I have been asked to solve a opoorly installed offgrid set up with a Multiplus 48/5KVA, 4 x US2000C type Pylontech batteries (actually rebranded TAB), a 250/85 MPPT and a Color Control.
The MP was not configured and thus charging to lead acid levels (57v etc) and the batteries giving alarms and switching the system off. I have corected the configs and ordered a wifi dongle to connect to their router however and will connect that Monday (when they let me go back), however;
How do I check the state of health of these batteries? I suspect they've been overcharged and may be damaged. They do complain about running out of battery power since a month ago or so (Spain so days getting longer here).
Thanks in advance!