Hi- I have a Mastervolt Lithium house battery
system, 200Ahr on our 38 ft sailboat. While on the marina, which is most of the time, shore power
keeps them at 100% via the Mastervolt charge controller.
I've read Lithium lasts longer if partially charged, reference friends with electric
I am hesitant to leave shore power
disconnected in case some drain drops the Lithium below salvageable level = $$. The only loads should be bilge pump
(zero draw), phantom loads, unless inverter
came on with shore power outage.
When away from the boat
I leave a dehumidifier running off AC, which is shore power fed. If advised to leave batteries
partially charged, I'd have to figure how to leave shore power on for the dehumidifer, but block the charge controller.