i run all the electronics of 12 volts, including tvs, also have a digital volt and amp meter to show how much power i am usubg, so remembering i have 100 amp hours total. i do get a full night of power from the battery. equipment these days are pretty good on power. i have a 5 kva generator for charging during the day if required, or the solar panels on the roof as a little help for power charge. i have a small 500 watt inverter, used to be 5000 watt, but downgraded to 500 just to run the equipment. also many other power points around the van, just inverter power. but this inverter power is also mains of course when i have mains power. fully loaded with electronics and cardboard addons. ever the water dual tank system is very different. running dual tanks. but with electronic solinoids for switching to what ever tank i wish to use from the inside. one tank is always fresh drinking water, the other we use when near rivers, which i run a long hose with a pump at the end of it, this goes into the river, which is controlled by a float in the second tank to pump water into it, just for showers and non drinking water. my jayco is not the outback version, as i did not want extra height wind drag, so i run truck airbags on the 4 wheels to raise and lower the caravan if required, this inturn enables me to adjust the left or right side for self leveling when i pull up at a site. also with motorized feet that come down by remote control. still got more mods to do thou.