The ideal generator size for your travel trailer AC hinges on the startup wattage of your air conditioner, typically requiring a surge much higher than its running wattage. Most travel trailers need a generator that can provide at least 3,000 watts to handle the AC startup, but a larger generator might be necessary for running other appliances simultaneously.
Understanding Your AC Power Needs
Determining the correct generator size involves understanding your air conditioner’s power requirements and any other appliances you plan to run concurrently. This calculation will prevent overloads and ensure a comfortable camping experience. Ignoring these details can lead to frustrating situations, damaged equipment, or even safety hazards.
Startup vs. Running Wattage: The Key Difference
The most crucial factor is understanding the difference between startup wattage (also known as surge wattage) and running wattage. Startup wattage is the momentary power surge required to start an appliance, especially those with motors like air conditioners. This surge can be significantly higher than the running wattage, which is the continuous power needed to keep the appliance operating.
- Air Conditioner: Usually requires a large surge upon startup. A 13,500 BTU AC unit, common in travel trailers, can require anywhere from 2,200 to 3,500 watts to start, but only 1,200 to 1,700 watts to run.
- Microwave: Another appliance with a significant startup surge, although less than an AC unit.
- Refrigerator: Similar to an AC unit, requiring a higher startup wattage than running wattage.
- Other Appliances: Lights, TVs, phone chargers, and small electronics generally have low startup wattage requirements.
Calculating Your Total Power Needs
To accurately determine the generator size, follow these steps:
- Identify the Startup Wattage of Your AC Unit: This information is usually found on the AC unit’s label or in the owner’s manual. If you can’t find it, err on the side of caution and estimate 3,500 watts for a 13,500 BTU unit.
- Determine the Running Wattage of Your AC Unit: This is the continuous power required to keep the AC running.
- Identify the Running Wattage of Other Appliances: List all other appliances you plan to run simultaneously with the AC and note their running wattage.
- Calculate Total Running Wattage: Add the AC’s running wattage to the combined running wattage of all other appliances.
- Choose a Generator with Sufficient Startup Capacity: The generator’s rated output should be able to handle the AC’s startup wattage plus the total running wattage of all other appliances.
Example:
- AC Startup Wattage: 3,000 watts
- AC Running Wattage: 1,500 watts
- Refrigerator Running Wattage: 200 watts
- Television Running Wattage: 100 watts
- Total Running Wattage (excluding AC startup): 1,800 watts
In this scenario, you would need a generator that can provide at least 3,000 watts (for AC startup) and handle the additional 1,800 watts of other appliances while the AC is running. A generator rated for 4,000 watts would be a safe bet, providing some headroom for unexpected power draws.
Choosing the Right Generator Type
Once you know the required wattage, you need to choose the right type of generator. There are two main types popular for travel trailers:
- Conventional Generators: Typically more affordable but also louder and heavier than inverter generators. They provide a consistent power output but can be less fuel-efficient.
- Inverter Generators: These generators produce clean, stable power, making them ideal for sensitive electronics. They are quieter, more fuel-efficient, and often lighter than conventional generators, but they tend to be more expensive. Many inverter generators can be linked in parallel to double their power output. This makes them perfect for providing the needed power for your travel trailer AC.
For travel trailers, inverter generators are generally preferred due to their quieter operation, clean power output, and portability. This is especially important in campgrounds where noise levels are often regulated.
Frequently Asked Questions (FAQs)
Here are some common questions about choosing a generator for your travel trailer AC:
1. What happens if my generator is too small?
If your generator is too small, it won’t be able to handle the startup surge of your AC unit. This can cause the generator to overload, potentially damaging the generator and your appliances. At the very least, the AC unit won’t start.
2. Is it better to have a larger generator than I need?
While a larger generator offers more power and prevents overloading, it also comes with drawbacks. Larger generators are typically heavier, less fuel-efficient, and more expensive. It’s best to choose a generator that meets your needs without being excessively oversized.
3. Can I use a portable power station (battery) instead of a generator?
Portable power stations can be a viable alternative, but they have limitations. They need to have a sufficient capacity (measured in watt-hours) and a high enough output wattage to handle your AC’s startup and running needs. These can be very costly. It’s crucial to check the specifications of the power station to ensure it can meet your requirements, considering recharge times and overall lifespan.
4. How do I reduce the startup wattage of my AC unit?
Some AC units have a soft start feature, which reduces the initial surge of power needed to start the unit. If your AC unit doesn’t have this feature, you can install an aftermarket soft start device to minimize the startup wattage and potentially use a smaller generator.
5. What is the difference between running watts and peak watts (or surge watts)?
Running watts represent the continuous power output a generator can provide for sustained operation. Peak watts (or surge watts) indicate the maximum power the generator can supply for a short period, typically for starting appliances with motors. Always ensure your generator’s peak watts are sufficient to cover the startup wattage of your AC unit and other appliances.
6. How does altitude affect generator performance?
At higher altitudes, the air is thinner, which reduces the engine’s power output. This means your generator may produce less wattage than its rated capacity. If you frequently camp at high altitudes, you may need to choose a generator with a higher wattage rating to compensate for the reduced performance.
7. Are there any quiet generators specifically designed for RV use?
Yes, many manufacturers offer inverter generators specifically designed for RV use. These generators are generally quieter, more fuel-efficient, and lighter than conventional generators. Look for models with noise ratings below 60 decibels for a quieter camping experience.
8. Can I run my generator inside my RV?
Absolutely not! Generators produce carbon monoxide, a deadly gas. Never run a generator inside your RV or in any enclosed space. Always operate the generator in a well-ventilated area, away from windows and doors.
9. How often should I service my generator?
Regular maintenance is crucial for ensuring the longevity and reliability of your generator. Follow the manufacturer’s recommendations for oil changes, air filter cleaning, and spark plug replacement. A well-maintained generator will perform better and last longer.
10. What fuel type is best for my generator?
Most portable generators run on gasoline or propane. Gasoline is generally more readily available, but propane is cleaner-burning and has a longer shelf life. Some generators are dual-fuel, allowing you to switch between gasoline and propane.
11. Can I connect multiple generators together for more power?
Yes, some inverter generators have a parallel capability, allowing you to connect two identical units to double their power output. This can be a cost-effective way to increase your power capacity without buying a larger, more expensive generator.
12. How do I store my generator when not in use?
Proper storage is essential for preventing fuel degradation and corrosion. Drain the fuel tank or add a fuel stabilizer to prevent fuel breakdown. Store the generator in a clean, dry place, covered to protect it from dust and moisture. Consult your generator’s owner’s manual for specific storage instructions.
By carefully considering your AC unit’s power requirements, choosing the right generator type, and following these FAQs, you can confidently select the perfect generator for your travel trailer and enjoy comfortable camping experiences.