Solar array
Enter your energy use. Results update live.
Panels needed
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Enter your daily energy use to size the array.
Size a solar panel array from daily energy use and peak sun hours, with panel count and total wattage.
Enter your energy use. Results update live.
Enter your daily energy use to size the array.
Daily energy in watt hours is divided by the energy one panel produces per day, which is panel wattage times peak sun hours times a real world derate of 80 percent. The result rounds up because you cannot install part of a panel, so small systems often end up slightly oversized.
Peak sun hours measure the day's total solar energy as equivalent hours of full 1,000 W per square meter sun. Five peak sun hours does not mean five hours of daylight; most locations get 3 to 6 depending on latitude, season and cloud cover.