I'm new to solar stuff. Is this common that the BMS would fry upon reconnecting the PV in bright sunlight, or is it the SCC that would fry? I'm assuming the issue is overvoltage?if you reconnect the PV in bright sunlight, you will fry the BMS
Edit: Never mind... I see in Miles' scenario that the SCC's FETs are already shorted closed, which would then connect the PV panel high voltage back to the BMS in bright sunlight. (e.g. Not the accidental trip that codfish referred to)
I think an Arduino could detect an SCC failure, disconnect a HV panel relay/contactor and trigger an alarm, instead of reconnecting the PV panel and frying the BMS. Adding software control to the failsafe allows a variety of possibilities.
Also, in searching about the SCC frying (which also appears to be the original problem of this thread), I found this:
Trying to destory my SCC's: I can't do it!
So I took every EPEver/Victron/PWM/Renogy solar charge controller, and tried to fry it by connecting it only to solar panels, and not to a battery... guess which one survived? EVERY SINGLE ONE! I couldn't destroy any of them, and I left them connected to a high voltage array (80 volts) for 4+...
diysolarforum.com
Anything can fail... Are we flogging a dead horse here?
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