Vs · Generators
A standby generator sits on a pad, ties to a transfer switch, and starts when voltage dies. A portable generator makes comparable watts for less money, then assigns every remaining task to you, carbon monoxide discipline included.
Summary
Standby vs portable generator comes down to one variable: who performs the transfer when the grid dies, an ATS in 10–30 seconds or a person in the driveway. Cost, fuel, carbon monoxide, and the legal house hook all follow from that answer. The comparison table below keeps the two classes, and the battery stations sold alongside them, from blurring into one product.
One search term covers three machines: an automatic standby on a pad, a wheeled gasoline generator, and a battery in a plastic case sold as a “solar generator.” Two of the three combust fuel; one of the three starts without a person present. This page keeps them apart, so you do not buy a quiet indoor-safe station when the job was a well pump, or a 7,000 W jobsite generator when the job was a fridge and a modem.
The Home Backup does not rank named portable gas SKUs or named standby plants with buy buttons. The featured partners here (Jackery, BLUETTI, Anker SOLIX) sell stations and expandable batteries, not pad generators. If the real question is battery versus a gas plant, use home battery vs standby generator. If automatic is already decided, go to standby classes and cost.
An automatic standby watches utility voltage. When the grid sags or dies, the automatic transfer switch (ATS) isolates the house from the utility, the engine cranks, and selected loads return; the typical window is 10–30 seconds, not zero. You can be asleep. You can be out of town. The plant still requires fuel, a healthy starting battery, and an exercise schedule. Automatic is a transfer switch plus an engine that was maintained; there is no third ingredient.
A portable does none of that until a person does it. Someone moves the machine outdoors with clearances, starts it, plugs a cord into a house inlet (or runs extension cords), and flips an interlock or a manual transfer switch to avoid backfeeding the neighborhood. If nobody can or should do that work in ice at 2 a.m., portable is the wrong class at any wattage printed on the box. That is the entire comparison.
| Standby (automatic) | Portable gas generator (manual) | |
|---|---|---|
| Start | ATS senses outage, typically 10–30 seconds | You roll it out, start it, plug the inlet |
| Fuel | Natural gas or propane (no jerry cans on the pad plant) | Gasoline and/or propane; gasoline goes stale |
| Circuits | Whole panel or a managed whole-home load | Inlet box + interlock, listed manual transfer, or extension cords |
| CO risk | Outdoor pad, still needs manufacturer and code clearances | High if used in a garage, porch, or too close to windows |
| All-in cost | Often $7k–$15k installed for a straightforward air-cooled job; more for liquid-cooled | Often $800–$4k for the machine plus a legal inlet — not “free watts” |
| Maintenance | Exercise, oil, dealer service | Same oil reality, plus storage, carburetors, and stale fuel |
| Who is the switch | The ATS | You |
The cost rows are order-of-magnitude US bands, not a bid. Two adjustments matter here. A portable priced at $800 is not $800 once an electrician installs an inlet, an interlock, and a correctly sized cord. A standby priced at $12,000 can still cost less than a week in a hotel plus a dead freezer plus a flooded basement, if those are real risks at your address. Plants bought for status rather than load are a separate finding; that argument lives on the cost page.
Combustion generators produce carbon monoxide; this row is not negotiable. Portable units kill people when run in garages “just for a minute,” in attached sheds, or near an open window that the wind then pushes indoors. Manufacturer clearance diagrams are the minimum; local code can be stricter. A battery-powered CO alarm is not a license to park a running engine at a bedroom wall. If anyone in the house cannot reliably keep a portable outdoors and pointed away from openings, do not buy a portable as home backup.
Standby plants still exhaust. They belong on a pad at the distances in the installation manual: openings, property lines, meters, and sometimes the neighbor’s bedroom window. A side-yard squeeze that “almost fits” is a failed inspection. Noise ordinances stack on top. Automatic does not mean invisible.
Fuel splits the classes again. US residential standby is almost always natural gas or propane. Natural gas requires no tank and often stays pressurized through the storm that killed the electric grid (common in wind events, guaranteed in none). Propane is on-site energy you own; you also own the tank level. Gasoline is the portable default: easy to buy, poor to store. It goes stale, varnish kills carburetors, and a five-gallon can is both a fire problem and a short runtime. Dual-fuel portables reduce the storage problem; they do not make you automatic.
The electrical product on the standby side is the automatic transfer switch, not the enclosure. A service-entrance ATS can move the whole house if the generator and gas line can feed it. A load-shed or managed-panel ATS keeps the engine in its class by dropping the large loads (range, second condenser, dryer) so the lights and the well stay up. That is licensed electrician work in almost every US jurisdiction. The buying guide walks the ATS types without pretending to be your inspector.
On the portable side, the legal house hook is usually an inlet box plus a panel interlock, or a listed manual transfer switch. The interlock is the sliding plate that physically prevents the utility main and the generator breaker from being on together; that is what keeps a line worker alive downstream. Extension cords to a fridge and a lamp are a smaller job, and they still require the generator outdoors. Do not backfeed a dryer outlet. Do not use a “suicide cord.” If either term is new, hire the electrician before you buy the engine.
Portable gas generators and portable power stations share an adjective and nothing else. Stations are batteries with inverters. The kits this site features use LiFePO4 / LFP chemistry. They have no exhaust; you can run one in a kitchen. They hold a finite number of watt-hours: a fridge overnight is a job in class, a well plus a heat pump for three days is not. Recharge is wall power when the grid flickers back, or portable solar panels in daylight. The aisle is portable power stations.
A gas portable has a fuel tank and an exhaust pipe; runtime is a fuel problem, not a watt-hour problem, and noise plus CO is the tax. If the comparison you actually ran was “quiet backup for the fridge,” the product was a station, not a jobsite generator on sale. Featured hops for that cart: Jackery, BLUETTI, Anker SOLIX. Split-phase without a pad: Anker SOLIX F3800. Hours of house essentials: power stations for home backup.
The flip condition is staffing, not wattage. If a capable adult is reliably on site and outages are rare, the portable column holds and saves thousands; remove that person, or add a well, a sump, or a medical load that cannot wait, and the decision reverses to standby regardless of price.
Do not run a portable generator in a garage, even with the door open. Do not treat a power station’s lack of exhaust as evidence it can impersonate a 20 kW plant. If this page already reads as too much process, an engine may be the wrong purchase; start at the station hub or home batteries. The Home Backup is not your fire marshal. Corrections: contact. How money works on this site: disclosure.
