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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

India

Lights+fans+fridge: 1-2 kVA। +AC 1.5T: 3-5 kVA。 +AC 2T: 5-7 kVA。 Inverter+battery (Luminous, Microtek): best for 2-4h outages (₹15-40K)。 Generator: ₹30K-1L for longer/heavier loads。 Diesel genset: apartment buildings standard。

Inverter First

Most Indian homes: inverter+battery sufficient. Generator only if 6+ hour outages or heavy AC load。

⚡ 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
For AC?
1.5T AC: minimum 3 kVA generator. 2T: 5 kVA。
Inverter or generator?
2-4h outages: inverter (₹15-40K). Longer: generator (₹30K-1L)。
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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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