RV Generator Buyer's Guide - How to Pick the Perfect RV Generator

Shopping for a new recreational vehicle (RV) is exciting. Comparing the features…Imagining the trips you’ll go on…Sharing your ideas with friends and family…

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Today’s RVs, whether they’re fancy motor coaches or simple campers, have a generous offering of amenities like stoves, refrigerators, air conditioners, etc. It’s a far cry from the early days of RV campers when all you had were a few lights powered by a coach battery.

To power all these modern comforts, you need an electric generator. This can either be a built-in RV generator or a regular portable generator used for camping.

In this RV generator buyer’s guide, we’ll dive into the need for an RV generator, the different types, and how to choose the best one for your vehicle.

Do I Need a Generator for My RV?

If you spent serious money buying a motor coach RV, which comes with all those shiny electrical appliances, you’re squandering your investment by not getting an RV generator.

Now, if you own a small, towable camper or travel trailer, you may be fine without a powerful generator, but you could still use some basic backup power at least.

Sure, onsite power is an option at many campsites, but not all. If you're planning on taking your RV off the beaten path, then you can't count on there being shore power. Ensure your independence with a generator. 

The first step in choosing an RV generator is distinguishing between the two types: built-in and portable.

Built-In RV Generators Vs Portable

If your RV or camper has a built-in generator compartment, then a built-in RV generator is the best option. This installed camper generator is hardwired to your vehicle's electrical system and started by the battery. Fuel comes right from your RV, so no need to refill a separate fuel tank during a rainy night.

RV generators are high-powered, typically offering at least 3,000 watts of juice. There’s no manual setup because they come with push-button-start from inside the vehicle. Many models can even adjust performance to altitude if you’re camping at high elevations, like the Rockies.

For those with a large Class A or Class C motor coach, built-in generators are certainly better, since a small portable one won’t handle everything you want to power. Yes, you can plug in a large, open-frame portable unit, but those weigh hundreds of pounds and are extremely loud.

The downsides are that built-in generators can be difficult or expensive to access, maintain, and repair. They also sit inside your RV and, although they exhaust outside, you should still set up a CO alarm in case of malfunction. In addition, keep your windows shut when running one to prevent exhaust from creeping back inside.

Portable generators eliminate these worries because they’re situated several feet away from your RV and can be easily accessed and maintained. Still, their smaller output and manual operation make them better for smaller Class B RVs or towable campers that lack their own fuel source. 

The following chart summarizes the key differences between built-in and portable generators:

BUILT-IN RV GENERATORS PORTABLE RV GENERATORS Integrated/Wired into RV Connected from Outside Automatic Setup, Push-button Start Manual Setup/Start Up to 12,000+ Watts of Power Up to 8,000+ Watts of Power Uses RV's fuel tank Requires separate fuel tank Difficult to Access/Maintain Simple Access/Maintenance Higher Risk of Exhaust Leaks Lower Risk of Exhaust Leaks  Typically Costs More Typically Less Expensive

Whether you choose a built-in RV generator or a portable RV generator, the most important step is to size it correctly.

What Size Generator Do I Need for My RV?

To size an RV generator, you need to figure out both its physical dimensions and electrical output.

1. Make sure your generator will physically fit into your RV. Take measurements in your RV generator's compartment to make sure you select one that will fit.

2. Determine your power needs. Add up the starting wattage requirements of every appliance you will run simultaneously. The total is the minimum wattage needed.

Your A/C unit will require the most power to run, and has a higher starting wattage requirement than running wattage. The number of air conditioners in your RV is therefore crucial to determining your power needs. For more information, read our article on powering an RV air conditioner.

Here is a list of common appliances and their average wattages:

Suppose you want to run an RV fridge, a coffee maker, a microwave, a portable fan, and a small tube TV simultaneously. If you add the starting wattages of those together on the chart, you'll get 2,620 watts. Any generator will need to handle at least that. For an idea of how many watts you may need, use our portable generator sizing calculator.

You should add about 20% to your maximum load. That way, your unit won't suffer the abuse of running nonstop at full power. In our example, you'd probably want at least a 3,200-watt generator. If you think you would ever want to run even more items, factor that into your calculations.

Some people ask how to size a generator for a 50-amp RV or a 30-amp RV. That's the wrong way to go about it.

A 50-amp RV requires a 12,000-watt generator to power everything at 240 volts and a 6,000-watt generator at 120 volts. Your RV may not have enough physical space to contain that large of a generator. That's why you should always start with physical dimensions and then figure out how much you really need to power at one time by adding up wattages. 

RV Generator Fuel Type

Built-in RV generators run on gasoline, diesel or propane. You should match your generator fuel type with that of your RV. In most cases, your built-in generator will pull fuel directly from your RV's tank until there's a quarter tank remaining (to prevent accidentally going empty).

For towable campers without their own fuel source, you may opt for a liquid propane generator. Otherwise, go with the fuel that makes the most economic sense where you live.

If you choose a portable generator, your options expand to include dual-fuel generators, which can switch between gasoline and propane for added flexibility. Just remember that portable generators will need an external fuel tank that you'll have to manage.

