Pick a class of standby. The badge comes last.

Those top-ten lists rank ten nearly identical 22 kW boxes. The decision that actually specs a job is which class the house needs: air-cooled automatic, liquid-cooled, or a portable with a proper inlet. Get the class right and the quote, the gas line, and the inspection have somewhere to land.

The short version

• Best standby generator on this desk is a class, not a model: air-cooled automatic about 9-12 kW, liquid-cooled 20 kW and up, or a portable plus a legal inlet.
• No ranked trophy units, no generator hop, no invented install quotes.
• The cost page holds the invoice.
• The whole-house hub is the map.

Nobody here earns a penny if you buy a pad generator. Jackery, BLUETTI, and Anker SOLIX make batteries, not engines, so this page has no carts to push and no invented generator hop. Get the class wrong and the mistake runs four figures in either direction: a 10 kW machine that will never start the heat pump, or a liquid-cooled plant poured for a house that needed half of it. The money story, when you need line items, is the cost page. The map of this silo is the whole-house hub.

These rows are classes, not carts. Typical sizes are the bands installers actually quote. Your installer confirms kilowatts, fuel, and the transfer switch. That stamp is theirs.

Quick picks, by the house you have

• Most homes that can rest the A/C. Air-cooled standby, roughly 9–12 kW, on propane or natural gas with an automatic transfer switch. Lights, refrigeration, the well if it is in the load math, an air handler.
• Big homes, heat pumps, run-it-like-the-grid. Liquid-cooled, usually 20–24 kW and up. Quieter at the pad, built for longer duty, and a much bigger install.
• Rare outages, willing hands. A portable plus an inlet box and interlock. You are the transfer switch. The trade: standby vs portable. Cords versus inlet versus ATS: transfer switch.
• Fridge, CPAP, and Wi-Fi, with no pad at all. Leave this category. A quiet power station covers that, and the sticky on that aisle is the BLUETTI AC200L.

The classes, side by side

A class snapshot. Not a ranked model list, and not a buy button.

Class	Typical size	What it actually runs	Watch for
Air-cooled standby	About 9–14 kW (most quotes cluster 9–12)	The essentials plus some HVAC, with lockouts or load-shedding doing the diplomacy	Louder, shorter design life than liquid-cooled, and still a pad, a gas line, and a permit
Liquid-cooled standby	About 20–48 kW	Close to true whole-home, big heat pumps included, if somebody did the surge math	Install can outrun the equipment, and it wants space, airflow, and a serious gas service
Portable + inlet	3–10 kW, gasoline and/or propane	The circuits you pre-planned and labeled, no more	Manual start, carbon monoxide, stale fuel, and never a standby whatever the box says

Air-cooled engines shed heat with fins and a fan. Simpler, lighter on the pad, and the reason the 9–12 kW class is the default suburban answer. Liquid-cooled engines carry a radiator loop the way a car does: longer duty, lower sound at the property line, which is what the quote is really buying when both condensers and the well have to run at once. The premium arrives as concrete, gas pipe, and a delivery truck that needs a path to the backyard. We will not invent a unit price or an install quote for either class. That invoice lives on the cost page, and even there it is a map of line items, not a number we made up for your lot.

Square footage is not a kilowatt formula. A tight 1,800-square-foot heat-pump house can demand the liquid-cooled class. A drafty 3,000-square-foot gas-furnace house that locks out the A/C can live on air-cooled. The load list does the ranking. Write it before a dealer writes it for you: buying guide.

Who this fits

• You will accept a load-shedding module, or the second condenser can sit out the storm.
• Automatic start matters more than running absolutely everything.
• The gas meter or propane tank can genuinely feed the machine. Ask early.
• You want the standard install: one pad, one transfer switch, one annual service.

Who should skip

• The house must behave like the utility for days, heat pumps and all.
• Noise at the property line is already a sore subject on the street.
• The budget covers the install and a gas service that will not starve a big engine.
• Managing breakers mid-storm is not going to happen, and you know it.

How we know: Specification / category analysis. Not a dealer quote sheet.

Price check: No featured SKU in products.json — VERIFY-AT-PUSH (not checked) — from merchant page / products.json; may change.

Limits: We did not run a hands-on lab on these units. Surge blanks stay blank where the maker never prints one clean figure. EcoFlow stays comparison-only (no hop). Disclosure mode is dormant — we do not claim commissions.

Altitude, motor-starting amps, exercise, oil

Nameplate kilowatts assume friendly air, usually near sea level. Climb a few thousand feet and the same machine is honestly smaller. Ask for the altitude derate in writing. A 4-ton heat pump’s starting surge can stagger a generator that passed the running-watts math, because starting current is a spike, not an average. A dealer who can talk soft-starts and load-shedding without reaching for the brochure is the dealer to keep.

“Whole house” was never unlimited. A managed panel that rests the range and both condensers is a valid, cheaper design. A plant that promises everything and then trips on the well-plus-heat-pump moment is a failed spec wearing a nice enclosure. Run the exercise schedule the manual asks for, usually weekly and under some load, and budget oil, filters, battery, and a service visit. Eleven months of neglect turns insurance into a project.

Placement belongs in “best” too. The perfectly sized machine in a side yard that violates window clearances or the noise ordinance is a red-tagged inspection. Local rules outrank every page on this site. When two quotes disagree by a whole class, the productive argument is the load list and the gas pipe, never whose badge is on the lid.

When the better buy hums

If the honest job is refrigeration, the network, some lamps, and a medical device, you do not have a generator problem. You have a watt-hour problem. That is the product our partners actually make: Jackery, BLUETTI, and Anker SOLIX, same price to you either way. For 240 volts without a pad, the named machine is the Anker SOLIX F3800. Stay on Anker SOLIX, not Anker.com retail. For hours of essentials: stations for home backup. Physics referee: battery vs standby.

If every load on your list is 120-volt and your outages are measured in hours, this category is the wrong aisle. Finding that out today is this page doing its job. Otherwise: size the class, then call two dealers and let them argue over your load list. Do not let either of them skip the install invoice.

Next: what it really costs · standby vs portable · buying guide