Sanwizard
Solar Wizard
- Joined
- Feb 2, 2021
- Messages
- 2,664
Andy at the Off Grid Garage has recently done testing on different SOC cells placed in parallel. No sparks, but he saw up to 200 amps moving between the cells once connected.Hi, does anyone know if it's OK to parallel the Heltec/JK BMS? I want to build 2 16S packs, each w/ a BMS, and then parallel the packs. I read JBD's spec sheet, and it seems to specifically parallel BMS w/ this statement:
"Direct parallel connection of batteries is not supported (there is the problem of high current discharge from high voltage batteries to low voltage batteries due to direct parallel connection of batteries)"
I can't think of a case where hooking up battery banks in parallel would cause a high current discharge between them, unless 1) one of them shorts out or 2) you connect a batteries together that are in different states of charge. If the 2 packs are at the same SOC when you hook them up, this shouldn't be an issue, right?
That was with a direct parallel, and not what you are suggesting, which I believe is to connect two seperate batteries via a busbar. That is exactly what I am doing with Lishen 280ah 16s batteries using two Heltec/JK BMS's. No issues. I made sure both batteries were very close in SOC before connecting them up.