limbery wrote:
OP here....You make good points...I was asking because we plan on attending a large festival this summer and we'd be stuck in a crowded field with the TV removed for about 4 nights min.... and it's all unserviced...
In that case, you might not want to pee on the neighbour's tires!
What you could do is just charge and bring extra batteries of mixed capacities. Say you have a boat with a deepcycle in it, charge and bring it along. Even if it gives you 2 days with just that battery alone, its a plus.
Take out some items from your TT to shed some weight, like extra tools, fishing rods, stuff you won't need at the festival and replace it with a jugs of water.
You can also dry flush your toilet, pee and flush without turning your water pump on. Less clean water going into your black tank.