Sylvie Willis
The fuel consumption of an RV generator depends on various factors, such as the size and type of generator, the load it is powering, and the duration of usage. For example, the Onan 4000 generator consumes approximately half to three-quarters of a gallon of fuel per hour, while the Onan 6000 generator may use up to 10 gallons of fuel over 15-18 hours with the air conditioning on. Additionally, factors such as the RV's fuel tank capacity and the generator's automatic shutdown point at around a quarter tank of fuel can influence fuel usage. Understanding these variables is crucial for estimating fuel consumption and ensuring a smooth and enjoyable RV experience.
| Characteristics | Values |
|---|---|
| Fuel consumption | 0.5-0.75 gallons per hour |
| Fuel tank capacity | 15 gallons |
| Additional fuel | 20 gallons in gas cans |
| Fuel cost | $2.00 per gallon |
| Generator runtime | 20 hours |
| AC usage | Daily, for many hours |
| Fuel gauge | Needle moves after 24 hours |
| Generator type | Onan 4000, Onan 6000 |
| Generator shutdown | Automatic at 1/4 tank |
| Fuel capacity (Class A Coachmen Pursuit) | 80 gallons |
| Fuel capacity (Class B+ Coachmen Cross Trail) | 31 gallons |
| Fuel capacity (Class C Coachmen Leprechaun/Freelander) | 55 gallons |
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What You'll Learn
The fuel consumption of an RV generator depends on the load
The fuel consumption of an RV generator depends on various factors, one of the most significant being the load or power draw. The load refers to the amount of electricity being demanded by the appliances and devices connected to the generator.
When an RV generator is running, it can consume around half a gallon of fuel per hour, but this may vary between 0.5 and 0.75 gallons per hour, depending on the load. This estimate assumes that the generator is not running continuously but is instead being used for specific needs, such as powering air conditioning or recharging batteries.
For example, an Onan 4000 generator owner reported that their generator consumed approximately 0.521 gallons of fuel per hour when running the air conditioning and other appliances for 20 hours. Another user with an Onan 6000 generator reported a similar fuel consumption rate of around half a gallon per hour, but this was for a shorter duration of 15-18 hours per day.
It's important to note that the load on an RV generator is not static. The power draw can fluctuate as different appliances and devices are turned on and off, or as their own power requirements vary, such as an air conditioner cycling on and off. Therefore, it can be challenging to determine the exact fuel consumption of an RV generator, and it may be best to monitor your generator's fuel usage over time to get a more accurate estimate for your specific setup.
Additionally, the size and type of RV generator, as well as personal usage habits, can also impact fuel consumption. Some RVs may have larger fuel tanks, allowing for longer periods of generator usage before refuelling is required. Ultimately, the fuel efficiency of an RV generator will depend on a combination of factors, including the load, generator specifications, and individual usage patterns.
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The generator's run time
The runtime of an RV generator depends on several factors, including the size of the generator, the load it is powering, and the type of fuel used.
For example, the Onan 4000 generator consumes approximately half to three-quarters of a gallon of fuel per hour when running. This equates to about 90 miles per gallon if driving with the generator operating. On the other hand, the Onan 6000 generator consumes around half a gallon of fuel per hour, but this may vary depending on the load.
Some RV generators have safety features that automatically shut them down when the fuel level reaches around a quarter of a tank. This ensures that there is still enough fuel to drive the RV and prevents the tank from being completely emptied.
The runtime of an RV generator can also be affected by the user's habits. For instance, some people may only run the generator when necessary, such as for specific tasks like air conditioning or recharging batteries, while others may allow it to run continuously. Additionally, the climate and temperature can influence the runtime, as generators may need to run more frequently or for extended periods in hotter weather to maintain a comfortable indoor temperature.
In general, it is recommended to start with a full fuel tank when dry camping or boondocking for multiple days to ensure sufficient runtime for the generator.
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Fuel tank capacity of the RV
The fuel tank capacity of an RV varies depending on the RV's size, weight, and engine capacity. RVs typically fall into three main categories: Class A, Class B, and Class C.
Class A motorhomes are the largest and heaviest RV type, typically weighing between 20,000 and 50,000 pounds (9,000 to 22,700 kilograms). These vehicles can usually achieve around 8-10 miles per gallon (mpg) of fuel. Given that fuel prices in the US are currently averaging $1.03 per litre, filling a Class A motorhome would cost around $312 on average.
Class B motorhomes tend to have the best fuel efficiency, averaging approximately 18-25 mpg. Filling a typical Class B motorhome fuel tank would cost approximately $93.
