Motorhome Generators – How to Choose the Best One for Your Campervan?

A motorhome generator is an essential power source for off-grid travel, ensuring you have electricity wherever you go. Whether you’re camping in a remote location, attending an outdoor event, or simply need backup power, a generator allows you to use your motorhome’s appliances without relying on campsite hookups. We’ll take you through how choosing the best motorhome generator depends on factors like power requirements, fuel type, and whether you prefer a portable generator for campervan use or a built-in model.

What is a Motorhome Generator?

One of the most popular motorhome appliances, a generator is a device that produces electricity to power appliances and devices in your campervan. It allows you to run essential equipment like air conditioning, refrigerators, and lighting, even when parked far from mains electricity. Whether you plan to take a short trip or extended stay, having a reliable power source makes off-grid camping much more comfortable.

There are two primary types of generators for motorhomes: portable generators and built-in generators. Portable generators can be moved, stored, and used outside the vehicle, making them a more flexible option. Built-in generators, on the other hand, are permanently installed and connected to the motorhome’s electrical system for a seamless power supply.

Why Do You Need a Generator for Your Motorhome?

A generator gives you power wherever you travel. It keeps your appliances running, provides backup power, and supports off-grid camping. Below are the main reasons why a generator is a great investment.

• Powering High-Wattage Appliances: Many essential motorhome appliances, like air conditioning units, microwaves, and coffee makers, require more power than a standard leisure battery can provide.
• Off-Grid Camping & Wild Camping: If you love exploring remote locations, a campervan generator lets you camp without relying on electric hookups.
• Emergency Backup Power: Unexpected power failures can happen, so a generator makes sure your essential appliances, including heating and medical devices, keep running.
• Charging Batteries & Devices: A portable generator for a campervan keeps your battery topped up and allows you to charge phones, laptops, and other electronic devices.
• Outdoor Events & Entertainment: Generators are ideal for festivals, group camping trips, and social gatherings, powering sound systems, projectors, and outdoor lighting.
• Heating & Cooling Systems: A campervan generator lets you run air conditioning in hot weather and heating systems when it’s cold, helping you stay comfortable in any season.

What Types of Motorhome Generators Are Out There?

There are a few different types of generators, each with different fuel sources and benefits. Understanding these options will help you choose the best motorhome generator for your needs. So, here’s a list of the different types:

Diesel

A diesel generator is powerful, fuel-efficient, and long-lasting. Diesel burns more slowly than petrol, making it a cost-effective choice if you travel often. Many larger motorhomes already have built-in diesel generators that draw fuel directly from the vehicle’s tank.

Petrol

Petrol generators are widely available, easy to refuel, and more affordable than diesel models. They are a popular option for portable generators for campervans, especially if you don’t travel very regularly. However, petrol burns faster than diesel, meaning you may need to refuel more often during long trips.

Propane

A propane generator is quieter and better for the environment than petrol or diesel models. Propane is widely available at campsites and produces fewer emissions, making it a cleaner energy option. However, these generators often have a lower power output, which may not be ideal for your high-wattage appliances.

Solar Panels

Solar panels provide an eco-friendly way to generate power for small electrical devices and charge leisure batteries. While they are great for low-energy consumption, they are not as powerful as most generators for motorhomes and are unreliable in poor weather. Many motorhome owners use solar panels alongside a traditional generator for ogod measure.

Electric

Electric generators are rechargeable units that provide clean energy without fuel emissions. They work well for short trips or running small appliances but require regular recharging. While electric models are quieter, they lack the power needed for energy-hungry devices.

Hybrid (Dual Fuel)

Hybrid generators offer the best of both worlds by combining two fuel types, such as petrol and propane. These generators provide greater flexibility, longer run times, and allow you to switch between fuel types based on availability. If you want a campervan generator that balances efficiency and versatility, this could be your best bet.

What Are the Differences Between Conventional and Inverter Generators?

A conventional generator produces electricity at a constant speed, regardless of how much power is needed. These generators tend to be noisier, heavier, and less fuel-efficient but are often more powerful. They are a good choice for running multiple high-wattage appliances simultaneously.

An inverter generator, on the other hand, adjusts its power output based on demand, making it quieter and more fuel-efficient. These generators produce cleaner electricity, which is safer for sensitive electronics like laptops and TVs. If noise and efficiency are your main concerns, an inverter is probably the best generator for you.

What Are the Differences Between Built-In and Portable Generators?

