Any options to refill within BRC or do you need to bring all gas with you?
Would some sort of solar panel recharging setup be of any use?
Sorry if my questions are obvious once you've been. It's pretty clear that I'm a BM virgin.
The RV fridge will run on propane, as will the stove/oven, hot water heater, and furnace. If the tank is full, you'll have way more than enough propane for a week.
The furnace needs a little battery power for it's fan, the fridge a tiny bit for it's light and control board. The lights and water pump are battery.
The A/C is the big power draw, next is the microwave although of course that's only for short periods. You'll need the generator to be running for those, and you'll also want to run it a little every day because the RV will recharge it's batteries when the generator is running.
You can figure on about 1 gallon of fuel per hour to run most RV generators. It will draw fuel from the RV's gas tank, but the generator's fuel line is set up so it won't suck fuel after the gas tank gets below about 1/4 full, so you can't accidentally run the RV completely out of gas and strand yourself.
So: let's say you have a 50-gallon gas tank in the RV. If you arrive in BRC with it topped off, say in Gerlach just off the playa, you have about 3/4 of that available for the generator, roughly 36 gallons. Theoretically you've got about 36 hours of generator running time. If you want to leave the A/C on all day every day, (I do!) you'll need to bring more gas. Yep, you gotta bring your own.
A solar panel will help a little, maybe enough to keep the batteries topped off enough so you can operate most of the other RV systems, but unless it's an extremely large setup (that a rental RV isn't likely to have) it's not gonna make enough electricity for the A/C.
Last I checked, most RV rental agencies charged an additional $3/hour for generator running time, so remember to figure that into your budget too. Isn't that nice!