Mine stays plugged in all the time with the battery isolation switches left on. The converter(if a smart charger) will keep the batteries maintained. Your "tinkering, repairing, adding stuff and general visiting will keep your whole unit better maintained than those that are ignored. It will cause you to "exercise" the stuff in yours more than you may think. Mine is about five feet from the back door in a carport and I'm constantly giving the old girl a lot of TLC. This causes me to really feel for the folks that have to store theirs.