I have a 2022 320S BD with the WFCO 8735LiS power center. I recently purchased a 100Ah Powerurus LiFePo4 battery. The charging voltage from the WFCO (switch set to Lithium) should be about 14.8V when in bulk mode, but it is only about 13.7V - 13.8V. I also tried charging with the Victron solar controller only and its output was 13.7V - 13.8V at the battery as well. I disconnected the battery and measured the voltage from the WFCO as 14.8V with the solar charger turned off. I then pulled the fuse on the solar wire connected to the battery (and turned the Victron charger on) and it measured 14.8V. It appears the battery is clamping the voltage. Has anyone observed this?
I tried calling WFCO tech support today, but they never returned my call.
The battery is failing as it can only deliver about 4 amps for a few hours before the battery voltage goes to zero.
I have contacted the manufacturer and they have asked me to fully charge (but I need to do this at 14.8V) and then let them know the battery voltage after an hour of rest. I have ordered an external Lithium charger that should be here tomorrow and will try to charge with that and see if it can be charged at 14.8 volts.
I'm leaving for the Terlinga Rally Monday so I'll have to go to plan B and put my old LA battery back in for the trip and deal with this when I return.