I have a MPPT 75/15 connected to 2 x 100W Flexable Solar panels, all powering my Renogy 12V 170AH Lithium-Iron Phosphate Battery. In the Victron app I'm using the battery preset for Lithium Iron Phosphate.
After a long trip away, my battery was very low (about 15% this morning) - I know this because I have a battery monitor.
At around 2pm today I when to check how charged the battery was, it was reading about 35%, but when I looked at the app to check solar charging, I noticed only 50W was being produced. My panels are in full sun. Then I noticed that the battery state on the Victron app was saying it was in Float mode, and was limiting the voltage to 13.5V.
I have a circuit breaker between my solar panels and charge controller, so I switched it off, and then turned it back on again, and now the battery is being charged in Bulk mode again at around 140W.
So my question is, why would the controller go into Float mode, when the battery is still low? How do I prevent this from happening again?