I have Victron 100/50 solar with 550w connected to my marine system with 450ah of victron LiPo4 batteries. I have the Cyrix Li Ct installed as well as the BMS 712 and the Victron battery protect. Recently when running the engine I received high voltage alarm from my AGM starter battery ( at 15.6v). House bank was still around 14.2 ( lithium).
Happened twice when motoring for longer time periods. Then the other day at the dock plugged into shore power with solar on and with the Victron Multi Invertor/Charger on charging mode got another high voltage alarm of 15.6 on the agm starter battery, but house bank at 14.2. I voltage tested the battery at the terminals both times and it was high voltage.
My alternator is a 120 amp on a Beta marine 50. Engine and alternator as well as all victron systems are only 2 years old.
Any advice on how to trouble shoot this would be appreciated. Currently in Mexico in an area with no Victron support available.
