Hi everyone,
I have the ‘build’ described in the below thread, in short 48v 280ah battery, Victron MPII 5000/48 and a JK BMS — in my Off grid cabin.
Shortly after I left the cabin in the summer, I could see through the remote monitoring that I started having issues with the charging from the MPPT. I have no idea why. Anyway, the battery fairly fast shut down itself, and I got to the cabin for the first time in 6 months yesterday.
Even despite heavy insulation, the batteries were really cold when I got there. Probably around minus 4-10. The voltage of the battery was first 11.6v, and they have not kept up to 11.86v after getting warmer (app 0.6-1v per cell). Not sure if they still are frozen in the core, should have started to get warmer at this point. But let’s see.
The JK BMS won’t start. When I connect a 9v battery to it, I can hear a buzzing sound from the Charger/Converter (MP2 5000/48 Victron), but I get no life from the BMS. The buzzing sounds a bit like conductors are charging up, or something like that.
I have a gas generator which I can charge the battery with, but to do that I must of course get the BMS to work.
Any tips on how to proceed? Should I try getting the BMS to start with a 12v battery? Let me know if I should post more info or any pictures.
I have the ‘build’ described in the below thread, in short 48v 280ah battery, Victron MPII 5000/48 and a JK BMS — in my Off grid cabin.
My 6k$ budget DIY Scaleable Off-Grid 15 kwh 48v LiFePo4 hybrid build with remote control and supervision function
v2. Introduction Hi everyone! I have always spent the summers and part of the winter out in the archipelago it the most northern part of the Bothnian Bay in Sweden (Finland is only a slap shot to the East). During summer time, we get sun 24 hours a day and, conversely, during parts of December...
diysolarforum.com
Shortly after I left the cabin in the summer, I could see through the remote monitoring that I started having issues with the charging from the MPPT. I have no idea why. Anyway, the battery fairly fast shut down itself, and I got to the cabin for the first time in 6 months yesterday.
Even despite heavy insulation, the batteries were really cold when I got there. Probably around minus 4-10. The voltage of the battery was first 11.6v, and they have not kept up to 11.86v after getting warmer (app 0.6-1v per cell). Not sure if they still are frozen in the core, should have started to get warmer at this point. But let’s see.
The JK BMS won’t start. When I connect a 9v battery to it, I can hear a buzzing sound from the Charger/Converter (MP2 5000/48 Victron), but I get no life from the BMS. The buzzing sounds a bit like conductors are charging up, or something like that.
I have a gas generator which I can charge the battery with, but to do that I must of course get the BMS to work.
Any tips on how to proceed? Should I try getting the BMS to start with a 12v battery? Let me know if I should post more info or any pictures.