I installed 2 12 volt group 27 batteries
If I unplugged the electric, those batteries wouldn't run my furnace for 1/2 hour. The converter won't kick in until batteries drag down to 12.3 then charge up to 14.6 volts so I have pulsating up and down lights and furnace.
The converter is quite warm to touch most of the time. I think its 55 amp converter. I've owned many campers and never had this behavior.
If I add batteries should I enlarge my converter?
I took batteries to Auto Parts store, they both tested 100%...