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What Size Generator Do You Need?

Calculate generator wattage needed based on the appliances you want to power during an outage.

📅 Updated April 2026 Formula verified 📖 4 min read 🆓 Free · No sign-up

Vatios Necesarios

Suma vatios de funcionamiento + el mayor pico de arranque. Refrigerador: 700W (arranque 2,200). Bomba de pozo: 1,000W (arranque 3,000). Calefacción: 700W (arranque 2,350). Luces: 300-600W. Total típico esencial: 3,500-5,000W de funcionamiento + pico de 5,000-7,000W. Un generador de 7,500W portátil cubre las necesidades básicas.

Tipos

Inverter portátil (2,000-4,000W): silencioso, $500-1,500. Convencional portátil (3,500-10,000W): más ruidoso, $400-1,200. Standby (7,500-22,000W): instalación permanente, arranque automático, $3,000-15,000.

⚡ CalcWolf Insight

The most dangerous generator mistake: running it indoors or in an attached garage. Carbon monoxide from generators kills 70+ people per year in the US. Run generators outdoors only, at least 20 feet from any door or window, with the exhaust pointing away from the house. Buy a CO detector for inside the house — they cost $20 and save lives.

Frequently asked questions
¿Qué tamaño para lo esencial?
5,000-7,500W para refrigerador + calefacción + luces + cargadores. Para AC central: necesitas 10,000+ W.
¿Portátil o standby?
Apagones ocasionales: portátil. Apagones frecuentes o necesidades médicas: standby con arranque automático.
✓ Math logic verified against primary sources → See our verification process
Kevin Glover
Founder, CalcWolf · GLVTS · Blickr
All formulas sourced from primary references — IRS publications, peer-reviewed research, and official standards. Results are tested against independent reference calculators before publishing. Rates and brackets updated when official sources change. Editorial policy →
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