RV Glossary
Browse RV and towing terms
Browse RV and towing terms with practical definitions and related concepts used throughout our towing-capacity pages.
1
12-Volt System
The 12-volt system powers many essential RV components including lights, fans, slide motors, and water pumps. It operates from the RV battery system.
120-Volt System
The 120-volt system powers household-style appliances in an RV when connected to shore power or a generator. It works much like the electrical system in a standard home.
3
30 Amp Service
30 amp service is a common RV electrical hookup that provides 120-volt power through a single connection. It supports basic RV systems and many smaller motorhomes or trailers.
5
50 Amp Service
50 amp service provides more electrical capacity for larger RVs and allows multiple high-demand appliances to run at the same time. It is common on larger fifth wheels and motorhomes.
A
Amp Hour (Ah)
Amp hour, or Ah, is a measurement of battery capacity that indicates how much electrical energy a battery can store and deliver over time. It is a key specification when sizing RV battery systems.
B
Battery Bank
A battery bank is a group of batteries connected together to store electrical power for RV use. It provides power for lights, fans, pumps, and other systems when shore power is unavailable.
Battery Disconnect Switch
A battery disconnect switch allows RV owners to shut off battery power when the RV is stored or not in use. It helps reduce battery drain and preserve battery life.
C
Converter
A converter changes incoming AC power from shore power into DC power to run 12-volt RV systems and charge the batteries. It is a core part of most RV electrical systems.
G
Generator
A generator produces electricity for an RV when shore power is not available. It can power appliances, air conditioners, and battery charging systems while camping off-grid.
I
Inverter
An inverter converts 12-volt DC battery power into 120-volt AC household electricity inside an RV. It is especially useful for off-grid camping and running standard appliances without shore power.
L
Lithium Battery
A lithium battery is a lightweight, long-lasting RV battery that charges quickly and can be discharged more deeply than traditional lead-acid batteries. It is a popular upgrade for modern RV electrical systems.
M
MPPT Controller
An MPPT controller is a solar charge controller that maximizes the efficiency of solar charging by optimizing voltage and current. It is generally more efficient than a PWM controller.
P
PWM Controller
A PWM controller is a basic solar charge controller that regulates power from solar panels to the battery. It is typically less efficient than MPPT but more affordable.
S
Shore Power
Shore power is an external electrical connection that supplies electricity to an RV at a campsite or storage location. It allows the RV to run appliances and charge batteries without using a generator.
Shore Power Cord
A shore power cord connects an RV to an external power pedestal or outlet at a campground. It supplies electricity for RV systems, appliances, and battery charging.
Solar Panel
A solar panel captures sunlight and converts it into electrical energy to help charge RV batteries. Solar power is popular for boondocking and off-grid RV travel.
Surge Protector
A surge protector helps protect an RV electrical system from voltage spikes, low voltage, and campground power issues. It is one of the most recommended RV electrical accessories.
T
Transfer Switch
A transfer switch automatically changes the RV power source between shore power and generator power. It helps ensure smooth, safe transitions without manual rewiring.