I have built a 4 cell 280ah lifepo4 battery, with an overkill solar BMS. Before installing it in my RV I charged and discharged it many times on my workbench, with a progressive dynamics charger and it works great. The problem arises when I charge with the inverter/charger in my RV ( Xantrex freedom xc 2000 ). The charger has a glitch which Xantrex says they would replace if it was under warranty. When the charger is set to charge at 14.4 volts it charges in bulk at full amps (80) until it hits about 14.4 volts then switches to absorb and continues at about 14.4 with the amps slowly dropping until the amps drop off rapidly. All is good until at this point the voltage spikes up to about 14.9 but only for a few seconds then drops back to 14.4 this trips my BMS over-voltage circuit. It does the same thing if set to charge at 14.0 volts. At 13.8 volt it does not trip the BMS but does not charge at full amps just due to the lower voltage.
The charger does the same thing with my old lead acid batteries so it is not the lifpo4. Xantrex thinks it has always done this I just never noticed it with lead-acid batteries. I only discharge and charge the batteries when dry camping about 25 days per year. The rest of the time the charger will be on shore power set to float at about 13.2 volts. Can I raise my BMS cell max limit to 3.8 volts and my battery max to 15.2 volts to accommodate the few-second voltage spike?
Thanks for your help.
The charger does the same thing with my old lead acid batteries so it is not the lifpo4. Xantrex thinks it has always done this I just never noticed it with lead-acid batteries. I only discharge and charge the batteries when dry camping about 25 days per year. The rest of the time the charger will be on shore power set to float at about 13.2 volts. Can I raise my BMS cell max limit to 3.8 volts and my battery max to 15.2 volts to accommodate the few-second voltage spike?
Thanks for your help.