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We've had a simple solar hot water system for about 6 months now and it was working fine in that time but just recently it's not turning the pump on when it's reaching the cut-in temperature. Also, placing your hand on the top-right of the unit you can feel that some component in there is...

A guy I found on YouTube once repaired relays on solar inverter, they were not clicking on for some reason so he opened the relays up and bent the connections until they came on easily. He then set it up with fake loads as if it was in a working solar array/system and he showed that they would...