When it comes to purchasing a standby generator, one of the most important decisions you’ll make is choosing the right size. A generator that’s too small may not be able to power the essentials, while one that’s too large can be unnecessarily expensive and inefficient. Understanding how much power your home really needs is the first step in selecting a generator that delivers comfort, safety, and reliability during outages.
Why Generator Size Matters
Generator size is measured in kilowatts (kW), which indicates how much electrical load the unit can handle. An undersized generator can overload and fail when trying to power too many appliances. On the other hand, an oversized generator may consume more fuel and cost more than necessary. The goal is to match the generator to your actual household needs.
Identify Essential vs. Whole-Home Power
Start by deciding whether you want to power your entire home or just the essentials. Essential circuits usually include the refrigerator, heating or cooling system, sump pump, lighting, and medical equipment. A smaller generator, typically in the 7, 12 kW range, can cover these basics. If you want whole-home coverage, including air conditioning, laundry appliances, and multiple electronics, you may need a larger generator, ranging from 20 kW to 30 kW or more.
Calculate Your Power Requirements
Every appliance and system in your home has a wattage rating. Add up the total wattage of the items you want to run during an outage. Keep in mind that some appliances, like air conditioners and refrigerators, require extra power to start up, known as “starting watts.” A professional installer can calculate these load requirements accurately and recommend the right generator size.
Consider Your Future Needs
Think about any plans you have for your home in the coming years. Will you be adding a second air conditioning unit, finishing a basement, or purchasing new appliances? Choosing a generator with some extra capacity ensures it will continue to meet your needs as your household grows.
Professional Sizing is Key
While online calculators can give you a general idea, there’s no substitute for a professional load assessment. A licensed electrician or generator installer will evaluate your home’s electrical panel, appliances, and usage patterns to recommend the correct size. This ensures safety, compliance with local codes, and long-term reliability.
Conclusion
The right generator size means peace of mind when the lights go out. By carefully evaluating your home’s essential loads, considering future needs, and working with a professional, you can select a generator that keeps your household safe and comfortable during any outage.