What Size Generator to Run AC in RV for Comfortable Camping

Choosing the right generator size for your RV can be a bit overwhelming, but don't worry, I've got you covered. A 3,000 to 4,000 watt generator is often sufficient for small to medium-sized RVs with one or two AC units.

For larger RVs or those with multiple AC units, a 5,000 to 7,000 watt generator is usually the way to go. This will ensure you have enough power to keep your air conditioning running smoothly and comfortably during hot summer days.

The size of your RV and the number of AC units it has will greatly impact the generator size you need. Consider your RV's dimensions and the AC unit's BTU rating when making your decision.

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Choosing the right generator is crucial for powering your AC in your RV. A 50amp generator can run various appliances, but you need to determine what appliances it can handle.

Generators come in capacities ranging from 288Wh to 3600Wh, but some portable power stations can expand to 25kWh with smart extra batteries and linking multiple units. This expansion is a game-changer for RV owners who need a reliable power source.

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To choose the right generator, consider its capacity, recharge options, and weight. A generator with a higher wattage rating can handle multiple appliances, including your AC, without any issues. Recharge rates are also critical, as you don't want to be stuck recharging your generator for too long at the campground.

There are two main types of generators to consider: portable and standby. Portable generators are exactly what they sound like - generators you can transport from place to place. They're less expensive, but may not be the best option for larger AC units.

Standby generators, on the other hand, are installed outside your home and directly connected to your electrical system. They're also called "permanent" or "stationary" generators.

Here's a quick comparison of the two types:

Built-in vs portable generators - which one is right for you? Let's break it down.

Built-in generators are often found in motorhomes and can provide a convenient, self-contained power source. They're usually quieter and cleaner than portable generators.

Portable generators, on the other hand, are great for boondocking and RV parks without power hookups. They're also a good option for travel trailers and truck bed campers.

Here's a quick comparison of the two:

Keep in mind that solar-powered generators are another option, and they're becoming increasingly popular for their eco-friendly benefits.

To choose the right generator, first figure out what appliances you can power with it, such as lights, refrigerators, and air conditioners.

Appliances have wattage ratings, so you'll need to calculate the total wattage needed to power all your devices.

Consider the generator's capacity, which is the amount of electricity it can produce at once, and make sure it's higher than the total wattage of your appliances.

A generator with a higher wattage rating can handle multiple appliances without any problems.

Look at the recharge options, such as fuel, portable solar panels, shore power, and car adaptors, to determine how you'll keep your generator powered.

Some generators recharge quickly, while others take longer, so consider the recharge rate to avoid getting stuck recharging your generator for too long.

Finally, consider the weight of the generator, as it can impact portability and make it harder to move around.

Determining AC power requirements is crucial to choosing the right generator size for your RV.

To calculate your AC unit's wattage, first find its tonnage, which is usually listed in the operator manual or on the manufacturer's label.

You can also convert BTUs to tons by dividing the BTU number by 12,000 (1 ton = 12,000 BTUs). For example, a 42,000 BTU unit would be 3.5 tons (42,000 ÷ 12,000 = 3.5).

Multiply the unit's tonnage by 3,500 (1 ton = 3,500 watts) to get its starting wattage. For a 3.5 ton AC, the wattage would be 12,250 (2.5 x 3,500 = 12,250).

Note that starting wattage is normally 2–3 times higher than the unit's running wattage.

A standard 15,000 BTU AC pulls about 2000 to 3000 watts, while a small 2000 watt generator could run an AC unit as long as you're not powering anything else with that generator at that time.

Here's a rough guide to help you estimate the power requirements of your AC unit:

Keep in mind that starting wattage is crucial for an initial startup, and running wattage is the wattage an appliance needs for constant running.

To power your AC in your RV, you'll need to determine the size of generator you need. The size of the generator is determined by the wattage of your AC unit. To calculate the wattage, you need to find the tonnage of your unit, which is usually measured in tons or BTUs. A 1-ton AC unit is equivalent to 12,000 BTUs, so if your unit is measured in BTUs, you can easily find the tonnage by dividing the BTU number by 12,000.

Most RV air conditioners operate in the 1,200 to 1,500-watt range, but can surge to 2,000 watts or higher during startup. To be safe, you'll want a generator that can handle the surge power, so a 6,000-watt generator is recommended for two AC units.

A 50-amp RV requires an additional calculation because of the four-prong design, which can provide more electricity. A 50-amp service can supply a maximum power of 12,000 watts, which is pretty decent to run central air conditioning units, tankless water heaters, and other higher-wattage tools or appliances.

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Here's a rough estimate of the wattage requirements for different AC units:

Keep in mind that these are just estimates, and the actual wattage required may vary depending on the specific unit and your usage patterns. It's always a good idea to consult the manufacturer's specifications and to use a generator sizing calculator to ensure you're getting the right size generator for your needs.

The average home in Canada uses around 961 kilowatt-hours (kWh) per month, but when it comes to generators, you may only need enough power to run your essential appliances. For example, if all you want to do is keep some lights and a television on at night while you sleep in your camper, then a 2,000-4,000 watt generator may be adequate.

NEVER USE A GENERATOR IN AN ENCLOSED SPACE. NEVER RUN A PORTABLE GENERATOR INSIDE OF AN RV, as this can lead to carbon monoxide poisoning and death.

Always set up a portable generator at least 20 feet away from your rig, with the exhaust pointing away from camp.

Don't operate a generator in the rain - it's that simple. Simple boxes and tarp-tents can be constructed to protect generators from the elements.

Turn off your generator and let it fully cool down before refueling. This is a good best-practice for all motors.

Do not touch a running generator. Many components of a generator heat up during operation, which can lead to nasty burns when touched.

A generator is a powerful machine, and it's essential to treat it with respect.