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Is there typically voltage on a line at night, even residual? Is starlight enough to create voltage. There was only 90W being generated yesterday so the current was low but the voltage was still high.

Just finished a pv system and found that we didn't have power on one of two strings when we started the inverter. Traced our cables back and found one of the mc4 connectors on the feed in to the fireman switch from the panels wasn't making for some reason. Need to swap out the MC4 connectors and...