Understanding the power requirements of your recreational vehicle air conditioning is essential for any owner who values comfort and electrical safety. An average RV air conditioner typically demands between 1,300 and 1,500 watts during the startup phase, known as the surge or inrush current, and settles into a running load of approximately 600 to 800 watts. This distinction is critical because the startup surge is significantly higher than the steady-state consumption, dictating the capacity of your generator or shore power supply needed to operate the unit without tripping breakers.
Breaking Down the Power Draw: Running vs. Surge
The primary reason wattage discussions surrounding RV AC units can be confusing is the difference between running watts and starting watts. The running watts are the continuous power required to keep the compressor and fan motor operating once the unit is cool. The starting watts, or surge watts, are the immense power spike needed to overcome inertia and get the compressor pistons moving from a stationary state. This initial surge can be three to four times the running load, making it the true test for your vehicle's electrical system.
The Technical Specifications You Should Know
Most standard roof-mounted RV air conditioners are designed to function within a specific electrical framework. To determine the exact needs of your specific model, you should consult the data plate located on the unit, but industry standards provide a reliable benchmark. A typical 13,500 BTU unit—the most common size—will specify a running wattage of roughly 600 to 700 watts and a starting wattage of approximately 1,600 to 1,800 watts. This means your power source must reliably supply at least 1,800 watts to handle the initial load safely.
Calculating Your Generator Capacity
If you rely on a portable generator for power, you must ensure its rated output exceeds the demands of your air conditioner. It is a common mistake to look only at the running watts and select a generator that meets that number. Because the startup surge is so substantial, you should aim for a generator with a surge capacity that is at least 2,000 to 2,500 watts for a standard 13,500 BTU unit. A 3,000-watt generator provides a comfortable buffer, ensuring the unit starts reliably and other onboard appliances, like refrigerators or lights, can run simultaneously without overloading the system.