Owners of gasoline-fueled RV generators need to be aware of some crucial federal regulations which we'll outline in the next section.

Gas RV Generator EPA Regulations

According to the Environmental Protection Agency (EPA), gas fumes produced inside the tanks of built-in RV generators must be captured and returned to be burned. This has lead to the manufacturing of EVAP generators that are specially designed to meet these regulations.

Typically, motorized RVs already have a built-in system that complies with these regulations, but most tow-behinds don't. The towable RVs require that you install an EVAP generator, certified hose, special fittings, a specially designed metal tank, and a carbon canister.

If your built-in system is missing any one of these certified EVAP components, you'll be subject to a hefty fine should you get stopped and inspected. So unless your gas RV generator pulls its fuel from the chassis fuel tank, you'll want to be sure you're compliant on the roadway so you don't get stuck with a major fine.

Enjoy the Outdoors

At the end of the day, choose an RV generator that will be practical for your needs and won't get in the way of enjoying your trip. Focus on embracing the great outdoors and making every day an adventure out there.

If you need more help choosing an RV generator, call us at 1 (800) 800- to talk with an expert.

Whether you are a homeowner preparing for potential blackouts, looking to live off-grid, or need to power your devices while camping, RVing, or tailgating, having a generator on hand is essential. Generators help you run your most-needed devices when power is limited, and some even power the whole house.

The company is the world’s best Mobile Trailer Generator supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.

In this guide, we’ll cover what devices you can power, what fuel sources are required, the difference between whole-home and portable generators, and more. Here are the most important things to remember when shopping for a generator.

Types of Generators

In this section, we’ll cover the four main types of generators.

Home Standby Generators

A standby home generator is a heavy-duty device that gives your home backup power during an electrical outage. A whole-house generator is hardwired into your home. It should be installed by a professional so you can ensure it is set up in the proper location and follows local ordinances and noise restrictions. It is connected via a transfer switch and automatically kicks on in the entire home when there is a power outage. It turns off when it senses power has been restored.

Portable Generators

Portable generators can be used in any open space and are ideal for bringing with you on camping, hiking, or RVing trips when you only need to power a few devices. Portable generators come in various sizes, with larger models having more power than smaller models.

Portable generators usually run on gas and are less expensive than standby generators but can power fewer items. These generators typically run on extension cords unless you purchase a manual transfer switch.

Inverter Generators

An inverter generator is a type of portable generator that adapts to the power demand placed on it by throttling up and down. It utilizes sophisticated exhaust systems to run at a low noise level and is highly fuel efficient.

Solar Generators

A solar generator, which is a type of portable power station, operates like a large battery that charges by plugging into an outlet or via solar panels. It does not use propane or gas to power on and is typically lightweight and portable. Solar generators are ideal for use in a short time period and for powering a small number of devices at once, as they may have limited runtimes. Since they don’t have an engine, solar generators run quietly, which could be a benefit for those concerned about noise levels.

How Much Power Do You Need To Operate Devices?

One of the primary considerations when buying a generator is: what do you need to power? Depending on the size of your home and the number of devices you need to power, standby generators should have the amount of power you need for most, if not all, of your home appliances. In most situations, operating a 20kw generator should be enough to power the majority of your home devices.

However, if you’re operating a portable generator, you’ll need to consider the power requirements for the devices you want to use. Larger portable generators will be able to power more devices but will be harder to move around and more difficult to maintain.

“The larger the generator, the more it weighs, and the bigger it is, the more fuel it takes,” says Melanie Tydrich, a generator expert from Kohler. “Some people are going to say, well, I’m just going to get the biggest generator I possibly can, and then I don’t have to worry about it. But realize, if you do that, you’re going to be burning a lot more fuel, and it’s going to take up a lot more space.”

What size generator do you need? You can calculate your power needs by using something like the chart below, which gives you a general estimate of how much wattage everyday household items like a fridge, air conditioning unit, and washing machine use.

How To Operate a Generator Safely

While generators are useful, they are also potentially dangerous if proper precautions aren’t taken. Here are some safety tips to keep in mind to use a generator safely.

• Read the instructions from the owner’s manual carefully when operating a portable generator. Familiarize yourself with how to operate the generator before you need it so you’re completely prepared when the time comes.
• Use a fuel stabilizer when storing gas for an extended period of time. Unstabilized gas can become a fire hazard.
• Avoid refilling your generator when it’s hot or near warm objects to ensure you’re operating it safely.
• Connect your generator to a transfer switch to reduce the risk of getting electrocuted or damaging your appliances. When in doubt, call an electrician to install the transfer switch for you.
• Keep your generator at least five feet away from surrounding surfaces. This can help reduce the risk of overheating the items and causing them to catch fire.
• Never operate a gas generator in an enclosed area. This can lead to a buildup of carbon monoxide, which could be potentially lethal. Make sure you’re always operating your generator at least 20 feet from your home.

