Matty-Lee
New Member
- Joined
- Jan 21, 2021
- Messages
- 49
I think my BMS may be cutting out too early.
My 12v system consists of:
BMS (actual product link no longer available, I have a 80A non-smart version)
4 LifePo4 Cells (200 Ah)
EPever Charge controller
I disconnected the solar to see how long it would last and found out that the BMS disconnected the battery with it measuring 12.2v.
I checked the cells individually and they were all nicely balanced.
When I reconnected the solar the charger reported that there was at about 50% charge.
This is disappointing because one of the reasons I went for LifePo4 was that the usable capacity is supposed to be better than lead acid or AGM.
When I look at the spec sheet for the BMS it says the over discharge detect voltage is 2.2, presumably per cell, so the BMS should disconnect at 8.8 volts...is that right?
My charge controller is set up as the chart below except I have changed Boost & Float charging voltages to be 13.6 (to prolong the life of the battery):
When fully charged the battery is reading 13.3v
Can anyone spot if I have made an obvious mistake or what is not looking right?
Thanks,
Matt
My 12v system consists of:
BMS (actual product link no longer available, I have a 80A non-smart version)
4 LifePo4 Cells (200 Ah)
EPever Charge controller
I disconnected the solar to see how long it would last and found out that the BMS disconnected the battery with it measuring 12.2v.
I checked the cells individually and they were all nicely balanced.
When I reconnected the solar the charger reported that there was at about 50% charge.
This is disappointing because one of the reasons I went for LifePo4 was that the usable capacity is supposed to be better than lead acid or AGM.
When I look at the spec sheet for the BMS it says the over discharge detect voltage is 2.2, presumably per cell, so the BMS should disconnect at 8.8 volts...is that right?
My charge controller is set up as the chart below except I have changed Boost & Float charging voltages to be 13.6 (to prolong the life of the battery):
When fully charged the battery is reading 13.3v
Can anyone spot if I have made an obvious mistake or what is not looking right?
Thanks,
Matt