Hello. I did search to see if there were posts about my issue but no answers were a close match. I have a bank of 10 x Pylontech US3000C batteries. I am off-grid and only charge the batteries with solar. Recently I have been getting fleeting high volt alarms from (I assume) the Pylontech BMS. These display on my Cerbo console and last for between 30 and 50 seconds and then return to normal.
These alarms occur when the state of charge is higher than 98% and the MPPT chargers are really cranking. This morning my MPPTs were providing 10kW, with 3.5kW going to a hot water service and the remainder to the batteries. As the SOC ticked over 98% the supply to the batteries did start to reduce, but not quickly enough to prevent the high volt alarm. When the high volt alarm came up I could see that the system was still pushing more than 3.5kW into the batteries.
What is curious is that the alarm reports that the voltage is 52.27V, which is actually lower than the float voltage the DVCC sets (52.3V). I was unable to gain physical access the batteries before the alarm cleared and when I did gain access there were no abnormal status indicators on any of the US3000C units.
I will add that this has only occurred on four separate days during the past four months that the system has been commissioned, but three of them have been this month.
I do not have an interface cable which would allow me to interrogate the batteries. If anyone reading this has the details of how to make up the cable to check the batteries, and/or a link to the software download, I would appreciate it if they would make them available to me. I am and electronics tech. and won't be blundering about in there, making more trouble for myself. I'm not stressing about this but it would be nice to eliminate the problem.
Rusty
