There are a variety of companies that make RV generators. I will refer to Onan in this article. Other makes use similar designs.

There are 3 fuels used for generators: gasoline, diesel, or propane. Gasoline and propane use a very similar and sometimes identical engine. Diesel generators are typically larger, use a larger engine and have a higher electrical output. Gasoline and diesel generators are matched to the RV’s engine fuel. Propane generators are typically used in diesel coaches to keep costs down. (Propane generators are much less expensive than diesel generators)

Generators in motor homes typically use the coach batteries for power. They have an electric starter and usually a remote start panel inside the RV. Once started, they have a DC charging system to charge the coach batteries. The DC charging system has a low amperage output in comparison to the coach engine’s alternator.

The controls used in generators are very complicated. There are a variety of safety issues associated with generators, and the controls are one of the methods used to provide safety. When experiencing a generator starting, output, or running problem take the unit to a professional for service.
Most generator repairs are not DIY friendly.  At Wilson RV, we offer professional generator service and repair.
We are  authorized Onan and Generac Service Center.

Generator output is measured in watts. Type C motor homes typically have a 4000 watt generator. 4000 watts is enough to power 1 roof top air conditioner along with a microwave and most portable electrical items that use a common household 15 amp outlet. RV’s with 2 air conditioners need a minimum of 5500 watts to run both air conditioners at the same time. Some RV’s with 2 air conditioners use a 4000 watt generator to power 1 air conditioner, but require a 50 amp shore power connection to power both air conditioners.

Generators can be run while driving your RV. Some basic safety rules should be followed. The generator should always be turned off prior to refueling. Be certain the exhaust system is intact before running the generator. Be a good neighbor: Don’t run your generator if the exhaust or noise will bother someone close by.