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What Size Generator Do You Need?

Calculate the wattage needed for backup power during outages. Home essentials, whole-house, or jobsite.

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

भारत में

Inverter+battery: ₹15,000-40,000 (most common Indian solution!)। Generator: ₹30,000-1 लाख। AC needs: 2-3 kVA per 1.5 ton। Lights+fan+fridge: 1-2 kVA। Luminous, Microtek, Su-Kam: top inverter brands। Power cuts still common in many areas — inverter is essential Indian appliance।

Inverter vs Generator

Inverter: silent, automatic, low maintenance। Generator: higher capacity, fuel cost। Most Indians prefer inverter+battery for daily outages।

⚡ CalcWolf Insight

A whole-house standby generator (Generac, Kohler) installed with an automatic transfer switch is one of the highest-ROI home improvements in areas with frequent outages. It adds $3,000-5,000 to home value and is increasingly expected by buyers in storm-prone and rural areas.

Frequently asked questions
Which capacity?
Lights+fans+fridge: 1-2 kVA inverter। +AC: 3-5 kVA generator/heavy inverter।
Inverter or generator?
Daily outages 2-4h: inverter (₹15-40K)। Long outages/heavy load: generator।
✓ 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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