⚡ Free tool

Power Backup Calculator

Pick what runs during a power cut and how long you need it. We'll size the perfect inverter and battery for your load.

✔ Real discharge-curve sizing✔ Instant load sizing✔ No signup

1 · Home appliances

Ceiling fan

75W

0

LED bulb

9W

0

Tube light

20W

0

LED TV 43"

80W

0

Refrigerator

150W · cycles

0

Wi-Fi router

15W

0

Laptop

65W

0

Air purifier

50W

0

Air cooler

200W

0

Washing machine

500W · cycles

0

Water pump

750W

0

Microwave

1200W · cycles

0

AC 1.5 ton

1800W · cycles

0

Room heater

1500W · cycles

0

Geyser

2000W · cycles

0

Shop & office

Desktop PC

200W

0

Inkjet printer

60W

0

Laser printer

600W · cycles

0

Photocopier

900W · cycles

0

POS terminal

60W

0

Barcode scanner

10W

0

CCTV + DVR

60W

0

Deep freezer

300W · cycles

0

Coffee machine

1200W · cycles

0

LED signboard

150W

0

Sizing based on real discharge curves of 150Ah/200Ah tubular batteries. Cycling appliances (fridge, AC, geyser) are counted at typical average draw. Motor surge is not modelled — confirm your inverter's surge rating for pumps and compressors.