Free Tool

Inverter Sizing Calculator

Not sure what size inverter or battery you need? Pick the appliances you want to keep running during a power cut and we'll suggest a starting point — then our team helps you get it exactly right, free of charge.

What do you need to run?

Set how many of each appliance you want backed up during a power cut.

LED Bulb

9 W each

4

Tube Light

40 W each

2

Ceiling Fan

75 W each

2

Television

120 W each

1

Wi-Fi Router

15 W each

1

Refrigerator

250 W each

0

Laptop

65 W each

0

Desktop PC

200 W each

0

Air Cooler

200 W each

0

Mixer / Grinder

500 W each

0

Water Pump

750 W each

0

Air Conditioner (1 Ton)

1200 W each

0
90 min
0 min90 min180 min

Recommended setup

Total connected load401 W

Inverter

700VA

560 W · 12V

Battery

150Ah

1 × 12V · ~90 min

Get exact sizing on WhatsApp

Inverter sized for ~35% more wattage than your load, battery ~20% over (≈85% efficiency) — so it holds up under startup surge and as batteries age. Call us for an exact, honest recommendation.

Recommended for your setup

A great-fit inverter and battery for your ~401 W load with about 90 min backup. Add them to your enquiry, or browse every matching size.

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Inverter & Battery Sizing Calculator | Nice Power System