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Running Caravan Air Conditioners: Generator Sizing & Setup

For running a caravan air conditioner, an inverter generator is the recommended choice. Unlike conventional generators, inverters provide "clean" power (a pure sine wave) that is safe for sensitive electronic components found in modern air conditioning units and other appliances. When selecting a generator, prioritize the following: Sizing (Wattage): Air conditioners have high "starting" (surge) watts when the compressor kicks in, which is often 3–6 times their running wattage. A generator in the 2.0kW to 4.5kW range is typically required to handle this surge comfortably. Always check your specific AC unit’s label for its starting and running requirements. Noise Levels: Since you will be using this at campsites, look for low-noise ratings. Modern inverter generators are designed to be significantly quieter than traditional open-frame models. Portability & Features: Features like wheels, handles, and remote or electric start can make daily use much easier. When selecting a generator for your caravan air conditioner, performance can be affected by more than just raw wattage. Here are the critical environmental and operational factors to keep in mind to ensure you have enough power when you need it most. Environmental Performance (De-rating) Generators produce less power in high heat, humidity, or at high altitudes. Heat Impact: As ambient temperatures rise, engine performance decreases. A good rule of thumb is to allow for a 1.5% decrease in output for every 5°C above 25°C. For example, on a 45°C day, your generator may output 6% less power than its rated capacity. Altitude: Operating at high elevations will further de-rate your generator’s output, meaning you should account for these drops when sizing your unit. Extension Lead Length In extreme heat, the length of your power cable matters. It is recommended to use a short lead (3–4 meters maximum) from the generator to your caravan. Using a longer cord can cause voltage drop, which may lead to issues starting your air conditioner's compressor. Factoring in Other Appliances Your generator needs to handle more than just the air conditioner. You must account for the total load of every device running simultaneously, such as: Battery chargers Refrigerators Lights and TVs If your generator is sized only for the air conditioner's surge, it will likely overload if you try to run your battery charger or other appliances at the same time. Recommendation Because of these variables, it is always a smart investment to opt for a generator with extra capacity beyond the peak draw of your air conditioner. This "headroom" ensures your system remains reliable, even on the hottest days or when you have multiple devices connected.

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Can I run a generator indoors?

No, you should never operate a generator indoors. Operating a generator inside your home, garage, basement, crawl space, or even near open windows and doors is extremely dangerous. Fuel-burning generators produce carbon monoxide (CO), a colorless, odorless, and tasteless gas that can be fatal in minutes. Why It Is Unsafe CO Buildup: Carbon monoxide accumulates rapidly in enclosed or semi-enclosed spaces. Because it is undetectable by human senses, it can overcome you before you realize there is a problem. Insufficient Ventilation: Standard home ventilation systems are not designed to exhaust the high volume of toxic fumes produced by a generator engine. Fire Hazard: Generators require significant airflow for cooling. Placing them in a confined area can lead to overheating and pose a serious fire risk. Safe Practices Outdoor Use Only: Always place your generator at least 6 meters (20 feet) away from your home, directed away from windows, doors, and air intakes. Install CO Detectors: If you use a generator, ensure you have battery-operated carbon monoxide alarms installed in your home. Keep It Dry: While generators must be outside, they should be placed on a dry surface and protected from rain or flooding using a specialized generator tent or canopy—never use an improvised cover that restricts airflow. If you are worried about power reliability and need a safe, indoor-friendly solution, have you considered looking into portable power stations (battery-based power banks)? These do not produce fumes and can be used safely indoors. We at the Generator Store offer a full range of generators and portable power stations.

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Best 2KVA Inverter Generator - Honda EU20i vs Yamaha EF2000iS

Fuel Efficiency: The Honda EU20i can run up to 4 hours at full load and a impressive 15 hours at 1/4 load (with eco throttle mode on), while the Yamaha EF2000iS can run up to 4.2 hours on a full load and 10.5 hours at a 1/4 load (with eco throttle mode on). Both the [...]

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Choosing the Right Generator

If you're looking for a generator, choosing the right generator is very important. Depending on how you will use your generator, there are different categories to meet your needs. This can include recreation, home standby and construction. The right generator size is the one that is correctly matched to power all the tools / appliances [...]

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Generator Power Management - Get More Power From a Smaller Generator

Power management is a great way to maximize the efficiency of your generator. Using power management can help you to use a smaller, less expensive generator to meet your needs, Use the generator more efficiently. Power management works because of one simple concept: it is not necessary to power everything at the same time. Switching [...]

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How do i choose a generator for my home?

No power at home from a storm or suffering from blackouts during summer, a generator can keep your house cool or warm, your fridges / freezers running and your computers and phones charged. Being prepared and having the right size generator is crucial to having the necessary appliances running while you have no power and [...]

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