How do you calculate the solar system capacity?

Energy production from a solar electric (PV) system is a function of several factors, including the following. Our assumptions are shown:

Solar resources Assumed solar availability: As per PV Watts
Soiling or contamination of the PV panels Clean, washed frequently: 98% design sunlight transmission
Temperature 25C, calm wind
System configuration (battery or non-battery) Non-battery
Orientation to the sun tilted at your latitude, South facing
Shading None
PV Energy delivered as % of manufacturer`s rating 95%
Wiring & power point tracking losses 9% (91% delivered)
Inverter Efficiency 90%
Total Energy Delivered 95% x 91% x 90% = 78%


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