Home Outage & Backup
Solar Generator vs Gas Generator: The Honest Comparison
Gas wins on raw power and price. Battery wins on everything else. Here is exactly where each one falls apart, including the part that kills people.
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What's in this article
The generator started on the fourth pull. Everyone on the street heard it, and for about ten minutes you felt like the smartest person in the neighborhood.
Then it needed gas at 2am. And the stations were closed, or out, or had lines.
That is the whole comparison in one story. Gas gives you more power than a battery ever will. It also asks you for things at the worst possible time.
Where gas genuinely wins
Let's be fair, because a lot of battery reviews aren't.
Raw output. A mid-range gas generator makes several thousand watts continuously. Your central air, your well pump, your electric range — a big gas unit does those. Batteries in the same price bracket do not.
Unlimited runtime. As long as you can buy fuel, it keeps going. A battery holds what it holds and then it is a heavy box.
Price per watt. It is not close. Gas is dramatically cheaper for the power you get.
If your problem is "I need 5,000 watts for four days and I have a limited budget," gas is the answer. Say so honestly.
Where gas falls apart
That is not a minor asterisk. That is the reason a lot of people should buy a battery even though gas is cheaper.
Fuel you cannot get. When the grid goes down over a wide area, pumps do not work. The gas you need is in the ground under a station that cannot pump it.
Maintenance you will not do. Gas generators want oil changes, fresh fuel, stabilizer, and a run every few months. Most sit for two years, get pulled out during an emergency, and refuse to start. Ask anyone who has one.
Noise. Yours will run all night. So will your neighbor's opinion of you.
It cannot come inside. Which means extension cords through a window, which means a gap in your weather sealing during exactly the storm you are sheltering from.
Where battery wins
It works indoors. Silent, no exhaust, sits next to the bed. If you use a CPAP, this is not a convenience — it is the whole point.
It works instantly. Leave a LiFePO4 unit plugged in and it takes over the moment the grid drops. Your fridge never notices. No pull cord, no fumbling with a flashlight.
It needs nothing from you. No fuel, no oil, no annual ritual. Plug it in and forget it for three years.
It is not a fire risk in your garage. Storing five gallons of gasoline is storing five gallons of gasoline.
| Appliance | EcoFlow DELTA 21,024 Wh | EcoFlow DELTA Pro 34,096 Wh |
|---|---|---|
| Full-size refrigerator~150W running, cycles ~35% of the time | 17 hr | 66 hr |
| CPAP (no humidifier)~40W running | 22 hr | 87 hr |
| Gas furnace blower~400W running, cycles ~40% of the time | 5.4 hr | 22 hr |
| Well pump (1/2 HP)~800W running, cycles ~10% of the time | 11 hr | 44 hr |
Look at the well pump row. That is where batteries at normal prices stop and gas keeps going.
The cost math over ten years
Gas is cheaper the day you buy it. The gap narrows after that.
Over a decade you are buying fuel, oil, filters, plugs, probably a carburetor clean, and replacing the stabilized gas you forgot about. verify A battery costs you nothing after purchase until the cells wear out, and a LiFePO4 pack rated for 3,000 cycles will not wear out from four outages a year. verify
Whether that closes the gap depends entirely on how often your power actually goes out. Four times a year, gas is still cheaper. Twice a decade, the battery you never maintained wins easily.
What we would not buy
Do not buy an open-frame contractor generator for home backup. They are cheap and they are unbearably loud. You will use it once, hate it, and leave it in the shed. Buy an inverter generator or don't buy gas.
Do not buy a small battery as a substitute for gas if you have electric heat or a well. A 1kWh unit is a wonderful thing and it will not solve those problems. Pretending otherwise is how people spend a thousand dollars and stay cold.
Do not buy a gas generator you will store in an attached garage with fuel in the tank. If that is your only storage, that is a real argument for a battery.
What we would actually do
Own both, if you can.
The battery lives inside, plugged in, doing the fridge and the phones and the CPAP silently. The gas generator lives in the shed for the heavy stuff and for recharging the battery when the sun doesn't show up.
If you can only own one, ask yourself one question: is your problem power, or is your problem duration?
Short outages and a normal house — buy the battery. Long outages, a well pump, or electric heat — buy the gas, and buy the CO alarm at the same time.
The picks, in detail
Specs come from data/products.json, so they're the same everywhere on this site.
EcoFlow
EcoFlow DELTA 2
The one most people should buy. It refills fast enough that a short sunny break between storm bands actually matters.
- Capacity
- 1,024 Wh
- AC output
- 1,800W
- Weight
- 27 lb
What's good
- Wall recharge is genuinely quick — useful when power flickers back for an hour
- LiFePO4 cells, so it tolerates being left plugged in for years
- Six AC outlets means no daisy-chained power strips on the kitchen counter
- Add an extra battery later instead of buying a whole second unit
What's annoying
- The fan is audible in a quiet bedroom at night
- 1800W ceiling rules out most space heaters and hair dryers
- Expansion batteries cost nearly as much as the unit itself
Who this is wrong for
Anyone who needs to power a well pump, an electric water heater or a central AC. It will not start them, and it is not a whole-home unit.
EcoFlow
EcoFlow DELTA Pro 3
Specs unverifiedThe first portable unit that can honestly claim to back up parts of a house, including 240V circuits.
- Capacity
- 4,096 Wh
- AC output
- 4,000W
- Weight
- 113 lb
What's good
- 240V output covers well pumps and some dryers, which almost nothing else portable does
- Pairs with a transfer switch so you stop running extension cords through a window
- Chains with extra batteries into genuinely serious capacity
What's annoying
- Costs about the same as a permanently installed standby generator once you add a transfer switch
- 113 lb means it lives where you put it
- The install to make it useful is an electrician job, not a weekend project
Who this is wrong for
Anyone who wants to move it more than once. It has wheels for a reason, and stairs will beat you.
Questions people actually ask
Is a solar generator as powerful as a gas generator?
Can I run a solar generator indoors?
Which is cheaper?
Can I have both?
How loud is a gas generator really?
Who wrote this
GreenCommuteGuide Editorial Team
Research and fact-checking
We research backup power the boring way: manufacturer spec sheets, UL and FCC filings, warranty documents, and the complaints buried on page four of the reviews. When we haven't tested something ourselves, we say so on the page instead of pretending.
- · Every spec on this site is checked against the manufacturer's current published documentation before publication
- · We do not accept payment for a rating, a ranking, or a positive verdict
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