Running an RV Air Conditioner While Driving: Factors and Considerations
The ability to run an RV air conditioner (AC) while driving primarily depends on several factors, such as how it is wired and the state of your leisure batteries. Understanding these aspects can help you make informed decisions about cooling your RV in hot climates during trips.
Factors Affecting Operation
Most RVs have a separate AC system that operates from a set of batteries that may not be directly charged by the RV's alternator. This distinction is crucial because it determines whether your leisure batteries are being replenished during use. In many cases, the engine itself provides an air conditioner for the cab area, and if this is insufficient, a built-in generator can supplement the roof air conditioning unit.
Alternating Between Cab and Roof Air Conditioning
On really hot days, many RV owners opt to use the roof air conditioning system, as it indirectly charges the coach battery. However, the battery is replenished while driving. For example, a class B RV equipped with a Dometic ceiling AC might be a good setup for this purpose. A different RV configuration could have other considerations, which might include the presence of an on-board generator that can run the rooftop AC unit even while driving.
Generators and Air Conditioning
There is no inherent limitation to running either the dash or the roof air conditioning with the generator operating. This was a common belief in the past, especially with the old adage that dash AC should not be used because it would significantly reduce fuel efficiency. However, advancements in technology, particularly the introduction of centrifugal compressors for dash AC, have made this outdated advice irrelevant. Modern diesel coaches often see no more than a negligible change in fuel economy, less than half a mile per gallon, which is statistically insignificant.
Dual AC Units in RVs
Many RVs, especially those from previous years, are equipped with two AC units: one standard automobile type that runs off the engine and is used for driving, and another that can be powered by 110V electricity from an on-board generator. This configuration allows for flexibility in cooling, depending on the current situation and the availability of power sources.
Conclusion
Whether you can run an RV air conditioner while driving depends on the specific setup of your RV and the state of your battery system. Modern technology has made it possible to use both dash and roof AC systems without significant impacts on fuel efficiency. Understanding these factors can help you make the most of your RV's amenities during hot weather and long drives. Always check your RV's manual or consult a professional to ensure that you are adhering to the proper procedures.