Assuming a silicon P V array attains 20 efficiency over a lifetime of 25 years of use, where it is exposed to an average of 250 W m 2 , what is the total energy output of 1 m 2 of PV cells (in joules) What quantity of coal would it replace (at 33 net efficiency) ...

At 20 efficiency 1 m 2 of solar cells expose ...

Assuming a silicon P V array attains 20% efficiency over a lifetime of 25 years of use,

Question:

Assuming a silicon P V 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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