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Step 1 - Current Usage
Calculate the 12-month average energy usage by looking at your most recent energy bill. We are looking for the Average kWh per day, month, and year. These are calculated by measuring the difference in meter readings from one month to the next. A usage of 11.7 kWh per year or under requires a medium to large residential system. Anything over 11.7 kWh per year or over requires an extra large residential system. System size and design are also subject to roof material, size, and location.
Step 2 - Sun Score
Determine the level of sun exposure your roof gets on a daily basis. The direction, tilt, shading, and mounting surface are all critical factors when determining how many panels are needed to completely offset energy costs.
Panel Formula
A. Take your home's average monthly usage over the past 12 or 24 months.
(example: 1,000 kWh per month)
B. Divide that number by your roof's total monthly peak sun hours.
(5 hours a day times 30 days a month =
150 sun hours monthly in Tampa)
C. Multiply by the monthly kWh average.
(example: 11.7 kWh per year or 975 kWh per month)
D. Divide by the solar power rating (avg. 500)
E. Add +2 panels to account for efficiency and production discrepancy.
How many panels do you need?