Coach battery overcharging
I have a Rockwood Mini Lite 2109s . I have been using this trailer to live in at a work site away from home . The trailer is plugged in most of the time except for week ends when I go home . The original coach battery lasted almost 2 years and then started losing a charge over the weekend . Put in an interstate deep cycle battery and it lasted 15 months. I was going to sleep 1 night and the cooling fan for the coach 12v power supply came on . Checked the coach battery and it was warm and the plates had sulfated . My question - I thought the coach 12v power supply is supposed to keep the coach battery in the correct state of charge? Seems like it’s not a very sophisticated battery charger . I just got a new battery but it looks like I will have to not connect it while the trailer is plugged in .