Boondocking power

The first night off the grid is when you learn what your coach really draws. The fridge clicks on, the furnace fan runs at two in the morning, and by breakfast the battery monitor is lower than you hoped. Most of that is fixable before you ever leave the campground.

Leave the hookup ready

Fleetwood’s 2019 Class A gas manual has a short dry-camping section, and it’s good advice. Arrive with charged batteries, a full fresh tank, a full water heater, and empty waste tanks. You can’t fix any of those once you’re parked in the desert.

Small habits that save amps

Run an absorption refrigerator on propane, and open the door less. Heat water about twenty minutes before you need it, then shut the heater off. Drop the thermostat a few degrees so the furnace cycles less. Open the windows before you reach for the roof air.

None of that is a watt-hour promise. It’s just how you stretch a bank.

Size the bank for a cloudy day

The Megawatt battery calculator adds a weather buffer of a day and a half of your load, even when the solar math looks fine on a sunny afternoon. It sizes the bank to whichever is bigger: your load minus solar, or that buffer. It never goes below one 12-volt 100Ah lithium pack.

For solar, that same tool assumes panel watts times 4 sun hours times 0.75. The separate solar calculator lets you pick 3, 4, or 5.5 sun hours instead. If you want the real sky, the solar forecast pulls a week of irradiance for your ZIP code from Open-Meteo.

Air conditioning is the deal breaker

The luxury preset with air conditioning checked lands around 11,000 Wh a day. That’s more than most roofs and most battery banks can carry overnight. If the trip needs A/C, plan on the generator or a hookup, and run the payback calculator with your own fuel price and campground fees.

Watch the wind

Wind still matters when you’re parked. The wind calculator gives a rough threshold (read its disclaimer), and the weather radio James links from that page is the one to keep in the coach.