Replace your light bulbs with low power consumption LED's. Most of the draw on your batteries is from the lights! Also, if you want to leave a light on for the kids you can do so without drawing your battery down. Some rv bulbs draw as much as 28watts each. Led replacements are int he range of 1.5 - 3W each. That's right basically two 1156 bulbs incandescent bulbs use similar power to 20 led replacements.