I have 2 new SOK 100ah batteries with Bluetooth, wired in parallel. I'm using a Victron Multiplus 12/3000 set to 50a for charging, 14.4 absorption, 13.6 float.
Both batteries have one cell that hits 3.7v and the BMS will disconnect.
When charging, one cell of a battery is hitting 3.7v while the other cells will hover around 3.45v. Once the BMS disconnects the Victron voltage will jump past 15v and the other battery's BMS will disconnect. Rinse and repeat.
I tried setting the Multiplus to 14.0v for absorption and reduced the current to 5a which gave me about 1a input to each battery (RV DC system is using the rest). I still hit the 3.7v ceiling on one of the cells.
Should I be having cells this far out of balance on new batteries? From what I understand I can use a bench supply and charge each low cell to 3.65v to get things balanced out. Or, put a load on the higher voltage cell while charging to bring it down?
Both batteries have one cell that hits 3.7v and the BMS will disconnect.
When charging, one cell of a battery is hitting 3.7v while the other cells will hover around 3.45v. Once the BMS disconnects the Victron voltage will jump past 15v and the other battery's BMS will disconnect. Rinse and repeat.
I tried setting the Multiplus to 14.0v for absorption and reduced the current to 5a which gave me about 1a input to each battery (RV DC system is using the rest). I still hit the 3.7v ceiling on one of the cells.
Should I be having cells this far out of balance on new batteries? From what I understand I can use a bench supply and charge each low cell to 3.65v to get things balanced out. Or, put a load on the higher voltage cell while charging to bring it down?