13,500 to 16,500 watts, or 30-45 amps.
RV air conditioners typically draw between 13,500 to 16,500 watts, translating to 30 to 45 amps at 120 volts. The exact amperage depends on the unit's BTU rating and efficiency. Starting amperage (surge) is significantly higher, often 2-3 times the running amps, requiring a robust power supply.
Understanding RV Air Conditioner Power Draw
- BTU Rating: Higher BTU means more cooling, but also higher power consumption.
- Voltage: Most RV AC units operate on 120V AC power.
- Efficiency (EER): A higher Energy Efficiency Ratio (EER) means more cooling per watt.
Calculating Amperage
To calculate amperage, use the formula: Amps = Watts / Volts. For example, a 15,000-watt AC unit on a 120V system draws 125 amps. Remember to account for the surge amperage when sizing your generator or shore power connection.
Surge Amperage Considerations
RV air conditioners have a high surge amperage when the compressor starts. This can trip breakers or overload generators. A soft starter can reduce surge amperage. Ensure your power source can handle both running and starting watts.
Power Supply Options Comparison
| Option | Cost (Approximate) | Pros | Cons |
|---|---|---|---|
| Shore Power (30 Amp) | $50 - $150 (Adapter/Cord) | Convenient, reliable. | Limited power, may not run AC and other appliances. |
| Shore Power (50 Amp) | $100 - $200 (Adapter/Cord) | More power, can run multiple appliances. | Requires compatible RV and campsite connection. |
| Generator (Gas/Propane) | $800 - $3000+ | Portable, independent power. | Noisy, requires fuel, maintenance. |
Reducing Power Consumption
- Use a reflective roof coating to reduce heat gain.
- Park in the shade whenever possible.
- Insulate your RV well.
- Consider a smaller, more efficient AC unit.