corn18
Village Idiot
- Joined
- Sep 9, 2021
- Messages
- 715
I installed a SOK 206 Ah LiFePO4 (LFP) a while back and it worked great. I had used cheapo cutoff switches and circuit breakers, so I swapped those out for the good stuff. Specifically, I replaced the generic battery cutoff switch and 100A circuit breaker coming from the battery with a Blue Sea 3 pole 250A circuit breaker that I also use as a switch.
The issue since the upgrade is that my LFP goes into protect mode when I flip on the breaker (nothing is on but the propane detector). The power comes on for a moment, and then cuts off and the battery is in protect mode. The only way to get it out of protect mode is to unhook the negative terminal from the battery and hook it back up. That's a pain. Interestingly, once I do that, everything works fine. I can flip the master breaker as many times as I want and the power cycles fine without the BMS going into protect mode.
If I leave the system off for a while and turn it back on with the breaker, the same thing happens again.
If I leave the system off for a while but disconnect the converter before I turn the system on (via its circuit breaker), the BMS does not go into protect mode. All works fine. I can turn it off and on without issue. The converter is a Progressive Dynamics 9160ALV made specifically for LFP duty. If I turn the converter on after I turn the main 250A breaker on, all works fine. Hmmmmm....
I cannot figure out what is causing the BMS to go into protect mode if the converter is connected.
Any ideas?
Here's my wiring diagram:
The issue since the upgrade is that my LFP goes into protect mode when I flip on the breaker (nothing is on but the propane detector). The power comes on for a moment, and then cuts off and the battery is in protect mode. The only way to get it out of protect mode is to unhook the negative terminal from the battery and hook it back up. That's a pain. Interestingly, once I do that, everything works fine. I can flip the master breaker as many times as I want and the power cycles fine without the BMS going into protect mode.
If I leave the system off for a while and turn it back on with the breaker, the same thing happens again.
If I leave the system off for a while but disconnect the converter before I turn the system on (via its circuit breaker), the BMS does not go into protect mode. All works fine. I can turn it off and on without issue. The converter is a Progressive Dynamics 9160ALV made specifically for LFP duty. If I turn the converter on after I turn the main 250A breaker on, all works fine. Hmmmmm....
I cannot figure out what is causing the BMS to go into protect mode if the converter is connected.
Any ideas?
Here's my wiring diagram: