Just wire in a 600WATT PSW INVERTER and run a multi-head extension cord to the bedroom nite table and maybe to the home entertainment center area. This will be ON 24/7. Plug what you have to have on all the time low wattage items into this extension cord.
All you have to do is watch your battery voltage and when it drops to 12.0VDC either quit using the INVERTER or start charge it somehow.
This is what I do in my trailer setup, but I have 255AHs worth of batteries which usually last until 8Am the morning where I re-charge them back up during breakfast.
