What Size Generator To Run An RV Air Conditioner?
To reliably run your RV air conditioner, you’ll generally need a generator that can deliver between 3,000 and 4,000 watts. However, the exact wattage required depends on your specific AC unit’s starting and running wattage, so understanding your RV’s power needs is crucial.
Understanding RV Air Conditioner Power Requirements
Choosing what size generator to run an RV air conditioner can be daunting. You can’t just plug in any generator and expect it to work flawlessly. Air conditioners, especially RV units, have unique power demands, particularly during startup. This section will break down those requirements, equipping you with the knowledge to make an informed decision.
The Importance of Starting vs. Running Watts
Air conditioners don’t draw the same amount of power constantly. They require a surge of power, known as starting watts, when the compressor initially kicks on. This surge is significantly higher than the running watts, which is the power needed to keep the AC unit operating once it’s up and running. Ignoring the starting watts is a common mistake that can lead to generator overload and damage to both the generator and your RV’s appliances.
Calculating Your RV Air Conditioner’s Wattage Needs
To determine what size generator to run an RV air conditioner, start by finding the specifications plate on your AC unit. This plate will list the starting and running wattage. If the starting wattage isn’t listed, a general rule of thumb is to multiply the running wattage by 2.5 or 3. Let’s look at an example:
- Running Watts: 1,500
- Estimated Starting Watts: 1,500 x 2.5 = 3,750
In this case, you’d need a generator that can handle at least 3,750 watts to start the AC unit.
Considering Other RV Appliances
Don’t forget that you’ll likely want to power other appliances besides your air conditioner. Add up the running wattage of all the other devices you anticipate using simultaneously (refrigerator, lights, microwave, etc.). Add that total to the starting wattage of your air conditioner. This will give you a more realistic estimate of the total wattage you’ll need from your generator.
Choosing the Right Size Generator
Once you know your total wattage requirement, select a generator that exceeds that number. It’s always better to have some headroom. A generator running at or near its maximum capacity constantly will wear out faster and may not be able to handle sudden power spikes. Aim for a generator that can handle your peak wattage needs comfortably.
Types of Generators Suitable for RV Air Conditioners
There are various types of generators, each with its pros and cons. The most common choices for RVs include:
- Inverter Generators: These are generally quieter, more fuel-efficient, and produce cleaner power, making them ideal for sensitive electronics. They’re often more expensive, but worth the investment for many RVers.
- Conventional Generators: These are typically more affordable and can provide higher wattage output for the price. However, they are usually louder and less fuel-efficient than inverter generators.
- Dual Fuel Generators: These generators can run on either gasoline or propane, providing flexibility in fuel options.
Common Mistakes to Avoid
- Underestimating Starting Wattage: This is the most common mistake. Always factor in the surge needed to start your AC unit.
- Ignoring Other Appliance Loads: Failing to account for the power needs of other appliances can overload your generator.
- Buying Too Small a Generator: It’s better to err on the side of having too much power than not enough.
- Neglecting Maintenance: Regular maintenance is crucial to keep your generator running reliably.
- Using the Wrong Type of Extension Cord: Use a heavy-duty extension cord designed for outdoor use to avoid voltage drop and potential hazards.
Fuel Considerations and Runtime
Consider the fuel capacity and efficiency of the generator. How long do you want it to run on a single tank of fuel? Factor in the fuel consumption rate at different load levels. Some generators offer extended runtime modes for fuel efficiency. Also consider fuel availability; gasoline may be more readily available, but propane can be more convenient for RVers already using it for other appliances.
Noise Levels and Regulations
Noise is a significant consideration, especially in campgrounds. Check the generator’s decibel rating (dB). Lower dB ratings indicate quieter operation. Also, be aware of campground noise regulations and choose a generator that complies with those rules. Many campgrounds have quiet hours where generator use is restricted.
Table of Recommended Generator Sizes for Common RV Air Conditioners
| AC Unit Size (BTU) | Estimated Starting Watts | Recommended Generator Size (Watts) |
|---|---|---|
| 13,500 BTU | 3,500 – 4,000 | 4,000 – 4,500 |
| 15,000 BTU | 4,000 – 4,500 | 4,500 – 5,000 |
Note: These are estimates. Always check your AC unit’s specifications plate for accurate wattage information.
Frequently Asked Questions (FAQs)
What happens if my generator is too small to run my RV air conditioner?
If your generator is too small, it will likely overload and shut down. This can potentially damage both the generator and your RV’s electrical system. The air conditioner may also fail to start, or may start and then quickly shut off. Consistently overloading a generator can significantly shorten its lifespan.
Can I use a soft start capacitor to reduce the starting wattage of my RV air conditioner?
Yes, installing a soft start capacitor can significantly reduce the starting wattage of your RV air conditioner, potentially by as much as 50-70%. This allows you to run your AC unit on a smaller generator. They are a popular and cost-effective upgrade for RVers looking to reduce their power needs.
Are inverter generators worth the extra cost for running an RV air conditioner?
In many cases, yes. Inverter generators provide cleaner power, which is important for sensitive electronics. They are also generally quieter and more fuel-efficient than traditional generators. The higher price is often offset by the benefits, especially for frequent RVers.
How do I properly maintain my RV generator to ensure it runs reliably?
Regular maintenance is essential. This includes changing the oil, cleaning or replacing the air filter, replacing the spark plug, and checking the fuel lines. Consult your generator’s owner’s manual for specific maintenance schedules and procedures. Improper maintenance can lead to performance issues and reduced lifespan.
What is the difference between surge watts and continuous watts?
Surge watts refer to the maximum power a generator can provide for a short period, typically during startup. Continuous watts (also known as running watts) refer to the power the generator can sustain continuously. When determining what size generator to run an RV air conditioner, always consider both, giving priority to the surge (starting) watts requirement.
Can I run two smaller generators in parallel to power my RV air conditioner?
Yes, if you have two compatible generators that can be connected in parallel, you can combine their power output. This is a good option if you already own a smaller generator and want to avoid buying a larger, more expensive unit. Ensure compatibility before attempting to connect them.
How does altitude affect generator performance?
At higher altitudes, the air is thinner, and generators produce less power. You may need to derate your generator’s output by approximately 3-3.5% for every 1,000 feet above sea level. This means you might need a slightly larger generator than you initially thought to compensate for altitude-related power loss.
What type of fuel is best for my RV generator?
This depends on the generator. Some run solely on gasoline, while others can run on propane or even both. Gasoline is generally more readily available, but propane can be more convenient for RVers who already use it for other appliances. Dual-fuel generators offer the most flexibility.
Are there any safety precautions I should take when using an RV generator?
Yes. Always operate the generator in a well-ventilated area to prevent carbon monoxide poisoning. Never run the generator inside your RV. Use a carbon monoxide detector inside your RV. Store fuel safely and away from the generator. Use a heavy-duty extension cord rated for outdoor use. Regular safety checks are crucial.
How long can I expect my RV generator to last?
The lifespan of an RV generator depends on several factors, including the quality of the generator, how often it’s used, and how well it’s maintained. With proper care, a good quality generator can last for several years or even longer.
How can I reduce the noise produced by my RV generator?
You can reduce noise by using a generator with a low decibel rating, placing the generator away from your campsite, using a sound-dampening enclosure (but ensure proper ventilation!), and parking your RV to help block the sound. Strategic placement can make a big difference.
Where can I find the starting and running wattage of my RV air conditioner?
The starting and running wattage of your RV air conditioner can typically be found on the specifications plate located on the unit itself. This plate contains important information about the air conditioner’s power requirements. If you can’t find the plate, consult the owner’s manual or the manufacturer’s website.