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# > Solar Power Calculator

This solar power calculator will, given the Watt rating of a solar panel, your solar panel location and your grid cost of electricity produce a table indicating the estimated solar powered energy you can expect to generate from an installed system in Winter and Summer, along with the calculated yearly average and equivalent costs of supplying the same electricity from the grid (or if your government operates a 'gross' feed-in residential tariff, put that in amount to see how much you get paid).

You can use this information to calculate the expected rate of cost saving or return when using solar power, or work out the number of solar panels you need for a given power load.

Values for the solar panel system 50 w is normal power
Tick if the mount tracks the Sun, leave unticked if fixed
Values for the location of the solar panel OR

Enter 0.1 if you do not know
Cost of 'grid' electricity or Recharge cost in cents for grid elec (or solar recharge/gross tariff)

Remember, what the solar power calculator determines for solar power output should be taken as a rough guide, it does not take into account other effects (like cloud cover, transmissions losses, building and tree shading, etc). It should therefore be considered a best case figure.

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• Shashi Verma said:

Hello, I am writing a research paper to estimate the PV array power output. Can you provide me the specs of a few of your panels and an equation to calculate the power output. I am located in Cupertino, California.

Thanks & Regards Shashi Verma

ON Fri, 20 Aug 10, 7:33am probably from India  Reply to this comment

• Syed Khaja Mohiddin said:

anybody suggest me what to do make my home completely operated by solar energy like fans, lights, ac, water pump, refrigerator.

ON Sat, 7 Jan 12, 8:33pm probably from Australia  Reply to this comment

• Martin said:

Can you calculate the capacity of solar panel needed to charge 12v 200Amp/h battery in 6hrs. I have 125 Watt solar panel so can it be charge my battery fully?

Thanks, Martin

ON Fri, 3 Feb 12, 5:03am probably from Australia  Reply to this comment

• Abdullah Al Ghaya said:

i am very thanks

ON Wed, 8 Feb 12, 4:31pm probably from Sudan  Reply to this comment

• B Ramachandra Rao said:

we are from India w'd like to have a 40kv solar pv system with 20 kv actual load and + 20kv to charge battery (will be used when power is not there during nights and cloudy wheather)ie 6-8 hrs solar charge and 16-18hrs battery supply.Kindly request help in assessing no of panels polysilicon 200w peak or 140w thin film modules and battery capacity to be provided. Regards B Ramachandra Rao

ON Tue, 28 Feb 12, 11:28am probably from Australia  Reply to this comment

• Abhilash said:

We have to select a solar panel for our Visiblity Sensor. Our region is Kuwait, we have to install the sensor in desert. Our sensor required 1A, 12V continously and 7A, 24V when heater is running. Could you please calculate the Watt and size of the solar panel and a suitable battery for our system.

Thank you, Best regards, Abhilash. N.R

ON Tue, 26 Jun 12, 4:34am probably from Kuwait  Reply to this comment

• Tahir Zaman said:

u require 40AH battery and 60 w panel for 1A 12vdc system and 1200 watt panel and 2x200AH batteries for 24vdc 7A for 24 hrs supply.

ON Thu, 6 Sep 12, 4:24am probably from Pakistan  Reply to this comment

• Baseer said:

can someone suggest how do i calculate the batteries and inverter required for a particular load, any standard formulas would be appreciated

ON Tue, 31 Jul 12, 8:24am probably from United Arab Emirates  Reply to this comment

• Andre said:

http://www.msguesthouse.co.za

ON Tue, 28 Aug 12, 11:53am probably from South Africa  Reply to this comment

sir, we are in kadambur, gangavalli, salem, tamil nadu, india. we want stable a small solar unit for housing purpose in 450w. 1) please send the details for the pannel detail,battery detail, inverter details. 2) onemore thing if already fix the battery, and inbverter for ups system from EB connection, it will use to this solar unit?

