Over the last 2 days the 100-50 solar controller has shifted from bulk charging my 400AHr lithium (BattleBorn) batteries before charging completes. Today the battery bank was at 92% SOC when it switched to float (at 13:11) and so it didn’t fully charge the batteries despite it still being a sunny day. Battery voltage reading from the solar controller shows 14.4v while the BMV-712 shows 13.44v at 13:11 when the switchover occurs. The solar controller is mounted 3 feet away from the battery bank so why would the solar be showing that much of a higher voltage (system installed for over 2 years with no issues, it was running at low loads (100% all day, 95% first thing in the morning) all winter, just started up higher amperage loads (used 76.6 amps last night) when this started to happen, no issues noted during the winter and low loads). Since the solar controller is sensing a much higher voltage it is shifting over to Float mode. The SOC has been very accurate all winter, once in Float the SOC continued to slowly rise up to 94.8 before the sun stopped providing power.
