For homeowners preparing for power outages with generators, bigger is not always better.
One online discussion about choosing a portable generator for an all-electric home centered on a costly tradeoff: More wattage can mean more comfort, but it can also burn through fuel much faster.
Here's what to know
Before settling on a size, the person who started the r/Generator thread compared two options.
The original poster wrote: "I think a generator around 7500 watts is possible if I'm VERY careful with what breakers are on. Like if I have the HVAC on - nothing else but a few lights should be on. If the water heaters on, maybe some lights and a burner on the stove."
They were also considering whether a 10,000- to 12,000-watt unit would be needed to keep heat, lights, hot water, and limited cooking available through a multiday outage.
Because the home has no other energy source, the question felt more urgent. The house is fully electric, and the original poster said the HVAC system doubles as the heat source, adding, "We lost power last year in the middle of winter while it was 10 degrees Fahrenheit outside."
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Some commenters argued that going bigger was the safer choice. One commenter wrote: "Go big. No one has ever complained about having too big a genset, but plenty of people complain about having too small a one."
Not everyone agreed with that advice, though. Another commenter highlighted the tradeoffs that come with larger machines, including "the cost, noise, weight, fuel consumption of a large generator."
Generator sizing is not only about what a machine can power in theory — it is also about what a household can realistically afford to buy and keep fueled during an extended outage.
More background
A story shared in the thread brought that point home by describing one family's experience after Hurricane Helene. Even with a 5,500-watt continuous unit, they said the generator "Burned through their propane reserves in three days and then 10 gallons of gasoline per day [adds] up damn fast when there aren't any stations open for 70 miles."
A smaller unit can mean a lower upfront cost, less fuel use, and fewer stressful fuel runs when roads are blocked or gas stations are unavailable.
Instead of recommending more generator capacity, some people in the discussion suggested trimming demand during short outages. Their ideas included leaving washers and dryers off, skipping heavy oven use, and cooking with propane camp stoves or grills instead.
Some replies also said the actual load from certain appliances may be lower than feared. In particular, commenters noted that heat-pump HVAC systems may not pull maximum power nonstop and that a water heater in heat-pump-only mode might stay under about 600 watts.
What can be done?
Making an outage-priority list before buying can help avoid overspending. "It's better to have a more efficient generator with less things turned on for longer, then to have a huge gas guzzler for a few days," one commenter added.
In this case, the thread suggested separating essentials — heat, refrigeration, lights, and possibly fans or a well pump — from higher-draw conveniences that can wait.
That kind of load management can lead directly to savings. Choosing a smaller generator may reduce upfront equipment costs, and using fewer major appliances can stretch each tank of gas or propane further, which becomes even more important when fuel is hard to find.
The discussion also raised a separate issue with advertised runtime. The original poster noticed that some generators list operating times comparable to smaller models, but only at 25% load.
That means the real-world difference often depends on how lightly the generator will actually be used.
A unit that can safely and efficiently power essential circuits may be more practical than one that promises whole-house performance in every scenario.
Where can I learn more?
These stories explore the same backup-power decisions homeowners face during outages.
• In Texas, one homeowner found a 190-pound generator too heavy to handle alone overnight.
• This winter, homeowners are learning a generator will never give the quiet reliability of stored backup power.
• Many families are choosing to retire outdated backup generators instead of storing gasoline near home.
• Across the market, homeowners are starting to rethink old backup generators as batteries become more practical.
• As outages drag on, more households are choosing to ditch aging backup generators for solar-charged batteries.
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