Your guide to being Eco Friendly & Sustainable

# > Solar Power Calculator - calculate generated power

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 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 and 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, the values calculated here for solar power production 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 be considered a best case figure.

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### Related Tags..

• 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, 5:33pm 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 Sun, 8 Jan 12, 7:33am 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, 4:03pm probably from Australia  Reply to this comment

• Abdullah Al Ghaya said:

i am very thanks

ON Thu, 9 Feb 12, 3:31am 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, 10:28pm 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, 2:34pm 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, 2:24pm 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, 6:24pm probably from United Arab Emirates  Reply to this comment

• Andre said:

http://www.msguesthouse.co.za

ON Tue, 28 Aug 12, 9:53pm 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, 8:58pm 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, 12:13pm 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, 7:55pm 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 Fri, 11 Jan 13, 5:11am 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 Tue, 15 Jan 13, 7:01am probably from Lebanon  Reply to this comment

ON Wed, 23 Jan 13, 4:54am 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, 12:54pm 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 Tue, 5 Feb 13, 6:57am 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, 1:23pm 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, 9:17pm 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 Wed, 20 Mar 13, 8:25am 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 Fri, 29 Mar 13, 1:06am probably from Denmark  Reply to this comment

• Duncan Elvis said:

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ON Fri, 15 Nov 13, 5:39pm 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, 7:24pm 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, 9:23pm probably from Australia  Reply to this comment