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A 10 kW PV system produces 8 kW AC under STC.

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A 10 kW PV system produces 8 kW AC under STC. After one year, output drops to 7.2 kW. What is the most likely maintenance issue?

A.

Module degradation

B.

Soiling on modules

C.

Inverter inefficiency

D.

Loose connections

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