Hello,
I have an Easysolar II with a pair of 50Ah Pylontech batteries on a boat (https://vrm.victronenergy.com/installation/72568).
Everything was working fine last year, we spent winter directly connected to the shore, but this year I get a weird behavior, which doesn't seem fixed even after updating every Victron firmware: The MPPT seems to throttle the PV input, as if the batteries were full, although they aren't. Even when I draw several kW from the batteries through the 230VAC output, the MPPT still won't accept any signigicant current.
The panels are 2 strings of 6 400W Trinasolar, and they're clearly pushed past their MPP at around 38V per panel (https://static.trinasolar.com/sites/default/files/EN_Datasheet_Vertex_DE09.pdf):
The MPPT indicates it's under external control, I guess from the Pylontech BMS through the Cerbo—I've forgotten som eof the setup details. It keeps its "Absorbption" yellow LED on, although I don't know whether it means anything under external control.
Other things I've tried to figure it out:
- Switching the master/slave roles of the Pylontech batteries doesn't help;
- Shorting the PV panels at the end of the cable, where they normally connect to the Easysolar, passes a normal amount of current (several amps, I'm not docked under direct sunlight;
- Voltage reading from the Easysolar seem accurate within 1%;
- Battery charging from shore through the Multiplus work fine.
I don't know where to look next :-(