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Quote from: aaapilot on May 03, 2024, 09:49:24 AMI've had an intermittent Ground Fault, aprox 5 times in 2.5 months since the system was installed. It occurs either when the sun is setting or early in the morning just before sunrise. (At least, that's what I'm guessing since it's ok at 10pm and light on at 7:30-8:00 am when I check on the system.) Yesterday it occurred and the PV breaker was OFF on the HB. Is that even possible for the system to detect a ground fault when there is no load on the PV? (There IS a Surge Protector at the combiner box, so are the 2 LEDs on the SP considered a load??) I'm beginning to think the Ground Fault circuit sub-board is faulty .... it is one of the original builds that have the D2 RED LED. Incidentally, the system does NOT shut down when the GF occurs. Just the red lite on the display w/ the words 'a ground fault has occurred'. When I press the knob to clear, when there is PV connected and on, the MPPT is still running and producing power. I thought the system would stop and had to be reset? I have removed the front cover to check the board when it occurs, before I clear the message on the screen, and the D2 RED LED is flashing quickly, showing normal ops? The D1 RED LED has never illuminated, which is suppose to be on solid when a GF is present. Thanks all. Dave
Quote from: ClassicCrazy on May 07, 2024, 03:45:05 PMI bypass the pv input around the controller to the resistance heater load. An SSR or DC contactor can be used to switch the PV input. I use a contactor now with it just being on off controlled by Aux . But I guess it could be pwm using a ssr or igbt depending on pv voltage.
Larry