The cost question asked one more way (“cost for” — the direct phrasing): this piece answers with the plainest possible numbers — the unit costs, the installed costs, the decade costs — in table-free prose, one paragraph per layer. The plain-number edition.

The Unit Costs (Plainly)

The portable classes: $300-700 (the 2,000-3,500W inverters and small portables), $700-1,300 (the 5,000-7,500W workhorses), $1,000-2,000 (the 9,000-12,500W big portables). The standby classes: $4,000-5,500 (the 14kW managed-essentials), $4,500-6,500 (the 18-20kW whole-house mainstream), $5,000-9,000+ (the 22-26kW+ large-home tiers). The rule of thumb: portable hundreds-to-couple-thousand; standby thousands-to-several.

The Installed Costs (Plainly)

The portable installation (the inlet-and-transfer safety setup): $500-1,500 by an electrician. The standby installation (the full project): comparable to the unit — a typical whole-house installation running $4,000-6,000 on top of the unit, the site variables (the panel, the gas, the permits) moving the number. The all-in installed standby: roughly $9,000-12,000 for the 20kW-class mainstream house.

The Decade Costs (Plainly)

The maintenance: $200-350/year dealer-serviced, roughly half DIY. The fuel: the outage-and-exercise reality — typically $150-400/year at natural-gas metering for a stormy region's usage. The decade's ownership total (maintenance plus fuel plus the occasional battery): roughly $4,000-7,000 — the number to add to the purchase planning. The grand decade total (installed plus owned): roughly $13,000-19,000 for the mainstream standby — the $100-160/month framing for the automatic-whole-house reality.

FAQ

How much does a Generac generator cost by itself? Portables: $300-2,000 by class. Standbys: $4,000-9,000+ by size — the 20kW whole-house mainstream at $4,500-6,500. The unit is roughly half the standby story; installation completes it.

How much does installation add? Portables: $500-1,500 for the inlet-and-transfer safety setup. Standbys: comparable to the unit ($4,000-6,000 typical) — panel, gas, siting, permits. The all-in 20kW-class standby: $9,000-12,000.

What does a decade of ownership cost? Roughly $4,000-7,000: the annual service ($200-350 dealer), the fuel reality ($150-400/year at gas metering), plus the occasional battery — adding to the purchase for the $13,000-19,000 grand total.

What's the monthly framing? The 20kW-class standby's decade total amortizes to roughly $100-160/month — the automatic whole-house reliability as a subscription-shaped number for the value comparison.

Reading the Numbers in Context

The plain numbers gain meaning in three contexts. Context one — the outage cost: what does a day without power cost this house? The spoiled food ($200-500 per fridge-freezer event), the burst-pipe risk (the winter nightmare in the thousands), the work-from-home lost income, the hotel nights — the preparedness buyer's arithmetic that justifies the standby's decade total in a single avoided event. Context two — the house value: the installed standby as the resale asset — the transferred warranty and the permanent installation adding modestly to the sale appeal in outage-prone regions (the value the appraisers increasingly recognize). Context three — the insurance discount: some insurers' standby discounts (the monitored-automatic systems reducing the claim risk — the per-year savings offsetting a fraction of the ownership cost, worth one phone call to ask). Three contexts, and the plain numbers become the decision numbers — the cost understood as the protection's price rather than the equipment's price. For the complete cost methodology behind these figures, the detailed cost breakdown in the series walks every layer.