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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

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Roger Ward
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Roger Ward

How much do soloar panels (and supporting frames weigh?

Diogo Sá
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Diogo Sá

Thanks from Portugal! Accurate and simple explanation!

Molly Anderson
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Molly Anderson

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?

Howard
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Howard

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?

bgtv
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bgtv

You only talk about monocrystal
solar cells

emma
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emma

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

YASH KUMAR
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YASH KUMAR

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.

Bob
Guest
Bob

Hey guys

Vanessa
Guest
Vanessa

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!!

Steve Fischer
Guest
Steve Fischer

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).

Kenneth
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Kenneth

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.

john travira
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john travira

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

Ed Kaufholz
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Ed Kaufholz

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!

Ayam
Guest
Ayam

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

Qamar
Guest
Qamar

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

No Thanks
Guest
No Thanks

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

Gary
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Gary

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

N Sai Abhiram
Guest
N Sai Abhiram

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

Yathindranath
Guest
Yathindranath

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

Mehran
Guest
Mehran

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.

mike
Guest

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.

Andy Ferguson
Guest
Andy Ferguson

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.

r burry
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r burry

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

T Satyanarayana
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T Satyanarayana

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.

Dan
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Dan

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

Jijo Pazhayattil
Guest
Jijo Pazhayattil

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

gasper
Guest
gasper

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

gasper
Guest
gasper

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

Mike
Guest
Mike

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… Read more »

Alan Edwards
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Alan Edwards

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.

Anonymous
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Anonymous

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

mark
Guest
mark

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,

mark
Guest
mark

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

KANNAN
Guest
KANNAN

How much solar cells needed for 375 watts

Alex
Guest
Alex

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.

Ronnie
Guest
Ronnie

Yes.

Eliana Parker
Guest
Eliana Parker

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.

Brad
Guest
Brad

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… Read more »

Brad
Guest
Brad

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.

Aidan Sharples
Guest
Aidan Sharples

Hey brad, have you kept up on inverter tech?

Jack
Guest
Jack

yes

vienna
Guest
vienna

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

milo
Guest
milo

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?

Jorge
Guest
Jorge

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

Aidan Sharples
Guest
Aidan Sharples

How many lights you running bro?

milo
Guest
milo

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

Kelsey S.
Guest
Kelsey S.

What date was this article written / updated?

Ime Ibanga
Guest
Ime Ibanga

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.

prasad
Guest
prasad

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

The Mrs Crawford
Guest
The Mrs Crawford

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… Read more »

Anonymous
Guest
Anonymous

First Tesla Solar Roof for Private Homes Now Operational

Anthony
Guest
Anthony

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 ?

L
Guest
L

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

JoDa
Guest
JoDa

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)).… Read more »

Bobby
Guest
Bobby

How can we make our solar panels more efficient

Solar Panel Expert Guy
Guest
Solar Panel Expert Guy

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?

Johan Smith
Guest
Johan Smith

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.

Datta Shinde
Guest
Datta Shinde

how much electricity produce in 1 kw panel in 1day

Anonymous
Guest
Anonymous

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

SALAUDDIN
Guest
SALAUDDIN

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.

Bobby
Guest
Bobby

Want to gain knowledge of solar panel efficiency and wattage output

John
Guest
John

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

Anonymous
Guest
Anonymous

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?

Mohamed Abdulhaq
Guest
Mohamed Abdulhaq

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

Anonymous
Guest
Anonymous

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?

Imdad from Pakistan
Guest
Imdad from Pakistan

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?

Anonymous
Guest
Anonymous

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

elijah osiemo
Guest
elijah osiemo

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?

Rusty
Guest
Rusty

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.

bh
Guest
bh

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?

Virendra kumar
Guest
Virendra kumar

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.

Anonymous
Guest
Anonymous

just wow

patel ashok
Guest
patel ashok

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.

Ruwan
Guest
Ruwan

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

Anonymous
Guest
Anonymous

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

Jacobus Maximus
Guest
Jacobus Maximus

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… Read more »

Anonymous
Guest
Anonymous

hi

Chico Escuala
Guest
Chico Escuala

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… Read more »

Nikhil
Guest
Nikhil

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

S.R.BUILDERS
Guest
S.R.BUILDERS

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.

Zeidy
Guest
Zeidy

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?

Manish Kumar
Guest
Manish Kumar

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

Jacek
Guest
Jacek

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?

Jesse
Guest
Jesse

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

nada ainiah
Guest
nada ainiah

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

Gaby
Guest
Gaby

How much sunlight is produced per year

Ramon
Guest
Ramon

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

Anonymous
Guest
Anonymous

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

Ak
Guest
Ak

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

douglas ryan
Guest
douglas ryan

How many MW can a 60KV line carry?

horu
Guest
horu

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)

Khan
Guest
Khan

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

mathew.stoddart@ca.weatherford.com
Guest

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.

salim
Guest
salim

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

Ben
Guest
Ben

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

Ross
Guest
Ross

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????

Anonymous
Guest
Anonymous

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

Anonymous
Guest
Anonymous

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?

Anonymous
Guest
Anonymous

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

Anonymous
Guest
Anonymous

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

Anonymous
Guest
Anonymous

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

Anonymous
Guest
Anonymous

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

Anonymous
Guest
Anonymous

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)?

Anonymous
Guest
Anonymous

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

Anonymous
Guest
Anonymous

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… Read more »

Anonymous
Guest
Anonymous

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.

Anonymous
Guest
Anonymous

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.

Anonymous
Guest
Anonymous

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

Anonymous
Guest
Anonymous

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

Anonymous
Guest
Anonymous

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?

Anonymous
Guest
Anonymous

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…

Anonymous
Guest
Anonymous

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

Anonymous
Guest
Anonymous

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?

Anonymous
Guest
Anonymous

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.

Anonymous
Guest
Anonymous

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

Anonymous
Guest
Anonymous

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

Anonymous
Guest
Anonymous

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

Patrick Kilhoffer
Guest
Patrick Kilhoffer

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… Read more »

Anonymous
Guest
Anonymous

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

Patrick Kilhoffer
Guest
Patrick Kilhoffer

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… Read more »

Anonymous
Guest
Anonymous

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?

Anonymous
Guest
Anonymous

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

Anonymous
Guest
Anonymous

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

Anonymous
Guest
Anonymous

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

Chiremba E
Guest
Chiremba E

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… Read more »

heem
Guest
heem

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

heem
Guest
heem

How much kilowatt my solar system will provide me monthly ?

Sam
Guest
Sam

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

Kati
Guest
Kati

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

Bonzo
Guest
Bonzo

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

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