Common Indian Appliance Power Ratings
Use this chart to estimate your total load (Watts) for the calculator.
| Appliance | Avg. Watts |
|---|---|
| Ceiling Fan (Standard) | 75W |
| Ceiling Fan (BLDC) | 35W |
| LED Tubelight / Bulb | 20W / 9W |
| Wi-Fi Router | 15W |
| Laptop Charging | 65W |
| LED TV (43-55 inch) | 80W - 120W |
| Desktop PC (Standard) | 250W |
| Gaming PC | 450W+ |
| Mixer Grinder | 500W - 750W |
How is Inverter Backup Time Calculated?
The backup time of an inverter or UPS is determined by the battery capacity (measured in Ampere-hours or Ah) and the total load connected to it. The formula used is:
Backup Time = (Battery Volt x Battery Ah x Efficiency) / Load Watts
For example, a 150Ah Tubular Battery (12V) running a Ceiling Fan and TV (approx 150 Watts) with 80% inverter efficiency will last roughly 9.6 hours.
Why is my backup less than calculated?
In India, battery performance degrades over time. Old batteries (3+ years), sulphation, and low water levels in tubular batteries can reduce backup by 20-30%. Always maintain distilled water levels for maximum runtime.