Shawn, how come you have such a system?
You seem to be very different to everyone else, do you take a tank of unpurified water with you and process it as you use it?
Most of us will have pure water in out tank, then up to two poles can be powered off a single battery.
I'd be interested to know why you have such a different system to everyone else!
And yes! Leisure batteries all the way, car batteries are not designed for constant draw...
Ian