ON Fri, 26 Oct 12, 9:58am probably from India  Reply to this comment

• Errol Wenck said:

I think your site is brilliant! Could you please tell me on what modular rating your chart is calculated? My Modules are rated at 15.3%

ON Sun, 9 Dec 12, 1:13am probably from Australia  Reply to this comment

• Vutrc said:

We are likely to run an incubator of 800 watts. The machine will be running 24 hrs. What is the requirment of Solar panel, uPS and Battery

ON Fri, 21 Dec 12, 8:55am probably from India  Reply to this comment

• Joy King said:

Hi,

Will you please publish your equations? I'm a student and want to do a website similar to yours. If you please let me know your programming process I'll be grateful! thank you.

ON Thu, 10 Jan 13, 6:11pm probably from United States  Reply to this comment

• Jimmy Jinishian said:

hello, if i want to fully charge my 12V 800Amp/h batteries in just 4 hours what would be the wattage of my solar panels please? Thank you for your time.

ON Mon, 14 Jan 13, 8:01pm probably from Lebanon  Reply to this comment

ON Tue, 22 Jan 13, 5:54pm probably from Nigeria  Reply to this comment

• Elecengstudent said:

Power is measured in kW, Energy is measured in kWh! this calculator returns nonsense, use with caution!

ON Fri, 1 Feb 13, 1:54am probably from Australia  Reply to this comment

• Eco Guy said:

Hi Elecengstudent,

It returns how much power is generated in a given day - which is more meaningful to most people than just the ideal power generated in a given hour. Please read the results carefully.

ON Mon, 4 Feb 13, 7:57pm probably from Australia  Reply to this comment

• Ross said:

yeah but kw is already a time dependent value your value of "kw per day" means 1000 joules per, second per day...

you can only calculate how much actual energy in joules or kilowatt hours are generated in a day.

ON Thu, 16 May 13, 3:23am probably from Australia  Reply to this comment

• Petera said:

kw is not time dependent.

kw is 1000 watts, watts are voltage times amperage.

There is no time component.

kwh is how many kw are produced per hour;

This site lists "kw" produced in a given day; which means the site produces units of "kwd" (killo-watt-days). You could divide the number by 24 and you will get your daily "kilo-watt-hour" output of a system (averaged over the day). Remember this average will be much lower than the rating of the system, because it includes 12+ hours of nighttime (lowering your average substantially).

ON Wed, 5 Mar 14, 10:17am probably from Australia  Reply to this comment

• Christo said:

Hey everybody, I am new in this solar systems process applications and is interested residing the topic right as is it surely a defnitive alternative energy movement especcially with the risen cost of usable energy..for example I need to ask to complete my basic necessity as a starting point of view I want to determine the the power output (Watt) and rated output current of the solar panel to charge for example an 105Ahour battery for a determined time which I want to know..I saw a 80Watt , 4.69A current rated ooutput Solar panel..how long will it take to get the 105Ahour battery fully charged? The rest of calculations I can do and just one my starting stepping stones of the technology...thanks and regards..

ON Tue, 19 Mar 13, 9:25pm probably from United Kingdom  Reply to this comment

• Michael said:

Hi everyone!

we are students who are writing business plan about installing solar panels on the roof of the hotel in Tenerife (Canarian Islands) Spain. The capacity of the roof is 300m2 and 1kw cost is 0.15 euro cent. And we need to calculate how much hotel could safe on electricity and water heating by installing. Any ideas can this link help us? Thank you very much in advance!!!

ON Thu, 28 Mar 13, 2:06pm probably from Denmark  Reply to this comment

• Duncan Elvis said:

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ON Fri, 15 Nov 13, 6:39am probably from Australia  Reply to this comment

• Sunil said:

Dear sir,

We installed a small solar panel plant 15KW in rajkot (Gujarat)India . In summer it can be provided me 14kw output but in winter can provided me only 11KW output on peak.

We found a big difference in generation in this.

Thanks Sunil

ON Sun, 8 Dec 13, 8:24am probably from India  Reply to this comment

• Petera said:

Chances are the angle of the sun.

During winter the sun is lower (closer to the horizon).

Solar panels generate electricity best when looking straight at the sun - in winter the sun is lower and so even at midday in winter it isn't looking "straight" at the sun. (it is pointing too high).

