Generators

The Ultimate Generator Buying Guide (2026)

Standby, portable, or inverter — here's how to size a backup generator correctly, what a transfer switch actually does, and the safety rules that matter most.

Verdict: For most homeowners who just want the fridge, some lights, and the internet running through an outage, a portable inverter generator in the 3,000–5,000-watt range paired with a properly installed transfer switch covers it without the five-figure cost of a whole-home standby system.

A generator purchase tends to get put off until the week of an outage, which is exactly the wrong time to be comparing specs under pressure. The good news: sizing one correctly isn’t complicated once you separate the real decision points — what you need powered, how it connects to your house, and how much convenience you’re willing to pay for.

Standby, Portable, or Inverter?

Inverter generators are a specific category of portable generator worth calling out separately: they produce cleaner, more stable electrical output and run quieter than a standard portable model, at a higher price per watt. They’re the right call if you’re powering sensitive electronics (laptops, modern TVs, medical equipment) or mowing down noise complaints matters — camping and tailgating are the classic use case, but they work fine for home backup too, generally at lower wattage ceilings than the largest standard portable models.

Sizing: What Actually Needs Power?

This is the step that saves the most money and the most regret. Don’t size for “everything in the house running at once” — size for what you actually want covered during an outage:

• Refrigerator: ~600 watts
• Window air conditioner: ~1,000 watts
• Sump pump: ~750–1,000 watts
• General lighting: 100–200 watts, less with LEDs
• Laptop/phone charging: minimal, but add it in

Most households land in the 3,000–5,000-watt range covering the essentials — refrigerator, some lighting, device charging, maybe a sump pump or window AC. Check your utility bill or your provider’s usage estimator for a more precise number if you want to size exactly rather than estimate. Whatever total you land on, add headroom rather than cutting it close — appliances often draw a brief surge above their steady running wattage when they first start.

Fuel: Gasoline, Propane, or Tri-Fuel

Most portable generators run on gasoline, which means stored fuel needs a stabilizer to stay usable and shouldn’t be kept for more than a season or two without rotating it. Standby units typically run on natural gas (piped in, no storage needed) or propane (stored in a tank, safer for long-term storage than gasoline). Tri-fuel portable models — able to run on gasoline, propane, or natural gas — cost more upfront but remove the single-point-of-failure risk of one fuel type running out during an extended outage.

The Transfer Switch: Not Optional

If you’re connecting a generator to your home’s wiring at all — rather than just plugging in a single appliance directly — you need a transfer switch, not an extension cord. A transfer switch isolates your home’s circuits from the utility grid while the generator is running, which protects both your equipment and, critically, any utility workers who might be working on lines near your home. Backfeeding power into your panel without one is dangerous and illegal — if the outage was caused by downed lines, an improperly connected generator can send electricity back up those lines and seriously injure a lineworker who has no reason to expect them to be live. This is a licensed-electrician job, not a weekend DIY project.

Safety Rules That Actually Matter

The Consumer Product Safety Commission estimates nearly 80 people die every year from portable generator carbon monoxide poisoning — these rules aren’t boilerplate caution, they’re the difference between a rule followed and a real death:

• Never run a generator indoors, in a garage, or in any enclosed space — even with doors open. Carbon monoxide builds up to fatal levels within minutes and gives no warning; it’s colorless and odorless.
• Keep it at least 15–20 feet from the house, positioned so exhaust doesn’t drift toward windows or doors.
• Look for a model certified to the current PGMA G300 or UL 2201 safety standard if you’re buying new — these include a CO sensor that automatically shuts the generator down before levels become dangerous, a feature that didn’t exist on most generators sold even a few years ago.
• Let the engine cool before refueling. Adding fuel to a hot engine is a fire risk.
• Store it with an empty tank, or with fuel stabilizer added if fuel has to stay in over the off-season.

Bottom Line

Most homes don’t need whole-house standby capacity — they need enough wattage to keep food cold, some lights on, and phones charged until the power comes back. Add up your real needs, budget for a transfer switch as part of the total cost (not an optional extra), and treat the carbon monoxide and backfeeding rules as non-negotiable rather than fine print. See our companion piece on whether a generator is actually worth the investment if you’re still weighing whether to buy one at all.

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