Tell us more about your battery!
Regarding your RV's 12v domestic supply... keep these basic rules of thumb in mind...
- A 100Ah (Amp Hour) battery will provide power at 1 amp for 100 hours or 100 amps for one hour.
- Each 'standard' 21w light bulb uses 1.75 amps @ 12 volts. (A few of those old filament bulbs going at night will run down a battery pretty fast.)
Moving to LED bulbs is a good investment in terms of reducing power consumption...
Our LED bulbs are 3w each which draw 0.25amps per lamp.. In layman's terms, we can run 4 led lights for <400 continuous hours on our 100Ah leisure battery (in theory).
If we ran 4 standard 21w light bulbs, we'd only be able to run them for 14 hours continuous before the battery would be drained... (not a good idea BTW).
I learned all about being 12v power efficient when I had a sailboat with a crap engine alternator and a small wind generator. I became obsessive about how many amps everything used, because if I didn't, I'd be using candles to light the cabin by night...!
Have a look at all of the 12v appliances in your rig and look for the power consumption data. You'll be surprised at how hungry some of those suckers can be...
I'd put my money on your problem being one of the following...
- Something is running in the background that you haven't found yet.
- Bad electrical connections.
- Battery Ah rating is too small for the demand.
- Bad/old battery.