We left our trailer for 3 months and found their 3 27 series Interstate deep cycle/starting batteries dead. They had tendency to self-discharging and with the trailer store under the roof the
solar system did not work. Charging recovered them to at best to 50% of their capacities. One of the batteries leaked a little of acid so tongue tray corroded in few places. I combined repainting, installation of new batteries with installation of recently purchased 25lb.
fiberglass LPG tanks into one project. Lifting 30lb LPG steel tank was a dreadful event, a key reason for getting new
fiberglass tanks. It was tight squeeze but I managed. New batteries are 27 series Exide NG27, real deep cycle batteries and they are about 1” taller and 15lb/ea. heavier (65lb/ea.) than old dual purpose Interstates. The mount of steel LPG tanks had to be removed and replaced with my own design simple
fiberglass tanks mount. I painted the
battery tongue tray with polyurethane
paint (truck bed liner). See the pictures. The end result is 315AH of deep cycle batteries with 50lb of LPG visible through the fiberglass tanks; and dreadfulness of refueling the heavy tanks is gone.
George.