I have set up my 2009 Coachmen Mirada in our backyard due to needing break from home repairs. I have a 30 amp plug from house that the rv is using. I noticed my batteries are not charging as needed per monitor panel and lights going dim. I turned off the electric water heater but still using both air conditioners as well as tv units. However, I can start the rv and the monitor indicates charging as I would expect from house plug-in. After running the engine for app. 20 minutes the monitor indicates battery level is good but will fall to fair in about 15 minutes and low in about an hour. Why charging ok with engine running but not from house plug in? I checked the cabin batteries (3) and the terminals on two need cleaning but if that was the problem wouldn't it have same charging problem with both home plug and engine running??? This is 50 amp unit but I don't think I had this problem before I had the 220 circuit put in and ran it off 120. Stumped..
P.S. Right now it doesn't have enough power to close the two slide-outs. Hope I can close slides by using generator when closing down rv....