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Generator & Backup

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Backup Power, Compared

Six or seven decisions stand between a reader and the right purchase. Each page here takes one and settles it.

Disclosure: we earn a commission on purchases made through links on this page, at no cost to you. It does not affect what we recommend or what we say about it — how we are funded.

Jackery Explorer 2000 v2

Buying backup power is not one decision. It is a short sequence of forks, and getting stuck on any one of them stops the whole project. These pages exist because the forks are where people actually stall — not at "which model" but at "which kind".

The forks, in the order they come up

  1. 1Battery or engine? Portable power station vs generator is the first and most consequential fork, and the answer is decided by your surge loads and your outage length more than your budget.
  2. 2Portable or permanently installed? Portable vs standby generator. Above a certain price the portable machine stops being obviously the cheaper choice.
  3. 3Whole-home battery or generator? Home battery backup vs generator covers the installed-battery option, which is a different product from a portable power station.
  4. 4Inverter or conventional frame? Inverter vs conventional generator. Noise, fuel economy and power quality against watts per dollar.
  5. 5Which fuels? Dual fuel vs tri-fuel vs gas, with the per-fuel output penalties published side by side.
  6. 6Interlock or transfer switch? Interlock kit vs transfer switch — the connection fork, and the one with the biggest cost spread.
  7. 7Inlet box or transfer switch? Generator inlet box vs transfer switch, for people who have discovered these are not the same thing.

How these comparisons are written

Every one of them names the cases where each side wins, rather than declaring an overall victor. That is not fence-sitting. Most of these forks genuinely do have two right answers depending on one or two facts about your house, and a page that pretends otherwise is useless to half its readers.

Where a comparison involves products, both sides carry live prices and buy links, because a comparison that sends you away to search for the thing you just decided on has wasted your time. Where a comparison involves installation, we say plainly what is licensed work and what is not.

And where a figure is a manufacturer's claim rather than something independently verified, the page says so. We do not run a test lab — see our methodology — so every specification here is attributed to whoever published it, including the places where two published sources disagree.

The shortest version of all seven

If you only read one line of each

Battery vs generator
Surge loads decide it
Portable vs standby
Outage frequency decides it
Inverter vs conventional
Neighbor distance decides it
Dual vs tri-fuel
Having a gas line decides it
Interlock vs transfer switch
Who manages the load decides it
Inlet box vs transfer switch
They are not alternatives

That last one is the most common misunderstanding in this category: an inlet box is where the cord plugs in, a transfer switch is what stops back-feeding. A compliant setup usually needs both.

Picks

What to buy in comparisons

Each tile carries the top pick from that page with a live price, so you can act from here rather than having to read a review first.

Questions people actually ask

Is a power station or a generator better for home backup?

A battery is better for small loads, short outages and anyone who needs to run indoors or quietly. A generator is better for motor loads like well pumps and sump pumps, and for outages measured in days. The surge requirement of your largest load is usually the deciding fact.

What is the difference between an interlock kit and a transfer switch?

A transfer switch is a sub-panel with a fixed set of circuits fed from either source. An interlock kit is a plate on your existing panel that stops the main breaker and a generator breaker being on together, giving access to every circuit. The kit is far cheaper; the switch manages load for you.

Is an inverter generator better than a conventional one?

It is quieter, more fuel-efficient at light load and produces cleaner power, and it costs significantly more per watt. For a machine run a few days a year in a place where noise is not an issue, a conventional frame is often the rational buy.

Do I need both an inlet box and a transfer switch?

Usually yes, and this is a common misunderstanding. The inlet box is the weatherproof outdoor socket your generator cord plugs into; the transfer switch is what prevents your generator from back-feeding the utility. Some transfer switches include an integrated inlet, which removes the need for a separate box.

Is a whole-home battery worth it versus a generator?

An installed home battery is silent, maintenance-free and seamless, and it is substantially more expensive per kilowatt-hour of backup than a generator. It makes most sense where outages are short and frequent, where solar is already installed, or where running an engine is not practical.