Or. A small, portable generator like this.
Honda1000Use it to run all your "stuff", coffee pot, fan on hot days, plus charge the car battery as needed. You can run a small inverter off the car battery then recharge the battery from the generator if you have to.
We have a small cargo carrier we use to carry the generator, gas can, lawn chairs, BBQ grill, etc.
Like your battery idea. It's nice and quiet but the generator gives a lot more flexibility.
Replacing your standard starting battery with a deep cycle marine battery might be worth some thought. They have a much higher amp hour capacity than your basic staring battery.
