Hi,
If you are looking at a battery with CCA rating, and not a high "Reserve Capacity at 25 amps" then your battery might have been switched with a car battery sometime after leaving the factory and before you bought the trailer.
Sometimes a experienced RV owner will demand two batteries from the dealership in order to make the sale, and the salesman might say "I will take one from trailer over there, nobody will know the difference" and you ended up buying that trailer.
Here is what I would recommend, based on my battery life of 13 years when I checked the water regularly, and I was able to give those batteries to a friend, who kept using them. Golf Cart Batteries. My second set only lasted about 7 years, mainly because I was not keeping them full of water. But still that is much longer than the average 12 volt battery will last.
I was using Trojan T-105 that came with my Fleetwood Bounder RV. I installed a second pair of batteries. THis gave me 440 amp hours at 12 volts, or about 5,000 watts total. Now I am using Costco deep cycle golf cart batteries, as Trojan does not have a large distributor near here.
I also have a pair of solar panels on the roof. The CO and propane detectors use about 0.8 amps per hour, and along with the refrigerator will use about 35 AH daily, or about what one 120 watt solar panel will put out.
Furnace can use another 35 AH daily too, if you are camping in cooler weather. Lights are about 1 AH per hour, per light. LED lights are much more efficient, about 0.2 amps per hour per light. Water pump is about 7 or 8 amps per hour. Don't worry much about the water pump, it can pump 2 GPM while drawing 8 amp hours and empty a 120 gallon water tank in that time.
So my suggestion? IF you like to dry camp, get a pair of golf cart batteries. If you like to dry camp a week or more at a time, then 4 golf cart batteries.
A pair of 120 watt solar panels can help you recharge daily, and you can get away with only 1 pair of batteries.
SunElec.comFred.
