For the record, If I stop about 4 PM and get underway at 8 AM that is 16 hours parked. Running our 12V compressor refrigerator all the time is a variable because of ambient temperature but is rated about 5.2 amp draw but is own about an estimated 75% of the time so there is an average of about 4ah. I leave my inverter always on for convenience and that is about a 3ah draw leaving it on. The there are draws from the always on items like my Wifi Ranger, cell booster, Trik-L-Start, idiot lights, alarms, and the 5" Silverleaf screen. I estimate that at about 2-3ah. So that is about a 10ah average draw or in an overnight stay 160ah. I could reduce if I turned my inverter off but I have the articulating beds running a 120vac and I am alway manipulating them when parked. Also, we have a Keurig and microwave which really don't use much since they are on a very little time. But we do brew about 4 cups per stop. I leave the inverter on for the convenience of not setting the blinking microwave clock every time and of course my articulating beds and use of every 120vac outlet. Our other use is an induction cooktop, charging cell phones and iPads, Computer use, TV watching, and lights of course. With all LEDs the lighting is insignificant compared to our past RVs. Bottom line is a base of 160ah and up to 200ah intensive use. With an 800ah battery bank that shuts off at 20% I have a usable 640ah. So an all day stay could be up to 300ah but still get me two comfortable days. Maybe three.Davydd says his ARV uses 100ah per day with no camping use, and upwards of 300ah per day when camping with essentially no AC use. If idling with only 100ah per hour (davydd's new Delco alternator does better), you could need upwards of 3 hours a day. Run the AC, and you will be running the engine well over 50%, if it will even keep up idling.
Solar is insignificant on a 4 PM to 6 PM stay. Solar is insignificant unless staying multiple days because because our Delco Remy 320 second alternator charges at the rate of 220 amps at idle and 280 amps consistently and there is no heat drop off as with the Nations alternator. Even if I am staying put in a campground I still sight see, run to trail heads, run to the store or restaurant. Rarely do I sit. Running the engine for those tasks charges the batteries back up in well under an hour's driving time.
I know this because I can monitor my usage down to the percentage of charge and down to the amp hour with the Silverleaf monitor. There is no guessing. I treat my B electrically whether on shore power or not identically for convenience and have yet to run out of power, even conserve, and though I have Autogen (Voltstart with Roadtrek) but I never use it. I have no LPG on board and of course no Onan generator. Heating and hot water (instant) is via diesel-fired heat exchanger.
Hey, but if you want a Warp Core Roadtrek, Advanced RV has one for sale. They took it as a trade in for a customer.