December 23, 20241 yr For the past two weeks, I've been experiencing strange behavior on one of my strings connected to my Voltronic Axpert Max E 8K. I observe an unstable measured voltage of 60-70V with very low intensities by night This is the first time it has happened in 3 years, and I haven't changed anything. I have several theories, but I'm not sure if they are correct. Oxidation of the grounding connection contacts, but the other string should also be affected since it shares the same ground. Or the RC4 connector being in partial contact with the ground due to vegetation and its proximity to the soil, combined with the very high ambient humidity. Or the last hypothesis, a faulty panel on the string that, with the rain and humidity, is causing a malfunction. The contact with the chassis does not cause an electric shock, but I haven't measured the voltage between the ground and the chassis. No impact during the day and last night no voltage after taking off RC4 away from vegetation 2 days before If anyone had an idea ???
December 25, 20241 yr These inverters have high (hundreds of volts) AC waveforms between the PV inputs and earth, even at night, if the DC->AC converter is running. Your theories about leakage to earth could possibly explain it. If you isolate (disconnect) the PV panels, do you still see this measurement? If so, it's an inverter fault, possibly noisy or poorly soldered measurement resistors. But that doesn't explain the PV current measurements.
December 27, 20241 yr Author When panels disconnected, the measure remain to zero. Yesterday I check and clean up humidity with a dry clothe on cable and rc4 and this night the measure remain to zero like expected
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