An RV uses electricity from a battery by using 12 volt appliances and electronics. Not every appliance in an RV is 12 volt, so not everything will work when you're not plugged into shore power. For instance, the air conditioner, wall outlets, microwave, and TV won't work. Unless it's a 12 volt TV. If your RV has one of those. When heading out to go dry camping or boondocking expect your RV batteries to only run the appliances listed above. You won't be able to use the AC, microwave, electric water heater, electric fridge option, wall outlets, or TV in most. You can use generators or portable power stations (solar generators) to plug in your RV to 120 volt power. This will charge the batteries and let you use the wall outlets. Most campers go with the generator option which works well but.
Where it becomes important is when you are dry camping (no shore power) and the reserve power (amp-hours) in your RV batteries is all you have to supply your electrical needs. A typical deep-cycle RV battery will be rated around 80 amp-hours, which in theory would supply one amp for 80 hours.
An RV can run off a single RV battery, but not forever. You need first to know how long you want to run your RV off batteries and how much power you'll need between charges. Once you know how much power you'll need, you can select your batteries. Depending on the size and type of your batteries, you may get by with one or two batteries.
What is an RV battery?
An RV battery is what powers an RV's 12-volt electrical system. While the battery may look similar to a typical car battery, its function is very different. These batteries provide a small amount of power over a long period. This is typically sufficient for using lights, a water pump, or running the fan on an RV's furnace.
Most RVs rolling out of the factory typically rely on the battery to power fans, lights, and the RV's water pump. They also use the battery to power slides and leveling jacks. If you completely drain your RV while doing some off-grid camping, you'll need to charge it up so you can bring in your slides and raise your landing gear.
One of the most common batteries used in RVs is a lead-acid battery. These batteries are typically one of the cheapest options available and the lowest-performing. They can suffer permanent damage if discharged below 50% or if they're not properly maintained. These batteries need to be topped off with water to keep them working efficiently.
An RV uses electricity from a battery by using 12 volt appliances and electronics. Not every appliance in an RV is 12 volt, so not everything will work when you're not plugged into shore power. For instance, the air conditioner, wall outlets, microwave, and TV won't work. Unless it's a 12 volt TV.