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Answer :
Final answer:
To safely clean or replace a fan in a Sunny Boy 3000 US inverter, open all DC and AC disconnects and wait for 20 minutes to allow residual voltage to dissipate. Therefore correct option d. 20 minutes
Explanation:
Cleaning or replacing a fan in a Sunny Boy 3000 US inverter requires all DC and AC disconnects to be opened. The recommended time to allow residual voltage to dissipate before maintenance is 20 minutes. This ensures safety and prevents potential electrical hazards.
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