RV owners often ask: How many watts does an RV air conditioner need? Knowing your RV AC unit wattage is crucial for trip planning, choosing generators, and managing energy costs. This guide explains RV AC wattage, what influences electrical needs, and tips to keep your cooling efficient.
| AC Size (BTU) | Starting Watts | Running Watts | Typical Application |
|---|---|---|---|
| 9,000 – 10,000 | 1,800 – 2,200 | 1,200 – 1,400 | Small campers, pop-up trailers |
| 13,500 | 2,500 – 2,800 | 1,500 – 1,700 | Average travel trailers |
| 15,000 | 3,000 – 3,500 | 1,800 – 2,000 | Larger RVs, fifth wheels |
Factors Affecting RV AC Unit Wattage
Several key factors impact the wattage required by an RV air conditioner. Understanding these will help you accurately estimate your power needs.
AC Unit Size (BTU Rating)
The BTU (British Thermal Unit) output mainly determines how many watts your AC uses. A 13,500 BTU model is standard, while larger RVs may use 15,000 BTU units. Higher BTU equals higher wattage requirements.
Starting Watts vs. Running Watts
All RV AC units require a higher surge of power upon startup, called starting watts. This momentary spike can be almost twice the running wattage. RV owners should consider both figures when selecting a power source or generator.
Voltage and Amperage
Most RVs operate AC units on 120V power. To estimate wattage, multiply amperage by voltage (Watts = Amps x Volts). For instance, a 13,500 BTU model draws about 12-14 amps at 120V, totaling around 1,600 watts while running.
Temperature, Humidity, And Insulation
Hotter and more humid climates make the AC compressor run harder, increasing energy consumption. Poor insulation or large windows in the RV also raise the effective wattage needed to maintain comfort.
Wattage Requirements Of Common RV AC Models
To answer how many watts does an RV AC unit use, here’s a breakdown by unit size and brand. Actual numbers may vary according to efficiency and RV models.
| AC Brand/Model | BTU | Starting Watts | Running Watts |
|---|---|---|---|
| Dometic Brisk II | 13,500 | 2,750 | 1,650 |
| Advent ACM135 | 13,500 | 2,700 | 1,600 |
| Furrion Chill | 15,000 | 3,200 | 1,900 |
| Atwood AirCommand | 15,000 | 3,300 | 2,000 |
Generator And Shore Power Sizing For RV AC Use
To power an RV AC, you need a generator or shore power source that can handle both the starting and running wattage of your unit, plus power for other appliances.
Generator Sizing For Air Conditioning
A single 2,000-watt generator can run a 9,000 or 10,000 BTU AC, but most 13,500 BTU models require at least a 3,000-watt generator to enable reliable starting and operation. For dual AC units (common in larger rigs), a 4,000- to 5,500-watt generator is recommended.
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Shore Power Considerations
Typical RV hookups provide 30-amp or 50-amp service. A 30-amp hookup (at 120V) supplies up to 3,600 watts—enough for one 13,500 or 15,000 BTU AC with some capacity for other devices. For multiple ACs, a 50-amp service (providing up to 12,000 watts across two legs) is preferable.
Managing RV AC Power Consumption
Reducing air conditioner-related energy usage is possible with practical strategies that enhance comfort, cut costs, and improve off-grid capability.
- Upgrade insulation in your RV to keep the cool air in and hot air out.
- Use reflective shades or insulated curtains on windows and skylights to block direct sunlight.
- Install vent fans or open windows during cooler mornings and evenings to reduce the cooling load.
- Maintain your AC by cleaning or replacing filters and ensuring all ducts are clear.
- Set your thermostat a few degrees higher and use fans for air circulation to reduce run time.
- If possible, park in the shade or use awnings to prevent your RV from heating up.
Running Multiple Appliances Alongside The AC
Running other electrical appliances (like microwave, coffee maker, or fridge) while using the air conditioner can quickly overload your power source. It’s vital to add up all running wattages.
| Appliance | Average Running Watts |
|---|---|
| 13,500 BTU AC | 1,600 |
| Microwave | 1,000 |
| Coffee Maker | 800 |
| Hair Dryer | 1,200 |
| Refrigerator | 180 |
Be aware: Simultaneous use of the air conditioner with high-wattage appliances could cause circuit breakers to trip, especially on 30-amp hookups or small generators.
Soft Start Kits And Inverter Technology
Many RVers install soft start kits to their air conditioners. These devices reduce the initial spike of current on startup, allowing smaller generators or batteries to power AC units more effectively.
Benefits Of Soft Start Kits
- Lower starting wattage demand enables use of smaller generators or inverters.
- Prevents electrical system overloads or nuisance breaker trips.
- Extends lifespan of AC compressor and electrical components.
Inverter Air Conditioners
Modern RV air conditioners equipped with inverter compressors deliver variable-speed performance, further reducing overall power consumption and starting wattage. These units maintain comfort more efficiently and are ideal for solar-plus-battery setups.
Wattage And RV Solar Systems
If you want to run your AC off-grid with solar panels and batteries, you must calculate your watt-hour demand carefully. Most conventional RV solar setups can only run an air conditioner for short periods unless you have a very large array and battery bank.
- A single 13,500 BTU AC running for 4 hours could consume 6.5 kWh (6,500 watt-hours).
- Solar arrays on the roof are typically limited to 600-1,200 watts of peak output under ideal conditions.
- Using lithium batteries (like 400+ Ah at 12V) and efficient inverter models can help maximize runtime, but will require significant investment.
- Consider hybrid solutions: running AC on shore power/generator during peak heat, and using fans and ventilation when off-grid.
Calculating RV AC Power Needs (Formula & Examples)
To determine the exact wattage your RV AC draws, use the following steps:
- Check your AC’s data plate for rated voltage (V) and current (A).
- Multiply voltage (V) × amperage (A) for wattage (W). Example: 13.0 A × 120 V = 1,560 W.
- Remember to account for higher starting watts, which might be twice your running wattage.
Use a clamp meter or energy monitor for real-time measurement for even more accuracy.
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Frequently Asked Questions About RV AC Unit Wattage
Can My RV Air Conditioner Run On A 2,000 Watt Generator?
Most 13,500 BTU or larger ACs cannot reliably run on a 2,000 watt generator due to high starting wattage—unless a soft start kit or inverter AC is installed. A 2,000 watt unit may be enough for a 9,000–10,000 BTU AC with soft start assistance.
How Much Power Does An RV AC Use In A Typical Day?
Assuming 8 hours of use, a 13,500 BTU RV AC consumes roughly 12–14 kilowatt-hours (kWh) per day. Usage will vary depending on cycling frequency, thermostat setting, and weather conditions.
Can I Run My RV AC On Solar Power Alone?
In most situations, a standard RV solar system is not sufficient for continuous AC use. Running an RV air conditioner on solar power requires a large battery bank, a high-capacity inverter, and a significant solar array. Most solar setups are intended for lights, fans, refrigerators, and electronics—not air conditioners.
Key Takeaways For RV AC Unit Wattage
- RV AC units typically use 1,500–2,000 running watts and 2,500–3,500 starting watts.
- Choose generators and shore power hookups sized for your AC’s peak demand plus other appliances.
- Soft start kits, inverter ACs, and energy-saving strategies can reduce power requirements and operating costs.
- Solar-powered AC is possible, but only practical in large, advanced systems.
With careful planning and up-to-date knowledge of your RV’s energy needs, you can enjoy cool comfort while minimizing power costs and travel limitations.