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What Size Generator Do You Need?

Built by Kevin Glover · @gloverbuilds · Verified formula

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

In this article

Generator Sizing
Generator Types

Dimensionamento

Some watts + maior pico de partida. Geladeira: 700W (partida 2.200W). Bomba d'água: 1.000W (3.000W). Luzes: 300-600W. Total essencial: 3.500-5.000W. Um gerador de 5.000-7.500W cobre necessidades básicas.

No Brasil

Marcas populares: Toyama, Branco, Honda. Inverter portátil: R$3.000-8.000. Convencional: R$2.000-6.000. Para áreas com apagões frequentes: investimento que se paga em conveniência e proteção de alimentos/equipamentos.

⚡ 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

Qual potência?▾

Essenciais: 3.500-5.000W. Com AC: 7.500W+.

Portátil ou estacionário?▾

Apagões ocasionais: portátil. Frequentes: estacionário com partida automática.

✓ Math logic verified against primary sources → See our verification process

Kevin Glover · @gloverbuilds

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 →