Is it possible to force a MultiPlus-II GX to startup even in case of a VE.bus error #8 (ground relay test failed), or better, to raise the tolerance ? Before the usual "it's dangerous" advices start coming, allow me to contextualize.
I have fitted my house with a Multiplus-II GX with a PV array + battery storage working in ESS mode. Works well, a bit undersized though (I'll add some battery soon). I live in Corsica where we have frequent mains shortage in winter. My house is 30 years old and in spite of having partly rewired it anew, there are still parts of the installation that intermittently provoke a ground relay test failure on the Multiplus when it starts up. It is possible that these wires' insulation has eroded, or (as I rather suspect) have received sustained electrical overload by the former owner. Unfortunately these are the wires that are the harder to replace. I could isolate the cause of the problem to 3 circuits and their ground relay test failure is not systematic. Yet, the electrical installation has been verified by the legal diagnosis when the house was bought and was found "safety compliant" - for what it's worth.
It's being pretty much a hassle to wake up in the middle of the night after a power failure to cut the involved loads, shut down the Multiplus, turn it back on and wait 5 minutes for it to initialize and clear the VE.bus error #8, then turn the loads back up again and return to bed. Is there a way to raise the sensitivity of this trigger, or even to disable it completely ? I take full responsibility.
I am a good engineer and programmer, I already modified the Venus web interface to display in portrait mode on my orientation-locked phone, have installed a host compiler on the nanopi and brought a patched-up Midnight Commander of mine, and am starting to scour the root filesystem of the nanopi for the places where this next issue could be treated. I'm not afraid of putting a binary in IDA and patching some bytes if necessary, but I sure hope there's a much simpler solution for my problem.
Could a Victron engineer or a knowledgeable person hint me where to look for ? Thanks in advance