While on shorepower, my motorhome’s 12V parallel AGM batteries (400A total) are being charged concurrently by a XANTREX Freedom SW 3012 inverter/charger and 990w parallel solar panels via BlueSolar MPPT 150/100. The SOC (for solar only) is managed through a Venus GX & BMV-712. The inverter/charger typically remains in a float condition throughout the day while plugged in to external power, maintaining the batteries at 100% SOC. There may be a few intermittent loads on the batteries throughout the day because the inverter/charger has a load mgmt system that supplements any insufficient power from shore (or generator) such as heavy start-up loads; however, the SOC typically remains at 100%. Upon daylight, the MPPT automatically enters absorption then float modes. I am not sure if both systems will recognize the other and adjust their float settings accordingly, possibly reducing battery life, and I am concerned that the batteries may be overcharged or damaged by keeping the inverter/charger and MPPT powered concurrently.
Question: To extend battery life, should I disable the MPPT while on shorepower; or should I disable the inverter/charger’s float function so that the batteries are not being charged concurrently from 2 separate sources? Or should I even be concerned about a system with 2 concurrent charging arrangements?