A built-in generator is permanently installed in a motorhome, providing a seamless and convenient power supply. These generators are ideal for larger vehicles and those who rely on continuous power. However, they do require professional installation and are more expensive than portable models.

Now, a portable generator for campervans offers flexibility and can be moved or stored when not in use. These generators are great if you only need occasional power or want a more affordable option. While they require manual setup, they are definitely more budget-friendly.

Pros and Cons of Having a Motorhome Generator Onboard

A campervan generator is a useful investment, but it comes with both advantages and disadvantages. Whether you choose a portable generator or a built-in model, it’s important to consider both the good and the bad. We’ll outline both below.

Pros:

• Convenience: A generator gives you power anywhere, making off-grid camping and long road trips much easier.
• Power on Demand: It allows you to run essential appliances like air conditioning, microwaves, and fridges without relying on campsite hookups.
• Backup Electricity: In case of battery failure or power cuts at a campsite, a motorhome generator ensures you have electricity.
• Greater Independence: You don’t have to rely on campsites with electric hook-ups, giving you more freedom to explore.
• Multiple Fuel Options: Some generators use petrol, diesel, propane, or even a hybrid fuel system, giving you flexibility.
• Supports Outdoor Activities: A generator is useful for running outdoor lighting, sound systems, and cooking equipment at events or gatherings.

Cons:

• Cost: High-quality generators for motorhomes can be expensive, especially built-in models.
• Noise: Some generators can be loud, which may disturb your camping experience or nearby campers.
• Fuel Consumption: Running a generator for campervan use requires fuel, which adds to your travel costs.
• Regular Maintenance: Generators need servicing, including oil changes, fuel refills, and cleaning, to keep them running efficiently.
• Storage Space: Portable generators take up storage space, which can be an issue in smaller vehicles.
• Environmental Impact: Fuel-powered generators produce emissions, making them less eco-friendly than solar panels or battery-powered alternatives.

What is the Motorhome Generator Capacity?

Generator capacity is measured in watts and determines how many appliances you can run at once. Most generators for motorhomes range from 2,000 to 12,000 watts. For most campervans, 3,000–4,000 watts is ideal.

What Size Generator Do You Need to Run a Motorhome?

Choosing the right generator size depends on the number and type of appliances you plan to use. If you have an air conditioner, microwave, and refrigerator running simultaneously, you’ll need a generator with a higher wattage, for example. Let’s look at some of the different elements you’ll need to consider:

1. Watts

Generator wattage determines how many devices you can power at once without overloading the system. Most generators for motorhomes range between 2,000 to 12,000 watts, but 3,000 to 4,000 watts is typically sufficient for most campervans. The best motorhome generator for you should match the combined wattage of your essential appliances to ensure smooth operation.

How Do You Calculate Watt Usage?

To calculate how many watts an appliance uses;
Watts x Run Time = Watts usage
Example: If your microwave oven has a wattage of 500 watts, and you use it for just 30 minutes, what is the watt usage?
Based on the formula listed above;
(convert the minutes to hours; 30 mins = 0.5 hours)
500 x 0.5 = 250
This means you need at least a motorhome generator of 250Wh capacity to power your oven.

2. Volts

Voltage measures the force at which electricity flows through your appliances. Most generators for motorhomes in the UK operate at 230V, but always check your appliances’ requirements. Ensuring your motorhome generator provides the correct voltage prevents electrical damage.

3. Amps

Amps determine the amount of electrical current your generator can provide. If your generator doesn’t supply enough amperage, appliances may not work properly. Matching your campervan generator with your motorhome’s electrical system ensures efficient and safe operation.

How Much Power Do Some Motorhome Appliances Need?

Knowing the power requirements of your appliances helps you choose the best generator for motorhome use. So, how much power do the typical appliances use? Here are a few estimated wattages:

• Air conditioner: 1,000 – 3,500W
• Refrigerator: 100 – 400W
• Microwave: 600 – 1,500W
• Water heater: 1,200 – 1,500W
• TV: 150 – 350W

How Much Power Do Different Classes of Motorhomes Need?

If you’re trying to work out which size of generator will work best, you first need to get an idea of how much power your motorhome needs. Of course, this depends on the type of motorhome you have (or plan to have in the future). Below, we’ve outlined how much power different motorhome classes typically require.

1. Class A Motorhomes

Class A motorhomes are the largest and most luxurious models, requiring the most power. They often have multiple appliances, such as ovens, air conditioners, and entertainment systems, increasing the wattage demands. We’d recommend a generator with 5,000 to 15,000 watts for this type of vehicle.

