Question: Assuming a silicon PV array attains 20% efficiency over a lifetime of 25 years of use, where it is exposed to an average of 250

Assuming a silicon PV array attains 20% efficiency over a lifetime of 25 years of use, where it is exposed to an average of 250 W/m², what is the total energy output of 1 m² of PV cells (in joules). What quantity of coal would it replace (at 33% net efficiency)?

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