Assume that electricity can be generated from the sunlight for 8 hours per day.
In a sunny location, sunlight has a power density of about 1kW/m^2 . Photovoltaic solar cells can convert this power into electricity with 16% efficiency.
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{ 2 comments… read them below or add one }
alot
If you can convert at 16% efficiency, then You only get 160 watts per square meter. Multiplied by 8 hours = 1280 watt/hours per square meter. Multiplied by 30 days = 38400 watt/hours per square meter, or 38.4kWh per square meter.
390 / 38.4 = 10.15625 square meters of solar cells.