RV AC Unit Wattage: Comprehensive Guide To Power Consumption, Efficiency, And Selection

Understanding RV AC unit wattage is crucial for comfortable travel, efficient energy use, and safe electrical setup. Whether you’re boondocking or staying at a powered campground, knowing how many watts your RV air conditioner uses helps you plan for generator sizing, solar systems, or shore power needs. This article explores wattage demands, energy-saving tips, and selection criteria to ensure optimal cooling without overloading your rig’s electrical system.

Aspect	Details
Common RV AC Sizes	13,500 BTU, 15,000 BTU, smaller portable units
Average Running Wattage	1,000–1,700 watts (varies by size and model)
Starting Wattage	2,000–3,500 watts (brief surge)
Generator Recommendations	2,500–4,000 watts for single unit
Energy Efficiency Tips	Maintenance, insulation, using soft starts, LED lighting

What Is RV AC Unit Wattage?

RV AC unit wattage refers to the amount of electrical power that your motorhome’s air conditioner consumes during operation. This is measured in watts and includes both the running wattage for continuous use and the higher starting wattage required to power the compressor at startup.

Understanding wattage is fundamental for sizing your generator, knowing your campsite power requirements, and planning battery or solar solutions.

Standard RV Air Conditioner Sizes And Their Wattage Demands

Most RV air conditioning units fall within standard sizes, typically measured in British Thermal Units (BTUs). The two most popular are 13,500 BTU and 15,000 BTU. Higher BTUs provide greater cooling power but require more wattage to operate.

13,500 BTU RV AC Units

• Starting Wattage: 2,700–3,000 watts
• Running Wattage: 1,300–1,600 watts

A 13,500 BTU unit offers a balance between cooling capacity and energy efficiency, making it a top choice for most mid-sized travel trailers and fifth wheels.

15,000 BTU RV AC Units

• Starting Wattage: 3,200–3,500 watts
• Running Wattage: 1,500–1,800 watts

These larger units are well-suited for bigger RVs or hotter climates but demand more from your electrical system. Proper generator sizing is critical for safe and efficient operation.

Smaller & Portable RV AC Units

• Starting Wattage: 1,500–2,000 watts
• Running Wattage: 700–1,000 watts

Compact units can be a good choice for camper vans and teardrop trailers. They provide essential cooling at the cost of reduced total BTU output.

Factors Influencing RV AC Wattage Usage

Several variables dictate how many watts your RV air conditioner will use in real-world conditions. These factors can help you estimate average and peak power demands.

Factor	Impact
Ambient Temperature	Hotter days require more frequent compressor cycling
Humidity	Higher humidity increases cooling workload
RV Size & Insulation	Poor insulation results in higher wattage use
AC Maintenance	Clogged filters and dirty coils reduce efficiency
Other Electric Appliances	Concurrent use strains overall wattage availability

Regular maintenance and good insulation play a major role in reducing your AC’s energy consumption.

Running Versus Starting Watts: Why The Distinction Matters

RVs air conditioners have two wattage ratings: starting (surge) and running (continuous). The starting watts are a brief spike as the compressor starts, often double the running watts. For example, if your 13,500 BTU AC requires 1,500 running watts, the starting wattage could reach 3,000 watts for a few seconds.

This distinction is critical when choosing a generator, since it must handle the initial surge without tripping.

How To Determine Your Actual RV AC Unit Wattage

Each model is different, so check your owner’s manual or the manufacturer’s data plate. Wattage can also be calculated with this formula:

• Watts = Amps x Volts

Most RVs in the US use 120V power, so a unit drawing 13 amps would use 1,560 watts (13 amps x 120 volts).

Generator Sizing For RV AC Units

Generator sizing is one of the most frequently asked questions for RV owners. The generator must supply enough wattage for AC startup and continuous operation, plus any other appliances used at the same time.

Sizing Chart

AC BTU Size	Recommended Minimum Generator Size (Watts)
13,500 BTU	2,800–3,500
15,000 BTU	3,500–4,000
Two Units (Combined)	5,000–7,000

If running other high-wattage appliances (like microwaves), increase your generator size by at least 1,000–2,000 watts.

Soft Start Devices: Reducing Starting Wattage

Installing a soft start device can significantly reduce the amount of watts needed at startup by controlling how quickly the compressor engages. This is particularly helpful if you want to use a smaller generator, or when running your AC on solar and inverter power.

• Soft start kits can cut starting wattage by 30-50%
• Popular brands: Micro-Air EasyStart, Dometic SoftStart

This upgrade is a game-changer for RVers using portable generators or battery/inverter setups.

Energy Efficiency Tips To Lower RV AC Power Consumption

Reducing how hard your AC has to work means less electricity use and lower generator demand. Here are actionable strategies:

• Keep windows and doors closed tightly during AC operation
• Use Reflectix window covers or blackout shades to minimize heat gain
• Add extra insulation to your roof and RV walls
• Maintain your AC with clean filters and coils
• Switch to LED lighting, which produces less heat
• Use fans to circulate cool air and balance temperature

Integrating these steps can save hundreds of watts and extend off-grid cooling time.

