Professional-use disclosure

Screening outputs, not approvals

Calculator results, reference values, guides, and Workspace reports are provided for informational screening. They are not engineering advice, not a code compliance determination, not an installer quote, not a fuel-delivery promise, and not a guarantee of runtime or performance.

Code and authority having jurisdiction come first

Where this site discusses sizing, placement, or installation practice, ISO 8528 ratings, NFPA 70 Article 445, and NFPA 110 as adopted and amended locally, the authority having jurisdiction, and the equipment manufacturer instructions always govern. If a calculator result and a code rule disagree, the code rule wins. Generator installation and service work should be performed or supervised by qualified, licensed persons in accordance with local law.

Fuel, loads, and site facts must be verified

• Confirm the current fuel facts: fuel type and price, tank usable capacity, and delivery constraints.
• Confirm the load list: running kW, largest motor starting surge, and which loads run together.
• Confirm equipment facts: manufacturer fuel table, nameplate kW/kVA, voltage, duty rating, altitude and temperature derates.

No conflicts, no paid placement

Calculator defaults and guide examples are editorial choices, not endorsements. The site does not accept payment to favor equipment, installers, lenders, or rate plans in its tools or content. If that ever changes for a specific page, the relationship will be stated on that page.

Corrections

If a page contains an unclear definition, a broken result, a stale rate, or missing source context, send the URL and the specific issue through Contact. Verified corrections are applied and noted. Contact the site.