Also over time the panels can get covered in dust, and may require cleaning. Check how to clean your panels.

ON Wed, 5 Mar 14, 10:23am probably from Australia  Reply to this comment

• Ace said:

12 multiplied by 0.8 means 9600 W total capacity of the battery bank. If you want to charge from 0 to 100% in 4 hours you need 9600w divided by 4 system, witch means 2400 W solar panel system. If You want to charge in 4 hours from 50% to 100%, you need 1700 W solar panel system. To prolong the life of the batteries, it is strongly recommended to not discharge them below 50%.

ON Mon, 28 Apr 14, 2:11pm probably from France  Reply to this comment

• Lucille Collins said:

it really good have solar panel. It is really a good thing we installed solar panels it help us to save energy. We really get this on affordable solar panel prices.

Thanks for the information It really helps me a lot.

ON Wed, 24 Sep 14, 2:11pm probably from Philippines  Reply to this comment

• Raghavan said:

Hi, what is the area of solar panel used to provide the values in the above table, based on the area I can calculate the nos. of such solar panels that can be provided for a given roof area and subsequently total possible power generation. And also what is the voltage of the panels considered w.r.t the above tables.

ON Tue, 14 Oct 14, 6:08am probably from India  Reply to this comment

• Sotirios said:

Hi, I think there is a typo in the table. What it calculates is not the maximum power, but the maximum energy delivered per day (i.e. power x time). Other than that, it looks pretty neat and a useful tool! Thank you!

ON Mon, 15 Dec 14, 12:54pm probably from United Kingdom  Reply to this comment

• Shane said:

Hi, I was wondering where you get the solar insolation data (number of sun hours) from? You seem to produce calculations (e.g.. Bay of Plenty, NZ) but I can't find this data listed anywhere online. I would appreciate knowing how you access this data. Thanks

ON Sat, 27 Dec 14, 11:43pm probably from Netherlands  Reply to this comment

• Claudio Aulong said:

What would be the average power potential in watts for a 20W panel using a12V 40ah battery?

ON Sun, 28 Dec 14, 10:08am probably from Australia  Reply to this comment

• Gerrie said:

I have the following system that I use only for my lights. But it only last up to maximum of 1 - 3 hrs. Then it shuts off. 2 x 150 watt 12 PV panels on the roof connect in parallel. 1 x 20amp -12v - regulator. 2 x 65 amp/h batteries connect in parallel. This feeds a 12volt -1000 watt modified sine invertor. Which feeds my lights distribution board with only my lights. I have changed all the globes in my house to LED globes. The total watts of all the ligths when switch on is 496 watts. The maximum watts I use is 250watts for 3 hrs combined. What can I do to increase the time on the system output? I want at least 250watt for 5 hrs. Do I crease the batteries or the panels? Please assist.

ON Sun, 7 Jun 15, 9:05am probably from South Africa  Reply to this comment

• Carlos said:

Hi I have a project to make in my mind and I would like to know if someone can give me an advice to make it. What I want to do is create a circuit with a LED bulb(5050 SMD 18 LED Bulb 12 V 5W max.) and I need this Bulb connected, steady light, at least 16 Hours per day, daily. I need a solar panel, and a battery to feed this Bulb, too. So, Dear Friends, what would be necessary to do my project (what would be is: the required solar panel; The required Battery; and a controller as well). If someone could help me out with this issue I will be grateful. Thanks. Best Regards Carlos

ON Fri, 28 Aug 15, 2:11pm probably from Romania  Reply to this comment

• Charles said:

ON Wed, 25 Nov 15, 11:58am probably from Australia  Reply to this comment

• 1500kva said:

I need 1500kva

ON Thu, 14 Jan 16, 12:45am probably from Nepal  Reply to this comment

Does this take into consideration the efficiency of a typical solar panel?

ON Tue, 16 Feb 16, 5:17pm probably from Ireland  Reply to this comment

• Jy said:

we are onto a project and we want the formulae for calculating the amount of electricity produced i.e. the solar power calculator,we will be glad if you help us by providing the same.

ON Thu, 12 May 16, 9:05am probably from India  Reply to this comment

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