I installed in a motor home in 2020 a 4S4P pack built from 16 ea Fortune 100AH LiFePO4 batteries I purchased from Electric Car Parts Co.. I also bought their BMS that is rated for max charge/discharge 200 amps. I was using it with a Xantrex inverter/charger rated at 2Kw/100amp charge. All was fine until I sold the motor home early this spring. I removed the battery pack and BMS but left the Xantrex and new FLA batteries for the new owner.
In May I installed a new Xantrex inverter/Charger-3Kw/150A charger along with my battery pack. While the pack was out of service and I was doing the Inverter install I strapped all 16 of the cells in parallel and let them sit for a week or so since the voltages were identical. Installation went well and I charged the pack and took the new RV out to dry camp. We have left it here at our lot for about month. We come every few days charge batteries (never below 50% SOC according to the Victron smart shunt) and stay for few days charging from genset through inverter charger at 150A verified with smart shunt. The charger parameters are set up as 14.5 V bulk/13.5V float. All started out well but I have noticed charger shutting down before it reached 14.5. The charge amps used to begin ramping down when voltage was at 14.2 and gradually going to zero when it hit 14.5V. I synced the SOC on smart shunt to 100% after the first charge cycle right after the installation and first charge. Now it is shutting down before pack reaches 14.0V and SOC on smart shunt is reading 94%. I suspect BMS is doing this because of cell inbalance. I checked the voltages shortly after last charge cycle and found them all running 3.35 +/- .01V. I realize that SOC may be very different even in cells that are reading same voltage. I thought about running RV on generator for a few hours while I take battery pack apart and move the cells into new positions as a way to equalize them but I wanted to check with the experts here to see if that is a good plan or not. Thank you for reading my lengthy post and welcome your input. In the meanwhile since I did not have any problems like this charging at 100A, I have adjusted my charger to charge at 90amps to see if that helps.
In May I installed a new Xantrex inverter/Charger-3Kw/150A charger along with my battery pack. While the pack was out of service and I was doing the Inverter install I strapped all 16 of the cells in parallel and let them sit for a week or so since the voltages were identical. Installation went well and I charged the pack and took the new RV out to dry camp. We have left it here at our lot for about month. We come every few days charge batteries (never below 50% SOC according to the Victron smart shunt) and stay for few days charging from genset through inverter charger at 150A verified with smart shunt. The charger parameters are set up as 14.5 V bulk/13.5V float. All started out well but I have noticed charger shutting down before it reached 14.5. The charge amps used to begin ramping down when voltage was at 14.2 and gradually going to zero when it hit 14.5V. I synced the SOC on smart shunt to 100% after the first charge cycle right after the installation and first charge. Now it is shutting down before pack reaches 14.0V and SOC on smart shunt is reading 94%. I suspect BMS is doing this because of cell inbalance. I checked the voltages shortly after last charge cycle and found them all running 3.35 +/- .01V. I realize that SOC may be very different even in cells that are reading same voltage. I thought about running RV on generator for a few hours while I take battery pack apart and move the cells into new positions as a way to equalize them but I wanted to check with the experts here to see if that is a good plan or not. Thank you for reading my lengthy post and welcome your input. In the meanwhile since I did not have any problems like this charging at 100A, I have adjusted my charger to charge at 90amps to see if that helps.