It depends on how long between trips the TC is in limbo. If it's more than a couple weeks, I drain the water, blackwater, greywater, right away: purge and blow out the water system leaving the knife valves and big black cap open. Especially in warmer weather I have an issue with leaving any fresh water in the tank in storage. Once a year we purge and use bleach in the lines to clarify things. The TC has some detectors that use power whether you are there or not. I have flattened a couple camper batteries in the last 12 years and now disconnect the camper battery cables completely and use a float charger on it. One time i thought I would use the camper and did not over a four month period with everything power connected. My truck starting batts are all connected to the TC batt. with a #6 cable. They are all the same A.H. battery. All three batteries went down for the count and could not be resuscitated.
I don't think they make batteries like they used to, for whatever reason. I have a lot of trouble with batteries on all my machines: cars, trucks, jeeps, tractors. The man behind the counter at our local auto parts place said most are now outsourced to Mexico and don't do well in long term storage. Of course, he was trying to sell me float chargers and i went for it.
I've never left the TC connected to shore power except during the two days cool down of the fridge before liftoff and on the road in a full-hookups campground.
jefe
