![]() The solar hours per day for your location.Your utility power bill for the last 12 months.To estimate your solar system size, you will need three pieces of information to calculate the solar kilowatts. On our Calculate How Much Solar page, you will learn how much solar power in kilo-watts or kW is needed to generate the kilo-watt hours or kWh of energy used at your property. ![]() Steps to calculate how much solar you needĪt SunWatts, we make solar simple, and calculating how much solar you need has never been easier. Department of Energy, National Renewable Energy Laboratory (NREL) developed it. The map shows the average daily total solar radiation throughout the United States. This is typically measured in kilo-watt hours per square meter per day (kWh/m2/day). The solar map uses insolation, a measure of solar radiation energy received on a given surface area in a given time. Enter the value for your location into the solar calculator.
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