Calculate How Much Solar

Calculate How Much Solar

First, you need to know the power consumption for the property. You can find this using the power bills for 12 months. Add the monthly kilo-watt hours (kWh) for an annual total. If you don't have power bills, there are other ways to create an estimate. Order the solar design service and we can help. Once you know the kWh desired, use the calculator here to determine the kilo-watts (kW) of solar power you will need to generate kWh.

Solar Power Calculator 

1. Enter the kWh used per year:         
2. Find the Solar Hours per Day (see map below)          
3. Enter the % of Electricity Bill you want to cover          
4. Click Calculate        
 
5. This is the Solar Array Size in kW          

The NEXT STEP, now that you have an estimate for the desired kW, VIEW SOLAR KIT SIZES to compare prices, brands and options.

Remember, you decide how much solar to get based on the need, available space and budget. There is no rule that you have to offset 100% of current energy use. Utilities will generally allow grid-connected systems up to 120% of the previous 12 months consumption. They will also allow for consumption increases from an electric vehicle, home expansion or other needs.  


Solar Power Map of the United States

Find your Solar Hours per Day using the color-coding on this map. Enter the value for your location into the solar calculator.

solar-radiation-map of the USA

The solar map uses insolation, a measure of solar radiation energy received on a given surface area in a given time. This is typically measured in kilo-watt hours per square meter per day (kWh/m2/day). The map shows the average daily total solar radiation throughout the United States. The U.S. Department of Energy, National Renewable Energy Laboratory (NREL) developed it.