The altE Off-Grid Solar Panel System Calculator helps you size the battery bank, watts of solar panels and the solar charge controller you need. The calculator assumes you will need to size your system to get you through average amount of sun-light in the least sunniest month of the year for your location. You still may want to consider a backup generator, however. Feel free to call our knowledgeable technical sales staff toll free at and have them help you find the system that fits your needs.
This value is usually printed on your electric bill. Take your monthly kilowatt-hour usage from your electric bill and divide it by 30 to get your daily kilowatt-hour usage. Since it's in kilowatt (1000's of watts) you'll need to multiply that number by 1000 to get the number into watt-hours. If you don't have a bill, or don't know your consumption, please use our Load Calculator to go through the steps to determine this value.
Is your energy usage too high? Don't despair, our knowledgeable sales folks can help you find other potential solutions. Please call us toll free at: = ALTE_800_NUMBER ?> .
How many days of backup power do you want in case of cloudy/rainy days?
(when your solar panels will produce little energy)
What is the lowest temperature your battery bank will experience?
You need to determine the average number of sun-hours per day during the least sunniest month of the year (not the whole year).
The total wattage of Solar Panels that you need is:Watts, or kilowatts
How many solar panels do you need? That depends on the panel you choose.
Select the wattage of the panel your interested in, and see the results below:
watts per panel.
You will need panels for a total of watts.
Select the solar panel that fits your needs.
You will need a charge controller that can handle:
Select the solar charge controller that fits your needs
Sizing a charge controller can be complex, the above answer is a conservative estimate. Please feel free to call us to find a more accurate fit for your needs.
Now that you have sized up the system that fits your needs, call our Knowledgeable Sales Folks at and let them help you find the exact products for your system.
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