2. Class B Motorhomes

Class B motorhomes, also known as campervans, are more compact and have lower power requirements. Since they feature fewer appliances, a generator with 1,000 to 3,000 watts is usually sufficient. So, if you’re looking for the best camping generator in the UK for a small campervan, opt for an inverter generator for more efficiency.

3. Class C Motorhomes

Class C motorhomes are mid-sized and built on a truck or van chassis. They require a generator with 3,000 to 8,000 watts, depending on the number of appliances used. If you frequently use high-energy devices, choosing a generator with a slightly higher wattage is a smart choice.

Conclusion

A generator is a game-changer for off-grid travel, giving you the power to run essential appliances no matter where you are. Whether you opt for a portable generator for campervan trips or a built-in model, having reliable electricity can only enhance your camping experience. And, by choosing the best motorhome generator based on your power needs, fuel preference, and budget, you’ll enjoy a hassle-free and comfortable journey.

FAQs

Can you run a motorhome generator while sleeping?

Yes, but you must follow safety precautions to prevent carbon monoxide poisoning. Ensure your generator is placed outside, away from windows and vents, and use a carbon monoxide detector inside your motorhome. If possible, choose an inverter generator since they are quieter and more fuel-efficient for overnight use.

Can you run a generator while driving?

Yes, many generators can run while you drive, allowing you to power appliances like air conditioning and fridges. However, you should check your generator’s manual to confirm it’s safe to operate while the vehicle is in motion. Always ensure proper ventilation and secure fuel connections before driving.

Are motorhome generators loud?

Some generators are loud, but inverter generators and models with noise-reduction technology are much quieter. Noise levels depend on the generator’s size, fuel type, and design, so check the decibel rating before buying. If noise is a concern, look for a generator designed for quiet operation.

Can you run a generator in the rain?

No, running a generator in the rain can be dangerous due to the risk of electric shock. You should always use a generator cover or shelter to protect it from moisture while ensuring proper ventilation. Never operate a generator in enclosed or damp spaces without adequate airflow.

Does the generator charge the house batteries in a motorhome?

Yes, a generator can charge your house batteries if your vehicle has a built-in battery charging system. Just check your motorhome’s electrical setup to ensure the generator properly connects to the charging system.

Can you run an RV generator while plugged Into shore power?

Yes, but it’s generally unnecessary because shore power provides a stable electrical supply. If your motorhome has an automatic transfer switch, it will prevent both power sources from operating simultaneously.

How much does a generator for a motorhome cost?

The cost varies depending on the generator type, size, and brand. Portable generators for campervans can range from £200 to £2,000, while built-in models typically start at £1,000 and go up to £10,000. Inverter generators usually cost between £500 and £4,000.

How long does a generator last in a motorhome?

A well-maintained generator can last between 10,000 and 25,000 hours of operation in a motorhome. If you run it for five hours daily, it could last over 12 years with proper care. Regular servicing, oil changes, and fuel management extend the generator’s lifespan.

How much do motorhome generators weigh?

Portable generators typically weigh between 20 and 100 pounds (9 to 45 kg), depending on their wattage and design. Built-in generators are heavier, ranging from 100 to 400 pounds (45 to 180 kg). If weight is a concern, look for lightweight camping generators that are easy to transport.

How long can a motorhome generator run?

The runtime depends on the generator’s fuel capacity and efficiency. Portable generators  generally run between 8 to 20 hours on a full tank, while built-in models can run for days if properly maintained.

Is it okay to run a generator for Days?

Yes, but you must monitor fuel levels and allow the generator to cool periodically. Most manufacturers recommend shutting it down every 8 to 12 hours to prevent overheating and wear. Proper maintenance, such as checking oil levels and filters, helps prevent breakdowns.

Does a motorhome generator require maintenance?

Yes, regular maintenance is essential to keep your generator in good condition. Some good routine tasks include oil changes, spark plug replacements, fuel system checks, and air filter cleaning. Keeping up with maintenance prevents breakdowns and extends the generator’s lifespan.

Can a motorhome generator be repaired?

Yes, most generators can be repaired by a professional mechanic or technician. Simple issues, like loose connections or clogged filters, can often be fixed by the owner. For more complex problems, consult your generator’s manual or seek professional servicing

How to connect the motorhome generator?

First, place the generator in an open, ventilated area at least 5 feet away from your motorhome. Next, prepare an appropriate extension cord and make sure the generator is grounded before turning it on. Start the generator, then connect the power cord to the motorhome’s external power inlet.