I start with fully charged batteries and am frugal with my light use. I run one but no more than 2 lights at a time and don't run them for long. I have run 2 fans for 3 hours in one day and then one fan from 9 p.m. until 4:30 a.m. when I got up to go deer hunting. I then had a couple lights on for 45 minutes then turned everything off until I got back around 11:30 a.m. The fans went back on for a couple hours while I snoozed before going back into the woods. I am not using my water pump at all. I get back around 6:30-7 p.m. and a light will go on to fix an evening meal. If I leave the trailer to sit by the fire while I eat then I will turn the light out otherwize I will have the gang eat in the trailer with me (with front overhead light on of course). I may be saving power by the fact that the light over the sink is a single bulb and another a couple feet away has 2 bulbs. The light over the dresser has one bulb but I sometimes opt out for the multiple bulb reading light on the wall over my pillow. I've never experienced any power problem, dimming of lights or whatever.
'01 2500hd ext. cab, 8.1 litre gas, 5 sp. Allison auto
3.73 rear end
Mag-Hytec rear diff cover
Amsoil Dual by-pass oil filtration system
Amsoil synthetics all around
265 watt AM Solar, Inc. system