what size generator to run 2 refrigerators

3 min read 23-12-2024

what size generator to run 2 refrigerators

Choosing the right generator to power two refrigerators requires careful consideration of several factors. This guide will walk you through the process, ensuring you select a generator that meets your needs reliably and efficiently. Knowing the wattage demands of your refrigerators is crucial to avoiding power outages and protecting your valuable food.

Determining Refrigerator Wattage

Before you start shopping for a generator, you'll need to know the wattage of each refrigerator. This information is usually found on a sticker located on the inside of the refrigerator or in the owner's manual. The sticker typically shows the amps (A) and voltage (V). To calculate wattage (W), use this formula:

Wattage (W) = Amps (A) x Volts (V)

Remember, this is the running wattage. Refrigerators also have a higher starting wattage, often 3-5 times the running wattage, needed to initially power the compressor. This surge is crucial to consider when selecting a generator.

Example:

Let's say Refrigerator A draws 5 amps at 120 volts, and Refrigerator B draws 6 amps at 120 volts:

Refrigerator A: 5 amps x 120 volts = 600 watts (running)
Refrigerator B: 6 amps x 120 volts = 720 watts (running)

Therefore, the combined running wattage is 1320 watts. However, don't forget about the starting wattage. Assume a 3x surge for both:

Refrigerator A Starting Wattage: 600 watts x 3 = 1800 watts
Refrigerator B Starting Wattage: 720 watts x 3 = 2160 watts

This means you'll need a generator that can handle at least 2160 watts, or ideally more to account for additional safety margin.

Generator Size Considerations

Now that you know the wattage requirements, it’s time to choose a generator. Generators are rated in watts, and there are two main types to consider:

Running Watts: The continuous power the generator can provide.
Surge Watts: The peak power available for startup.

You need a generator with surge watts sufficient to start both refrigerators simultaneously. Running watts need to cover the combined running wattage. Aim for at least 20% more capacity than the calculated total wattage to prevent overloading and ensure smooth operation.

Choosing the Right Generator:

For our example with a combined starting wattage of 2160 watts and combined running wattage of 1320 watts, a 3000-watt generator (or higher) would be a safe bet. This provides ample surge capacity to start the refrigerators and sufficient running wattage to keep them running consistently.

Additional Factors to Consider

Other Appliances: If you plan to run other appliances simultaneously (lights, a freezer), you'll need a larger generator. Calculate the wattage of each additional appliance and add it to the total.
Fuel Type: Consider the availability and cost of fuel for your chosen generator. Gasoline generators are commonly available but require more frequent refueling than propane or natural gas generators.
Generator Type: Portable generators are convenient for temporary use, while standby generators provide automatic backup power during outages.
Safety: Always follow the manufacturer's instructions for safe operation. Never overload a generator, and ensure proper ventilation.

Frequently Asked Questions (FAQs)

Q: Can I use a smaller generator if I start the refrigerators one at a time?

A: While technically possible, this is not recommended. The constant starting and stopping can put a strain on both the generator and the refrigerators, potentially shortening their lifespan. Furthermore, you need to time this precisely to avoid loss of cooling.

Q: What happens if I use a generator that's too small?

A: A generator that's too small will likely trip its overload protection or, worse, damage the generator itself. Your refrigerators may also cycle on and off, compromising food safety.

Q: Where can I find a generator that meets my needs?

A: Many home improvement stores, online retailers, and generator specialists offer a wide variety of generators. Compare models based on wattage, features, and price to find the best fit.

By carefully following these steps, you can ensure you select the appropriate generator to power your two refrigerators reliably during a power outage. Remember that safety and proper sizing are paramount for both your appliances and your peace of mind.