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Standby Generator Guide

THE HOMEOWNER’S PLANNING DESK

Generator Ownership Cost Planner

Build an itemized 5-, 10- and 15-year budget with your own quote, fuel and maintenance assumptions.

Planning estimate

By Standby Generator Guide Editorial Team · Published October 5, 2026 · Updated October 6, 2026 · Method and source checks October 5, 2026

Planning estimate — confirm scope, prices and operating assumptions with qualified installers and fuel suppliers. Tools prepare questions and scenarios; they do not approve an electrical or fuel-system design.

Technical professional review pending.How this guide is reviewed

Prepared by our editorial research desk using linked sources. No licensed professional signoff or hands-on testing is claimed. See the review process and what remains to be reviewed.

Enter your own quote and budget. Use 0 for an item included elsewhere or deliberately excluded; the result is only as complete as these entries. Separate installation labor from equipment and ATS so bundled prices are counted once. Consumables should exclude anything already in your maintenance contract. The initial battery belongs in the initial quote.

Three layers of the ownership budget

Up front

Equipment + transfer + installation

Fuel work + permits + warranty

Each year

Maintenance + fuel + monitoring

Consumables + repair reserve

At intervals

Battery replacement cost

Count events through each horizon

Nominal planning costs at constant input prices. Avoid counting bundled scope twice. A repair reserve is not a prediction of failures.

How the ownership budget works

Initial cost = equipment + installation + permits + ATS/load management + fuel work + one-time extended warranty. Ongoing costs add maintenance, monitoring, consumables, your repair reserve, scheduled battery replacement and outage fuel.

Fuel = annual outage hours × consumption per hour × matching unit price. Battery replacements occur at each interval through the final year, including an event exactly at the horizon. Annualized cost is the nominal total divided by years. It is not a finance payment or a discounted present value.

The repair reserve is a budget, not a failure prediction. These scenarios assume constant prices and hours; exclude financing, inflation, major replacement, tax changes and salvage value. Add exercise fuel to consumables or your annual budget explicitly. Read the worked ownership guide.

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