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Sun-Hours Per Day

This table shows solar insolation in kilowatt hours per square meter per day in many U.S. locations. For simplicity, we call this figure "sun-hours per day." To find average sun-hours per day in your area, check local weather data, look at the map on the next page, or find a city in the table below that has similar weather to your location. If you want year-round autonomy, use the low figure. If you want only 100% autonomy in summer, use the high number. If you want a utility grid-tie system, and you have net metering available in your state, use the average figures. For off-grid systems, see U.S. insolation map on the next page.

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