ImJustARegularJoe
New Member
- Joined
- Oct 27, 2019
- Messages
- 8
I posted a message last week about some issues that I was having in while on vacation in South America. I am back home and want to understand better what happened so that the next time I go there I can take the right equipment with me and hopefully have better luck.
In short, I was migrating from lead to LiFePO4 and the batteries (3x Huawei 48150b1) kept tripping because of overvoltage shortly after turning on the PV panels (~1200W). It appears that the BMS checks what the open circuit voltage is before getting into charging mode and trips if it's over 58V. I had the charge controller (Epever up5000-m8342) set to only charge up to 56.4V, but it appears that the open circuit voltage that it exposes is higher than that, which makes sense to me and in the world of acid was completely inconsequential.
I also have a wind generator, which doesn't even have a charge controller (I have a diversion load). I didn't try it, but I would totally expect to see the same issue there.
Since I have plenty of time before I go back, I am trying to figure out what my options are.
1.- Are there charge controllers that give more control over the open circuit voltage that gets exposed to the batteries? I understand that every charge controller worth its salt will enable me to stop charging at certain battery voltages, but it appears that that's not what's triggering my batteries.
2.- If not, I will attempt to replace the BMSs. There are a few videos (none in English) of people that ended up having to do that with these same batteries.
I could of course use different batteries, but they were a pretty large investment that I'd like to salvage, especially since getting stuff delivered so remotely is a pain.
In short, I was migrating from lead to LiFePO4 and the batteries (3x Huawei 48150b1) kept tripping because of overvoltage shortly after turning on the PV panels (~1200W). It appears that the BMS checks what the open circuit voltage is before getting into charging mode and trips if it's over 58V. I had the charge controller (Epever up5000-m8342) set to only charge up to 56.4V, but it appears that the open circuit voltage that it exposes is higher than that, which makes sense to me and in the world of acid was completely inconsequential.
I also have a wind generator, which doesn't even have a charge controller (I have a diversion load). I didn't try it, but I would totally expect to see the same issue there.
Since I have plenty of time before I go back, I am trying to figure out what my options are.
1.- Are there charge controllers that give more control over the open circuit voltage that gets exposed to the batteries? I understand that every charge controller worth its salt will enable me to stop charging at certain battery voltages, but it appears that that's not what's triggering my batteries.
2.- If not, I will attempt to replace the BMSs. There are a few videos (none in English) of people that ended up having to do that with these same batteries.
I could of course use different batteries, but they were a pretty large investment that I'd like to salvage, especially since getting stuff delivered so remotely is a pain.