RV AC Unit Wattage And Shore Power Connections

Most RV campgrounds offer either 30-amp or 50-amp shore power hookups. A single AC unit is easily handled by a 30-amp service, as this circuit provides 3,600 watts (30 amps x 120 volts). If running two ACs or multiple high-powered appliances, a 50-amp service (up to 12,000 watts total) is recommended.

Always check the total load before turning on multiple appliances at once to avoid tripping breakers.

Can You Run An RV AC On Batteries Or Solar Power?

Running an RV AC on batteries or solar alone is technically possible but challenging. Air conditioners are among the most power-hungry appliances—drawing 1,500+ watts continuously. This would drain an average RV battery bank in less than an hour.

Requirements For Off-Grid AC Operation:

• Large lithium battery bank (400+ Ah recommended)
• High-output inverter (2,000+ watts, preferably pure sine wave)
• Soft start device
• Extensive solar array (1,000+ watts panel capacity recommended)

Even with this setup, expect only a few hours of runtime unless you supplement with a generator.

Dual Air Conditioner RVs: Wattage Considerations

Many larger fifth wheels and Class A motorhomes come equipped with two air conditioners.

• Combined running wattage: 3,000–3,400 watts
• Combined starting wattage: up to 5,000–7,000 watts if both kick on simultaneously

Staggered start controls or soft starts are often installed to prevent simultaneous high surges that could overwhelm your generator or campground electrical circuit.

How To Read Your RV AC Unit Label For Wattage Data

Every air conditioner comes with a manufacturer’s label, usually located under the shroud or near the electrical connection. Look for:

• Model and serial number
• Voltage (should be 115V–120V)
• Current draw (in amps) for cooling and fan modes
• Maximum wattage or “locked rotor amps” (start up)

For the most accurate info, use these label values to calculate your required power supply—especially if considering upgrades.

Comparing RV AC Wattage With Home AC And Other Appliances

Appliance	Typical Running Watts
RV AC (13,500 BTU)	1,500
RV Refrigerator	180–300
Microwave	900–1,200
TV	100–300
Coffee Maker	600–900

RV AC units are clearly at the top of the chart, underlining the importance of accurate wattage planning.

Popular RV AC Unit Brands And Their Wattage Ratings

The following brands are highly regarded in the RV industry for both efficiency and performance. Below are common models and typical wattage requirements:

• Dometic Brisk II 13,500 BTU: 1,500 running watts, 3,000 starting watts
• Coleman Mach 15 15,000 BTU: 1,800 running watts, 3,500 starting watts
• Furrion Chill 14,500 BTU: 1,700 running watts, 3,200 starting watts
• RecPro 9,500 BTU: 950 running watts, 1,600 starting watts

Always consult specific manufacturer data for your exact unit, as even similar models can vary in draw.

Wattage Impact Of AC Age, Maintenance, And Upgrades

Older RV air conditioners tend to consume more power. Worn components or clogged condenser coils cause the compressor and fan to work harder, raising amperage and watt use.

Routine maintenance not only extends AC life but maximizes energy efficiency, saving fuel or electricity on every trip. Upgrading to a high-efficiency model can also lower running watts by up to 20% compared to legacy units.

Seasonal And Regional Wattage Considerations

Climate and location affect energy demands significantly. In Arizona or Florida summers, ACs may run nearly around the clock. In northern states, much less power is needed.

• Backup generators are more essential when boondocking in hot climates
• Energy-saving upgrades pay off quickly for frequent travelers in the South

Plan your electrical setup with your travel patterns in mind for maximum comfort and safety.

Frequently Asked Questions About RV AC Wattage

• Q: Can I run my RV AC on a 2,000-watt generator?
  A: Possibly, if you have a small AC and a soft start device. For 13,500 or 15,000 BTU units, a larger generator is recommended.
• Q: How long will my batteries run my RV AC?
  A: With a typical 200-amp-hour bank, you may only get 30–40 minutes of runtime. Substantial upgrades are needed for extended operation.
• Q: What other appliances can I run with my AC?
  A: You can safely run low-wattage items (lights, TV), but avoid starting a microwave, hair dryer, or coffeemaker at the same time.

Key Takeaways For RV AC Unit Wattage Management

• Identify your AC’s BTU and wattage requirements
• Choose a generator that exceeds starting wattage
• Consider soft starts and high-efficiency upgrades
• Optimize insulation and shade for maximum cooling performance
• Monitor total amperage draw when connecting at campgrounds

By proactively managing your RV AC unit wattage, you’ll enjoy reliable cooling, safe electrical operation, and freedom to explore the open road regardless of where your adventures take you.