RV generators come in a wide range of sizes - from 2,500 w - 12,500 w. Choosing the right size depends on how many appliances you plan to run at the same time in your RV.
An RV generator powers your rig when the generator's internal combustion engine converts the chemical energy stored in the fuel to mechanical energy or rotation. The alternator, coupled to the engine, converts this mechanical energy to electrical energy. This electrical energy then flows to your RV’s circuit breaker panel to feed the loads, equipment and appliances within your RV while you're enjoying your campsite.
Considerations when choosing the right size generator for an RV
We are here to help you find the right size RV generator.
Appliance power
First, check the wattage of all the appliances in your RV. Most modern RVs feature wiring for 30 or 50 amp shorepower, and AC units typically require the most power out of all the appliances.
Appliance usage
It’s not likely you will need to run all appliances at the same time. If you choose 2-3 appliances that may run at once, you will have an idea of how many watts you require. Keep in mind that the watts required to start up an appliance jump and then level off as the appliance is running.
Watts needed
If you multiply your RV’s amperage (30 amp or 50 amp) by the voltage of your appliance, you will know how many watts you have available.
RVs have either 30 amp or 50 amp electrical service that determines how much power the RV can pull at a time. A 50 amp service can handle more electric power than a 30 amp service; this is because a 50 amp service can handle a higher volume of electrons. When you multiply amperage with voltage, you find the electrical power. Most electrical equipment in RVs operate at 120 volts, independent of 30 amp or 50 amp service.
To find how many watts of power you have available, you can multiply volts times amps. For example, a 30 amp RV with a 120 V electrical source would be capable of handling about 120 x 30 or 3,600 watts of electric power.
Along with providing exceptional generators for you to choose from, you also have access to Cummins Coach Care for RV owners and operators across America.
Find the right RV Generator Solution
Cummins provides a variety of generator types based on needs, budget, fuel type, and your preferences.
Portable RV generators
Portable generators provide flexibility, and are at a lower price level than an onboard generator.
Installed RV generators
Onboard generators are a great investment that will last you many years. No need to pack a separate generator or fuel for it – it's always ready go when needed
RV inverter generators
These generators are the latest technology in RV power generation. They are quieter, cleaner and require less maintenance than their predecessors.
Find Cummins RV generator dealers in your area
Still not feeling totally confident in choosing the right size generator? You can have total peace of mind when you work with a certified, local Cummins dealer.
RV generator sizing FAQs
An RV with a 30 amp shorepower connection and with 120 volt appliances would be capable of handling a maximum of 3,600 watts of electric power. This means a 3,600 watt generator would give you the same amount of power as shorepower. You can also get a 4,000 watt generator for a 30 amp coach to give additional electrical motor-starting power. A 2,500-2,800 watt generator is often a good minimum threshold for 30 amp RVs that have AC units.
A 30 amp circuit uses 120 volts; this means there is about 3,600 watts (30 x 120) available for use.
A 50 amp RV with a 120 volt electrical feed is capable of handling 12,000 watts of electric power.
This depends on the size of the AC and how many BTUs it has. An RV AC unit with 7000 BTUs requires 1700 watts for start up but levels off to 600 watts while running. An RV AC unit with 15,000 BTUs requires 3500 watts for start up and levels off to 1500 watts while running.
A 30 amp circuit in an RV can run 3600 watts, or 3 smaller appliances such as a toaster, microwave and coffee maker.
