Keep in mind that those incandescent automotive bulbs will draw 1AMP EACH from your battery...
Those ceiling light fixtures have two of those bulbs in them... You can have as much 12AMPS or more being drawn rather quick with just the lights being on...
Thats like leaving your headlights on for several hours in your truck...
It takes some planning to run off your batteries and the first thing everyone does is get some LED lights running just for camping off the power grid... A LED light is a 80% current savings for each 12VDC Incandescent automotive bulb.
Our battery bank is 255AHs capacity and we can run just about everything we want to run except the air conditioner and the microwave unit. We run a bunch of 120VAC low wattage items from a 600WATT PSW Inverter and the other items are direct connected to the 12VDC batteries.
Then our game plan is only run the battery down to its 50% charge state then charge it back up the next morning when allowed to run our portable generator to the 90% charge state so we can do this all over again the next day night run off the batteries. We have the 2KW Honda generator and connect the trailer shore power cable directly to the generator which will run the on-board converter/charger using smart mode charging to recharge our battery bank back up to their 90% charge state in as little as three hours of generator run time.
We never had much luck just showing up at the camp site and making it through the night without planning...
We also never had good luck unless our battery bank was charged up to their 90% charge state before running them all night. Usually got dark around 10PM each night.
Two of those 6VDC golf cart batteries will give you between 200 and 225AHs capacity depending on which ones you purchase.
The SAMs CLUB batteries will cost around $90 each plus a couple of dead batteries... Ask them first if they will take two 12VDC dead batteries - bet they will...
We tried all of these games in our back yard until we got what we wanted to before going camping off the power grid...
Roy ken
