Power is the amount of energy used per unit time. Thus Energy used is power * time. Thus ‘kilowatt hour’ is simply power in kilowatts * time in hours

  120. Avatar for Kati Kati says:

    So, on average, how much energy (in kilowatts) is produced an hour?

  121. Avatar for Bonzo Bonzo says:

    Please, differentiate between Kilowatts—which measure Power, and Kilowatt hours which measure Energy. Clearing this obfuscation will help people to make more intelligent decisions about the energy they use and hopefully produce

    1. Avatar for Evergreen Solar Evergreen Solar says:

      Best solar company in Kolkata West Bengal

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