I leave my trailer with its Intellipower plus Charge Wizard plugged into the mains for 8 months each year, with the batteries connected, in the heat of a Florida summer. The battery separators are still covered with electrolyte when I return, and the Group 27 Wal-Mart batteries are at 13.6 volts. I'm impressed.
Nick Crowhurst, Excella 25 1988, Dodge Ram 2500 Cummins Diesel. England in summer, USA in winter.
"The price of freedom is eternal maintenance."