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What Size Generator Do I Need for My RV? | Mortons on the Move

What Size Generator Do I Need for My RV?

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You need electricity to keep things running when you’re not hooked up to shore power, but how much? How many watts does it take to power up your AC or appliances? There are a few essential variables to consider when deciding what size generator for your RV.

Let’s find out more about generators and what they can or can’t handle.

What Is An RV Generator?

Most RVs have a few different ways to generate electricity. Onboard batteries are used to store energy but need outside sources to charge them. Most RVs get some charge from the RV engine or tow vehicle alternator. Many RV’s also have solar panels to replenish them. Another vital power source many RV’s have is a generator, which runs on gas, diesel, or propane and generates 120-volt electricity.

A generator is rarely an RV’s only power source, but in some ways, it acts as a safety net. It’s what makes an RV genuinely self-contained. When your batteries run down, you can turn to your generator when you aren’t hooked up to shore power. It will provide AC power immediately and reliably as long as it has fuel. It can also restore battery life.

Some RVs have built-in generators that run power-hungry air conditioner systems. If you don’t have one, it’s easy to put a portable generator into service as an additional power supply. You can also run more than one, in parallel, if you need.

Learn all about the generators by reading our Complete Guide To RV Generators.

RV Generator Sizes

To help you decide what size generator for your RV, let’s look at what’s out there.

Manufacturers usually rate generators in terms of the watts they generate. (Sometimes, you’ll see this listed as kilowatts instead.) Most RV generators fall within a range of 1,500 to 4,000 watts, which equals 1.5 to 4 kilowatts.

Here is a collection of the most popular and high-rated RV generators on the market.

Portable RV Generator Sizes

Standard sizes for portable generators for RVs are 2,000 to 4000 watts but can be as large as 12,000 watts. Bigger is better in some situations, but bigger also means heavier, less fuel efficient and noisier. No one wants to pack extra pounds on an RV unless it’s necessary.

Traditional-style construction generators are the most powerful and cheapest but shouldn’t be your first choice for an RV because they’re noisy, less fuel efficient and prone to power surges. Inverter generators are quieter and more efficient. They also have microprocessors that regulate their voltage and current to protect sensitive electronic devices like computers and cell phones.

Tip: Learn more about What Is An Inverter Generator?

Built-In RV Generator Sizes

Many larger RVs have built-in generators inside a compartment. They draw directly from the fuel tank or burn propane, and you can safely use them during transit. You can also program them to automatically turn on and off or integrate them into your appliances’ wiring systems. Sizes vary, but they’re usually at least 3,000 watts with a maximum of 12,000 watts.

Built-In 5500 watt Onan Generator

Wattage Size Selection

So, how many watts will you need?

Well, you won’t be running all your appliances and accessories on your RV generator at once, but you should know how much they use. Electric ranges and water heaters are major power hogs, requiring around 2,500 watts each. By comparison, a refrigerator uses 600 to 800 watts.

You will need to know these numbers to better select the appropriate generator size for your RV lifestyle.

What Size Generator Do I Need for a 30-Amp RV?

Some RVs have 30 amp electrical service, and others have 50 amp. The difference is how much power the RV can draw based on amperage and voltage. 

To determine this maximum amount, multiply the number of volts (120) by the number of amps (30). The total is 3,600, so a 3,600-watt generator is the biggest you can use.

Anything more significant would be overkill; it wouldn’t be dangerous to use it, but you don’t need it.

What Size Generator Do I Need for a 50-Amp RV?

Using that same formula, the magic number of maximum watts is 12,000. But you can easily get by with a generator much smaller than that. In fact, it would be hard to consume that much energy, even if you run everything at the same time. A more realistic range for a 50-amp RV is 4,000 to 8,000 watts.

Although the RV can draw this much power even a 2000 watt generator can be used on a 50 amp RV, you will just need to be aware that you will be power limited. If you exceed the power the generator can put out it will overload and shutdown the generator.

Portable Generator plugged into a 50 Amp RV

How Big of a Generator Size Do I Need to Run an RV Air Conditioner?

Whether it will run the AC is another critical factor in determining what size generator you need. In fact, many RVers have a backup generator, so they can run the AC when necessary.

It’s a fact of RV life that air conditioning units use a ton of power. A central AC system needs 1,300-4,000 watts, depending on the BTUs. For window units, it’s closer to 600 to 1,500 watts. The standard 15,000 BTU RV air conditioner draws around 2000 watts rbut may surge upwards of 3000 when starting.

Will a 2000-Watt Generator Run an RV Air Conditioner?

So, depending on the size of your AC system, a smaller generator, even a 2,000-watt one, might be able to do the job. This is provided, of course, that you aren’t trying to power too many other things at once.

An air conditioner uses electricity to run its fan and also its compressor. Sometimes it will seem like an AC is running just fine, and then the compressor comes on, and it shuts everything down. It indicates you don’t have enough power. 

Some people solve this problem by running two smaller generators in parallel. Doing so requires carrying twice as much weight on board. It also means twice the amount of fuel and double the noise.

Sometimes its the compressor kicking on that will overload the generator even if it can run the air conditioner. Some people install “Soft Starts” on their air conditioners to limit this startup draw an the generator can then start and run the air conditioner.

Other Considerations When Selecting an RV Generator Size

How many watts it puts out is just one factor in choosing a generator for your RV. Here are some other factors to consider besides what size generator you need:

Cost

For many RVers, price is essential. Expenses of RV living add up quickly, and you’re likely watching your budget closely and carefully. With that said, going cheap on a generator can mean having to spend more down the road to replace it with something more suitable.

Generally speaking, the bigger the generator, the more expensive it will be. High-wattage Onan generators for example can run from $3000 to over of $10,000.

Noise

Inverter-style generators are usually quieter because they’re inside an insulated casing. It’s designed to muffle that annoying whine of older generators. To keep peace with your neighbors – and to keep yourself sane – it pays to look for one that has a good noise rating.

And as a reminder, observe the generally accepted “quiet hours” whenever possible.

Weight (If Portable)

Keep weight in mind along with watts. As we said before, there’s a reason why lower-powered models like 2,000 and 2,200-watt generators are so popular. They’re relatively light, so one person can move them around, and they’re less likely to overload your RV.

Fuel Type

If your RV runs on diesel, it makes sense to get a generator that runs on diesel, too. That way, you don’t have to haul around an extra fuel container or make an extra run to the station. The same goes for gasoline.  

Another option is propane, which many prefer over gas and diesel. Others, however, would rather conserve it for other uses. Many manufacturers offer “dual fuel” capabilities that burn either gas or propane, which would be perfect if you want flexibility. 

Find the Best Size Generator For Your RV

Hopefully, after reading this article, you have fewer questions regarding what size generator to get for your RV. There’s a lot to consider when making such an important decision, so do your homework. It’s the only way to find out what’s best for your situation.

If you feel you need to understand more about RV Generators, head on over to The Complete Guide To RV Generators where we cover everything from generator types to troubleshooting and maintenance.

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Mortons on the Move

We are Tom & Caitlin Morton. We gave up the stationary life for one where we are constantly on the move. We live in a fifth wheel RV and travel with our two pups, Mocha and Bella. We enjoy hiking, biking, boondocking, videography, and upgrading our RV to suit our off-grid mobile lifestyle. Our goal is to share educational, entertaining, and inspiring content with our readers and viewers.

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