Why Buying the Right Generator Matters
A generator is one of the most important investments a homeowner can make — but only if it's the right one for your needs. Buy too small, and it won't power your essentials during an outage. Buy too large, and you've wasted money on capacity you'll never use. This guide walks you through everything you need to know before making a purchase.
Step 1: Determine How Much Power You Actually Need
The most critical spec on any generator is its wattage output. To size a generator correctly, you need to add up the wattage of everything you plan to run simultaneously. Here's a quick reference for common household appliances:
- Refrigerator: 600–800 watts (starting surge can reach 1,200W)
- Window AC unit: 1,000–1,500 watts
- Sump pump: 750–1,500 watts
- Lights (per bulb): 10–100 watts
- Electric stove burner: 1,500–2,500 watts
- Central air conditioner: 3,000–5,000 watts
Always account for starting (surge) watts — motors draw 2–3× their running wattage when they first kick on. Choose a generator whose peak wattage can handle the highest surge in your setup.
Step 2: Choose the Right Generator Type
Portable Generators
Portable generators run on gasoline or propane and are stored away until needed. They're cost-effective for occasional outages and for powering tools on a job site. The tradeoff: they require manual setup, outdoor operation, and regular refueling.
Inverter Generators
Inverter generators produce cleaner power (lower THD) that's safe for sensitive electronics like laptops and phones. They're quieter and more fuel-efficient than conventional portables, but generally offer lower wattage at a higher price point.
Standby Generators
Standby generators are permanently installed outside your home and connect directly to your electrical panel. They run on natural gas or propane and start automatically within seconds of an outage. Ideal for families who can't afford to lose power for medical, work-from-home, or business reasons.
Step 3: Pick Your Fuel Type
| Fuel Type | Pros | Cons |
|---|---|---|
| Gasoline | Widely available, lower upfront cost | Short shelf life, requires stabilizer for storage |
| Propane | Stores indefinitely, burns cleaner | Requires tank; less energy-dense |
| Natural Gas | Unlimited supply via utility line | Not portable; pipe installation required |
| Dual Fuel | Flexibility during shortages | Higher cost than single-fuel models |
Step 4: Key Features to Look For
- Electric start: Eliminates pull-cord hassle, especially important in cold weather.
- Automatic CO shutoff: A critical safety feature — carbon monoxide poisoning is a leading cause of generator-related deaths.
- Transfer switch compatibility: Ensures safe connection to your home panel without back-feeding the grid.
- Run time per tank: Look for at least 8–10 hours at 50% load for overnight coverage.
- Noise level: Rated in decibels (dB). Under 65 dB is considered quiet for a generator.
Final Thoughts
When shopping for a generator, resist the temptation to simply grab the most powerful or cheapest unit on the shelf. Match the generator to your specific needs: your essential appliances, your storage space, your fuel access, and how often you expect to use it. Taking the time to do this math up front will pay off every time the lights go out.