Summer heat can be brutal, and when the power goes out, a portable generator becomes a lifesaver, especially if you rely on air conditioning. But choosing the right generator for your small AC unit can be tricky. This guide will help you determine the appropriate generator size to keep you cool during an outage.
Understanding Generator Power Ratings
Before diving into AC unit compatibility, it's vital to understand how generator power is measured. Generators list two key ratings:
- Running Watts: This represents the continuous power the generator can produce. This is the crucial number for consistently running your air conditioner.
- Starting Watts (Surge Watts): This is the higher power needed to initially start the AC compressor. The generator must have enough starting watts to overcome this initial surge.
Your generator needs to have enough running watts to power your AC unit continuously and enough starting watts to initially activate the compressor. Ignoring starting watts can lead to the generator failing to start your AC or even shutting down.
Determining Your Air Conditioner's Power Requirements
The power consumption of your air conditioner is listed on a sticker usually located on the side or back of the unit. This sticker displays the amps (A) and volts (V). To calculate the wattage, use this formula:
Watts = Volts x Amps
For example, a 5-amp, 115-volt AC unit consumes 575 watts (115V x 5A = 575W). Remember, this is only the running wattage. The starting wattage is usually about 3-5 times higher. Therefore, a 575-watt running unit would likely require a starting wattage of at least 1725-2875 watts (575W x 3-5 = 1725W-2875W).
Finding the Right Generator Size
Once you've calculated the wattage requirements for your AC unit, select a generator with:
- Running Watts: At least equal to or slightly higher than the running wattage of your AC unit. Adding a safety margin of 20-30% is a smart move to ensure consistent performance.
- Starting Watts: Significantly higher than the starting wattage. A good rule of thumb is to have at least 3-5 times the running wattage available as starting watts.
Example: Using our 575-watt AC example, you should look for a generator with a minimum of 700-800 running watts and at least 2000-3000 starting watts.
Types of Generators to Consider
Several generator types can power a small air conditioner:
- Portable Generators: Ideal for occasional use and easy transport. Available in a wide range of wattages.
- Inverter Generators: These are quieter and more fuel-efficient, making them a premium choice.
Beyond Wattage: Additional Factors
- Fuel Type: Consider the availability and cost of gasoline or propane in your area when selecting a fuel type.
- Run Time: Check how long the generator runs on a single tank of fuel, ensuring sufficient power during outages.
- Noise Levels: Inverter generators are generally much quieter. If noise is a concern, consider this factor.
Conclusion: Choosing the Right Generator for Your AC
Selecting the correct generator size for your air conditioner requires careful consideration of running and starting watts. Don’t underestimate the starting wattage; insufficient power here is a common cause of generator failure. By following this guide and factoring in additional considerations, you can find the perfect generator to keep you cool and comfortable, even during a power outage. Stay prepared and stay cool!
