Boondocking power
The 2019 Fleetwood Class A gas manual’s dry-camping note is practical. Arrive with charged batteries, a full fresh tank, a full water heater, and empty waste tanks. Run an absorption refrigerator on propane. Open the box less. Heat water about twenty minutes before you need it, then shut the heater off. Drop the thermostat a little so the furnace cycles less. Use windows before you reach for the roof air.
Those are coach habits, not a watt-hour promise. The Megawatt battery calculator is where the watt-hours come from, and only for the boxes you leave checked. Its weather buffer is 1.5 days of your daily load, even if solar covers the math on a sunny afternoon. Net storage is the larger of “load minus solar” and that buffer, and it never drops below 1,280 Wh.
Solar production in that same widget is panel watts times 4 hours times 0.75, times the number of days. The 4 hours are fixed inside the battery tool. The separate solar calculator lets you pick 3, 4, or 5.5 peak sun hours. The forecast page replaces both guesses with Open-Meteo irradiance for a ZIP code.
Air conditioning is the load that ends a quiet camp. The luxury preset is about 11,000 Wh per day if you leave it checked. Most roofs and most battery banks are not there to run three air conditioners overnight. If that is the trip, plan on a generator or a hookup, and use the payback calculator with your own fuel price and hookup fee.
Wind still matters when you are parked. The wind calculator is an estimate with a wide disclaimer. The weather-radio link on that page is the one to keep in the rig.