Hello, I think after two years batteries are gone. It was set up and configured by company for my father, but was not monitored or serviced either. After he noticed often low voltage alarm he asked me for help, as the company is not reachable anymore.
There are 10x panels (AS-6P30-260W),
BlueSolar Charger MPPT 150/70 firmware 1.46
MultiPlus 48/3000/35-50 firmware 4.30
4x 12V victron 110Ah Gel batteries (in series)
I've studied something, purchased cables updated firmware, installed venusOS on raspberry, changed to ESS (before there was some Hub system - preventing feeding to grid - no allowed in my country) but still voltage drops very quickly and almost 90% usage is from AC grid even on sunny day, though usual load is between 200-600Watts, so I suspect inverter shuts down due low voltage very often.
I've read in this forum system is not able to run without batteries (he do no want to invest in new batteries anymore) question is, is it possible to set it up that way it will use as much solar power as possible even with such "dead" batteries, if yes what is the best configuration.
Or is Multi 48/3000 capable running with smaller voltage e.g. 12V or 24 ? I could try to isolate broken battery and try to set it up with remaining good ones, or maybe use spare 12V car battery if it's necessary for system to run