Portable RV Generators

Another way to feed 120-volt power into the RV is from an onboard generator. A generator is standard equipment in most motorized RVs, but is less common in trailers. When camped away from hookups, the generator is the only way to power-up the larger equipment onboard. Most generators run on gas, although some run on diesel or propane. For the most part, generators in motorized RVs run off the same fuel source as the main motor. However, if they share the fuel with the motorized engine, the generator will automatically shut itself off when fuel levels drop to one-quarter of a tank, so it won't cause the vehicle to run out of gas or diesel fuel. It is always a good idea to plan ahead and have a full tank when you are planning to use the generator.

 A gallon of gasoline or diesel fuel will usually keep a generator running for about two hours. A generator should be started and run for a minute or two before turning on 120-volt appliances. A generator can even be used while a motor home is en route. Cooling down a larger motor home on the go by using the dashboard air conditioner is practically impossible in very hot weather. So the generator can be employed to run the main air conditioner inside the coach.

What About Watts? 

The power output of a generator is measured in watts. Know the output of your generator and guard against exceeding it. If you use too many 120-volt appliances and exceed the generator's capacity, you'll trip a circuit breaker (just like at home in the stick-built house.) Most large onboard generators put out between 4,000 and 7,500 watts.. .some higher on big rigs. Small motor homes can have generators with a power output of 2,000 to 3,000 watts. When in doubt, check the owner's manual of your generator and of any major appliances to be able to monitor usage. Amp or watt draw is usually listed.