“If you’re running a portable generator, you’re going to have to take it out of storage, put it in place somewhere safe outside, away from intake vents and not on a screened-in porch,” says Tydrich. “Take that carbon monoxide seriously. […]Have a carbon monoxide detector in the home so if all else fails, at least you’ve got another backup. People don’t realize that it’s an undetectable gas until it’s too late.”

What Is a Transfer Switch?

Transfer switches safely connect your generator to a circuit panel via a cable and allow you to “switch” between grid power and generator power.

Automatic transfer switches come installed in standby generators and automatically switch between the power grid and generator power when they detect a blackout. Manual switches require you to switch over the power at the electrical panel yourself.

Without a transfer switch, portable generators need to run on extension cords, which can be hazardous and difficult to set up. Operating a generator with an extension cord means you can only operate devices running through an electrical outlet, not other units such as overhead lights or sump pumps. If you do run extension cords, you’ll need to ensure they are properly rated for the current they will be carrying.

Types of Fuel Used in Generators

Generators can run on gasoline, propane, natural gas, or solar energy.

Gasoline

Gasoline-fueled generators are the most common fuel source in a portable generator. When running a gas generator, it’s important to ensure you are prepared with gas ahead of time while also keeping in mind that it has a shelf life.

“During an outage, a lot of gas stations either don’t have gasoline, or they have really long lines,” cautions Tydrich. “If you’re going to store gasoline, you need to realize it has a shelf life. You need it to be fresh gasoline, and you’re going to need to go out and refuel it periodically.”

Propane

Propane is a clean fuel-burning source commonly used in standby generators. Some portable generators also use propane as a backup fuel source or connect through a propane tank. Propane is an affordable fuel option but is less efficient and powerful than other fuel sources.

Diesel

Diesel is another popular option for portable generators and can be stored for a longer period than gasoline. Diesel fuel also presents a lower fire hazard than gas, but it is used more often in industrial-style generators.

Natural Gas

Natural gas is exclusively used in standby generators and is a self-feeding fuel tied into a home’s natural gas line. The benefit of natural gas is that it can provide a nearly limitless fuel source, which means you don’t have to worry about running out of gas, diesel, or propane. However, it is less energy-efficient than other fuel types.

Solar

Solar generators use energy from the sun to back up your home via solar panels should you experience a power outage. Solar energy is completely free, clean, and energy-efficient, but if you’re planning on operating a solar generator, you should have a backup generator in place if needed. A battery backup like a power reserve can store energy and provide power to your home when in the event you can’t generate solar energy. You can also switch back and forth between solar power and another power source to help save energy and reduce energy costs.

How Much Should You Spend on a Generator?

The price point of a generator depends largely on what type you’re focusing on. Start with determining how much power you need and if you will be investing in a standby generator, or purchasing a portable generator, inverter, or solar generator.

If using a standby generator, you need to factor in installation costs in addition to the cost of a product, unless you are highly experienced in DIY. Your price may vary greatly depending on your property, and it’s best to consult with an expert beforehand to get an accurate estimate. New construction that can run a standby generator in an ideal location may have a much lower cost of in the ballpark of $3,000. However, some homes have complications that could increase the cost significantly.

Tydich explained some of the main factors that could increase the cost of installing a generator. “If you’re in a situation where there’s nowhere safe to place the generator near the home because you either have windows that people open, air intakes, or other kinds of complications,” said Tydich, “you may be running pipe and conduit to the other side of the property; there may be electrical system updates that need to take place, or you may not have natural gas or propane. The cost can really vary by thousands of dollars.”

Portable generators have a fixed price that depends largely on how much power the unit has and the type of fuel source. Portable generators can cost anywhere from a couple hundred dollars to upwards of $2,500 for higher-end models.

AC Generators vs. DC Generators

When shopping for generators, you may notice some listed as AC-powered and others as DC-powered. AC stands for “alternating current,” and AC units are the most popular model among household appliances. DC, which stands for “direct current,” is used more often in battery banks and backup units. If using a DC generator, you will need to convert it to AC to have usable power.

Other Generator Features

Performance, type, fuel source, and safety features are the most important factors when buying a generator, but many models also come with additional features that help them stand out. Here are some extra features you can look out for when choosing between the generators on the market.

Automatic CO Shutoff

Some generators have automatic carbon monoxide shutoff, which powers the unit down if it detects gas levels that could be fatal. This feature is common in most newer portable generator models, giving you peace of mind while operating the unit.

Electric Start

Many portable generators have an electric start feature, which lets you turn the generator on via a switch, remote, or push button instead of using a pull cord.

Low-Oil Shutoff

Some generators include low-oil shutoff, which means they automatically shut off when the oil reaches below a certain level. Keep an eye out for when your generator’s oil and filter need to be changed. If you aren’t comfortable changing it yourself, it’s always best to call in a professional.

Fuel Gauge

A fuel gauge allows you to easily track the fuel level and see when the fuel tank is getting close to running out. You only need this feature if operating a gas- or diesel-powered generator.

Noise Level

The noise level of a generator may be a factor if running it outside your home or campsite. Quieter generators run around 50-60 decibels, while louder generators can run as high as 90-100 decibels.

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