The RV needs to be plugged in to a power source in order for any 110v lights or power outlets to work. So if you are dry camping you won't be able to charge your phone unless you are using the generator, which I'll talk more about that later:) Also, the moment you plug your RV to a power source the refrigerator automatically switches from using the propane to using the power. The a.c does not work unless you are plugged into a power source of 30amps or more. Being plugged in to a power source makes life in the RV very easy and extremely comfortable.
Don't get me wrong here, the RV is great whether you are dry camping or being hooked up, but it takes a lot more effort to make things work while not being hooked up to a power source. When dry camping the batteries make the lights work( the non 110v lights), and the furnace could run off of the batteries too, but we haven't tried that yet. The batteries would drain after a couple days of use without recharging it, and it would take about 72hrs for the batteries to be full again when plugged into a power source. That is why the generator comes in handy. The generator not only gives 30amp plus power to the RV, it also charges the batteries, so it is suggested that when dry camping use the generator a couple times a day for a few hours to keep the battery from draining completely and to enjoy any 110v, air conditioner, or the microwave. We have a 5 gallon generator that when full it can power the RV for 12 hrs, so we always keep a gas container full for backup if we need it.
The propane tanks run the oven, water heater, and the refrigerator(only when you are dry camping). With both propane tanks full you would have enough propane to last you a little less than two months. That's if you don't leave the oven on all night because you forget to shut it off...oooppps!!:) Each propane costs a little less than $30 to fill depending on where you buy it from.
All of this may sound extremely boring, but it was one of the things that you need to learn the fastest because when it storms it creates a whole new challenge. We've had a few times where the storms have been so bad we've lost power which involves a little process to get things running again. First off if the power gets shut off on the sites main breaker you have to go outside and turn the breaker back on, but before you do just make sure to turn the a.c. switch off, so you don't mess anything up with the air conditioner. After you turn the breaker on outside(if it was needed) double check that the breaker panel inside the RV didn't shut anything off automatically to protect the RV (our RV has this feature, but some don't). If everything is set you have to wait 5 mins before turning the air conditioner back on or it won't work. One of the storms we had was so severe the air conditioner didn't go back on after we did all these steps, and a lot more work was needed but that was because the ac switch was left on and it was running without enough power, so it is important to really know what to do in these situations so that a small problem doesn't turn into a big problem.
Another interesting fact about the air conditioner that no one told us before is that you can not refill the freeon, so when it's done, it's done. Also, when the temperature is extremely hot outside the ac it is not capable of keeping things cool like you would want it to, it will be able to stay about 20 degrees less than the outside temperature unless you have a second air conditioner, which some RVs aren't set up for a second unit. You also have to be plugged into a 50 amp power source if you have two air conditioners. So far we only have had a problem with extreme heat once, and when that happens just be ready to take a million cool showers:)
When dry camping you may have enough propane to last you a couple of months, and with the generator you can keep things running smoothly in terms of power, but the fresh water tank lasts about two days, and the grey, black, and galley tanks need to be emptied about 1/week depending on how much water you are using to do dishes and take showers. So be prepared to have to move the RV all the time to fill water and empty the holding tanks. It is an extreme pain to set up the RV and break it down, so I suggest that when you can, find a place with full hookup because it is worth not having to deal with the hassle of moving the RV every other day. When you travel between destinations then dry camping is fine because you can fill up the fresh water stay a couple days, and then empty your tanks before traveling to a new destination. You never want to travel with the RV holding tanks full.
With a full hook up site not only do you get power, you get water, and your own emptying station, so once you are set, you don't have to worry about anything else unless you lose power, but that's usually a quick fix, and then you are back to enjoying the RV life:)