This site is now in read-only archive mode. Please move all discussion, and create a new account at the new Victron Community site.
Brand new install. 4x12v lifepo4 each bank of 2 wired in series and paralleled through bus bars. First bank operates and balances flawlessly. 2nd bank, when connected in series, one battery shows continuity between pos and negative posts. When disconnected from series, no continuity. When in charge mode from mp2 24/3000, battery in question does not receive charge voltage, other in series jumps to 15v and warms up.
I currently have the BMS on standby and this series disconnected. I'm stumped.
This is after being disconnected for several hours. Upper bank 2 is the one that sees the voltage and temp rise, upper 1 is the one that sees no change when charger is on.
@Chuck Stollery This is after being disconnected for several hours. Upper bank 2 is the one that sees the voltage and temp rise, upper 1 is the one that sees no change when charger is on.
First thing, you dont charge a SLB without a BMS unless you have a very specific reason.
Looking at the manual it gives Initial charging before use procedure. It also points out that batteries may arrive with large Soc differences, and large state of charge differences between them that won't be corrected if installed that way.
If a battery bank will consist of batteries connected in series to make a higher voltage bank, then each battery must be charged individually first. Use a dedicated charger or an inverter/charger with a BMS to perform the initial charge.
Batteries that are overcharged will heat up, such as your UB 2. The BMS if it had been operational would have prevented that.
Your UB 1 battery is not fully charged as yet. Follow the procedure ^ and charge it until VC reports it as "balanced".
@Chuck Stollery It has not had any power applied at all without the Smart BMS from Victron.
Something is wrong there. Given your OP said other in series jumps to 15v and warms up. The BMS should have cut charge once any cell in UB 2 went over 3.75v. Check that your BMS is operational.
