I purchased a Victron Blue Smart IP22 Charger 12V/30A 3 Outlet in December 2022. I use it to charge the 3 batteries on my cruiser boat. When I went to the boat last week I discovered the shore power to my boat was disconnected (i had been there 2 weeks before and all was OK). I discovered that the marina fuse was tripping because of my boat. I disconnected the battery charger and the fuse did not trip. I also tried to start engine but batteries appeared dead. I tried another battery charger on each of the 3 batteries and to my horror discovered it registered 6 and 7 volts for each battery. I also checked the Victron polarity on each of the batteries and this was correct. My question is how could this happen? Also are these batteries rechargeable again and how can I do this or are batteries dead., which means big expense! Finally if I have to get new batteries y is there a risk there is an issue with the Victron and the same thing happens again. I did try the Victron on a single battery and all looked OK.
Hopefully somebody can help!!
