A generator can cost anywhere from about $300 for a small portable unit to over $20,000 for a large whole‑house or commercial system, depending mainly on size, type, and installation needs.

Typical price ranges

  • Small portable generators (camping / light backup) : Roughly $300–$800 for basic 1–3 kW units that can run a few essentials like lights, phone chargers, and maybe a small fridge.
  • Mid-size portable generators (home backup) : Often $800–$2,300 for 4–8 kW models that can power more circuits or partial home backup during an outage.
  • Whole-house standby generators : The generator unit itself usually ranges from about $5,000 to $20,000+ depending on power rating (around 18–48 kW) and brand; many common home systems fall in the $5,000–$9,000 equipment range.

Installation and “real world” costs

  • For standby / whole‑house systems , installation (concrete pad, wiring, transfer switch, gas line, permits) can add another $5,000–$15,000 or more, so total project costs often land between about $10,000 and $30,000+ for a typical home.
  • For a commonly installed 22 kW home generator, many homeowners end up around the mid‑teens to mid‑$20,000s all‑in (equipment plus installation), depending on site conditions and local labor rates.

What changes the price most

  • Power capacity (kW) : Bigger generators that can run central AC, electric ranges, and whole‑home loads cost much more than units that just keep lights and a fridge going.
  • Type of generator : Portable units are far cheaper than permanently installed automatic standby systems; solar/battery “generators” can range from a couple thousand dollars for small setups to $25,000+ for large battery systems.
  • Installation complexity : Longer gas runs, panel upgrades, trenching, and strict local codes can dramatically increase total cost even if the generator itself is the same model.

Forum-style “real world” perspective

  • In electrician and homeowner discussions, it’s common to see entire‑house standby jobs being quoted at $10,000+ and up, and that’s often considered normal rather than overpriced in many regions.
  • Community advice often emphasizes sharing a clear budget range (for example, “$500,” “$2,000,” or “$20,000”) because recommendations vary hugely between “just keep the fridge on” and “run everything like normal.”

TL;DR :

  • Around $300–$2,300 : portable generators for basic to moderate backup.
  • Around $5,000–$20,000+ (generator) and $10,000–$30,000+ total: whole-house standby systems including installation, with typical home setups falling somewhere in the middle of that range.

Information gathered from public forums or data available on the internet and portrayed here.