Class C RVs are generally much smaller but still offer plenty of living space and can sleep between four and six people comfortably. These vehicles tend to weigh between 10,000 and 14,000 pounds (4,500-6,300 kilograms). Class C RVs can achieve slightly better mileage, usually between 10 and 14 mpg. On average, filling up a Class C motorhome would cost around $214.
It is recommended to keep your tank above a quarter full if you will be storing or leaving your motorhome idle for long periods during the winter. Additionally, it is possible to keep an emergency gas supply in your motorhome, but be mindful that gas can emit a strong odour, evaporate, and pose a safety hazard if it leaks.
The generator tank capacity in an RV can vary as well. For example, one RV owner reported having a 15-gallon generator tank and bringing an additional 20 gallons in gas cans for their 22-foot 1979 Tioga RV. Another RV owner with a larger seven-person RV recommended having at least 40 gallons of fuel.
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Cost of fuel
The cost of fuel for an RV generator depends on several factors, including the size and efficiency of the generator, the price of fuel, and the frequency and duration of usage. Here is some information on fuel costs for RV generators:
Fuel Consumption Rates
RV generator fuel consumption rates can vary depending on the generator model and usage patterns. Some generators consume around half a gallon of fuel per hour, while others may use up to three-quarters of a gallon or more. The load on the generator also affects fuel consumption, as running it at full load or with multiple appliances can increase fuel usage.
Fuel Capacity and Range
The fuel capacity of RV generators can vary. Some generators have tanks that hold around 15 gallons of fuel, while others may have larger or smaller capacities. The fuel efficiency and tank size determine the generator's range or how long it can run before refuelling.
Fuel Costs
The cost of fuel for an RV generator depends on the price of fuel, which can vary over time and by location. For example, with fuel priced at $2.00 per gallon, operating a generator that consumes 0.521 gallons per hour would cost approximately $12.48 for a 12-hour overnight stay. The cost of fuel can be a significant expense, especially for extended trips or frequent usage.
Fuel Efficiency Considerations
The efficiency of an RV generator can impact fuel costs. More efficient generators may have lower fuel consumption rates, resulting in cost savings. Additionally, some RVs may have features or settings that optimize fuel usage, such as running the generator only for specific needs like air conditioning or battery charging.
Fuel Transportation and Storage
When travelling with an RV generator, it is essential to consider how to transport and store extra fuel safely. Some RV owners bring additional fuel in cans, ensuring they have enough fuel for their trip. Safe fuel handling practices are crucial to prevent accidents or fires.
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The generator's shut-off point
The generator in an RV will automatically shut down when the fuel tank reaches around a 1/4 full. This safety feature ensures that there is still enough fuel in the tank to drive the RV and prevents the tank from becoming completely empty. The generator will not run if the fuel level falls below this point.
The shut-off point for an RV generator is an important consideration when planning a trip. It is recommended to always keep the fuel tank above 1/4 full to avoid the generator shutting off unexpectedly. This can be achieved by regularly monitoring fuel levels and refuelling when necessary.
Additionally, some RVs may have multiple generator switches located throughout, allowing for easy access to turn the generator on and off. It is important to be aware of these switches and their locations, as accidentally turning off the generator can be inconvenient and disrupt power to appliances such as the TV or air conditioning.
Furthermore, it is crucial to always shut off the generator when refuelling the RV. This safety precaution prevents any potential issues or accidents that may occur during the refuelling process. By following these guidelines and staying mindful of the generator's shut-off point, RV owners can ensure a safe and uninterrupted journey.
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Frequently asked questions
The fuel consumption of an RV generator depends on various factors, such as the generator's size and manufacturer, load, and usage patterns. While there is no exact answer, estimates range from 0.5 to 0.75 gallons per hour. Some generators may use up to 6 gallons per hour under certain conditions. It's important to monitor fuel levels and ensure the generator is shut off when not in use to prevent fuel wastage.
Fuel consumption can vary based on several factors, including the size and type of generator, the load it is powering, and the duration of usage. Environmental conditions, such as temperature and elevation, may also play a role in fuel efficiency.
To estimate fuel usage, consider the generator's specifications, its typical load, and your usage patterns. Some generators provide fuel consumption rates in gallons per hour, which can be multiplied by the expected usage time. Monitoring fuel levels before and after usage can also help refine your estimates.
To conserve fuel, operate the generator only when necessary. Use alternative power sources, such as solar panels, whenever possible. Maintain the generator regularly, as issues like clogged filters can reduce fuel efficiency. Consider investing in a fuel-efficient generator or using a pre-filter to reduce fuel consumption.
Yes, always ensure the generator is shut off when fuelling the RV to avoid any safety hazards. Generators should also be used and maintained in well-ventilated areas to prevent the buildup of flammable gasoline vapors. Regularly inspect and maintain your generator to identify any potential fuel leaks or mechanical issues.
