A battery is a tank of electricity. A standby generator makes a new tank from gas while the fuel lasts.

Updated August 26, 2026 · The Home Backup

People cross-shop these products because both get sold as “home backup.” They are not substitutes. An expandable battery kit stores what you charged. An automatic standby generator converts propane or natural gas into watts for as long as the meter or tank cooperates. One is quiet and bounded. The other is loud and, if the fuel holds, long.

On this site the battery side of the comparison is the Anker SOLIX F3800 plus the 120 V cores that grow (BLUETTI AC200L, Jackery Explorer 2000 Plus). The generator side is informational. Jackery, BLUETTI, and Anker SOLIX do not sell traditional pad plants. We will not invent a Generac click ID so a table looks more complete. Cost of the engine path: whole-house generator cost. Hub: whole-house generators.

Anker SOLIX

F3800

Split-phase home hook. Heavy. Not a pad generator.

Capacity

3,840 Wh

Output

6,000 W

Surge / peak

9,000 W

Voltage

120 / 240 V

$2,199.98

Street price on the manufacturer page, August 26, 2026. Sales move.

See F3800 price

Finite kilowatt-hours versus fuel

The F3800 ships with 3,840 Wh. Usable energy is less than nameplate; plan conservatively. A refrigerator that averages 150 W while cycling might take on the order of 1–2 kWh per day. A 1,500 W space heater takes that same pack down in a couple of hours of actual run time. Extra modules stretch the tank. They do not fill it from a gas pipe.

A 10–12 kW air-cooled standby on natural gas is a different object. It can keep making watts overnight, in a blizzard, while you sleep, as long as the utility gas stays up and the unit exercises. Propane is the independent-fuel version of the same idea, with a tank gauge you own. Gasoline belongs on portables you stand next to, not on a plant you expect to start itself.

Recharge is how a battery pretends to be a generator, badly. Wall AC is fast when the grid flickers back. Portable folding panels are weather. A 200 W folder in decent sun might return on the order of 0.6–1.2 kWh in a day, not nameplate times eight. Winter haze cuts that again. If your outage is a multi-day ice storm with no sun, the battery math fails unless you already bought a large stack and a tiny load list.

Noise, exhaust, and neighbors

Battery inverters make fan noise. That is not silence, but it is not a 3,600 RPM engine five feet from a bedroom window. You can sit in the same room as a station, which is why people buy them for CPAPs and routers. You cannot sit in the same room as a standby generator, and code will not let you try.

Carbon monoxide is the portable-generator killer, not the battery killer. A pad plant still needs the distances to openings that your AHJ wrote down. Weekly exercise is how you learn whether the neighbors will live with the machine before the storm, not after. If an HOA already hates pad plants, a battery kit is not “the same backup, quieter.” It is a smaller, bounded backup that may be the only legal path on that lot.

Permits and the house hook

A station that only feeds extension cords is a consumer product. The moment you energize house circuits, you are in electrician territory. Inlet box plus interlock, or a listed transfer switch, is the legal pattern. A dryer-outlet cheat cord is how people burn down the service and injure lineworkers. We will keep saying that.

A standby generator is a permit from day one: pad, gas, ATS, inspection. That is why install often costs more than the unit. The battery path can stay cheaper if you keep it portable. The battery path becomes a project the day you want the refrigerator circuit to live in the wall during an outage. Budget the electrician either way if the house wiring is the point.

240 V and what still will not start

Many wells, dryers, and air handlers are 240 V. A 120 V Explorer or AC200L, even stacked to 8 kWh, will not feed those loads. The F3800 is the named SKU on this desk that speaks 120/240 V: 6,000 W continuous, 9,000 W surge, 3,840 Wh, 132.3 lb, LFP. That surge number is on Anker’s page. It is still not a 4-ton heat pump’s locked-rotor amps in every house. Confirm the load. Locked-rotor is why electricians size generators in kilowatts and still add lockout kits.

Central air, electric ranges, and tankless electric water are usually generator or “shed it” problems. A battery that can start a well may still empty itself keeping the well’s pressure tank happy plus a few lights. Voltage gets you in the door. Watt-hours decide how long you stay.

Winter

Ice storms are the honest test. Nights are long. Solar is weak. Space heat is the load people reach for and the load that ruins a battery plan. A standby on gas does not care that the driveway is glazed. A folding panel on that driveway does. If your region dies for three days at a time in January, and the house cannot lose heat, the engine is the tool. If your region dies for eight hours and you can close doors and wear a sweater, the battery is the tool.

Cold also changes charging behavior and can change how a lithium pack wants to accept current. Follow the manufacturer’s temperature limits. Do not store a 132 lb cabinet in an unheated shed and expect nameplate in a polar snap. LiFePO4 / LFP is the chemistry we prefer for home-backup cycling; it is not magic insulation.

1. List the outage you actually get — hours, overnight, or days — and whether HVAC is required.
2. Separate 120 V and 240 V loads. If 240 V is required, the 120 V cores are the wrong aisle.
3. Price the install, not just the box. Inlet versus pad-and-gas is the real fork.
4. Plan recharge or fuel. Panels for the battery path; tank or meter for the engine path.
5. Test once in daylight. Fridge start, interlock, and a labeled shed list.

• Finite kWh is not a moral failing. It is the product.
• Fuel runtime is not free. You own maintenance, noise, and the pad.
• Hybrids (battery plus a small gas unit, or battery plus panels) still obey surge and weather.
• Rooftop-tied Powerwall-class systems are a third category. We will not sneak them in.

Generator class notes: air-cooled vs liquid-cooled. If you only need a fridge, skip both heavy paths and read power stations for home backup.