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A 30W fan runs for about 17 hours on a 12 V 100 Ah battery. Backup-time tables for 100–200 Ah batteries, plus the formula to work out your own.

A 30 W fan uses about 11 units a month at 12 hours a day; a 75 W fan uses 27. Unit and rupee tables at 2026 tariff rates.

A 30 W inverter ceiling fan running 12 hours a day uses about 11 units a month. A conventional 75 W fan uses about 27 units, and a 95 W fan about 34 units, for the same hours. One...