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A silicon solar cell array works at an efficiency of 8.1% in sunlight and is exposed to an average solar insol?

Sep 08, 2010 by LeoLeo | Posted in Engineering

A silicon solar cell array works at an efficiency of 8.1% in sunlight and is exposed to an usual solar insolation of 230 Wm-2. If the array recoups the energy cost in 8 years, add up the energy required to fabricate the solar cells (answer in MJ/m2).

That norm insolation value is low enough that it's probably averaged over a 24-hour period already.

So I would do

3600 seconds / hour * 24 hours / day * 365 days / year * 8 years * 230 W/m^2 * 8.