Free Tool

Lithium Battery Backup Calculator

Add your appliances and backup hours — instantly compare every INTU lithium battery from 768 Wh to 2560 Wh and find the right capacity for your home.

All models plug into any 12V home inverter — the Home PSW 1100 has a pure sine wave inverter built in.

Ceiling Fan 55 W each

0

Tube Light 18 W each

0

LED Bulb 9 W each

0

TV — 42 inch 80 W each

0

Wi-Fi Router 10 W each

0

Laptop 65 W each

0

Refrigerator ~150 W avg

0

Custom Load watts

Backup Duration: 2 Hours

⚡ Live Power Requirement

How the Battery Backup Calculator Works

Backup time depends on two numbers: how much power your appliances draw (load, in watts) and how much energy your battery stores (capacity, in watt-hours). The formula is simple:

Backup hours = Battery capacity (Wh) ÷ Total load (W)

The INTU range covers 768 Wh (INTU), 1150 Wh (INTU Star), 1152 Wh (INTU+), 1280 Wh (Home PSW 1100 all-in-one), 1920 Wh (INTU X) and 2560 Wh (INTU Pro). So a typical night-time load of two fans and two tube lights (146 W) runs for about 5 hours on the INTU, nearly 8 hours on the INTU+, or over 17 hours on the INTU Pro. These 12V plug-and-play batteries connect one per inverter — so if you need more energy, you step up to a larger capacity rather than stacking multiple batteries. The calculator recommends the right size automatically.

Typical Appliance Power Consumption

ApplianceTypical powerOne INTU (768 Wh)One INTU+ (1152 Wh)One INTU X (1920 Wh)One INTU Pro (2560 Wh)
LED bulb9 W~85 h~128 h~213 h~284 h
Wi-Fi router10 W~77 h~115 h~192 h~256 h
Tube light18 W~42 h~64 h~107 h~142 h
Ceiling fan55 W~14 h~21 h~35 h~46 h
Laptop65 W~11.8 h~17.7 h~29.5 h~39.4 h
LED TV (42")80 W~9.6 h~14.4 h~24 h~32 h
Refrigerator (avg)150 W~5.1 h~7.7 h~12.8 h~17.1 h

Figures are approximate single-appliance estimates. Real backup time varies with inverter efficiency, battery age and ambient temperature. Refrigerators draw a short surge at compressor start — check your inverter's surge rating.

Frequently Asked Questions

How is battery backup time calculated?
Backup time (hours) = battery energy (Wh) ÷ total connected load (W). For example, a 146 W load (2 fans + 2 tube lights) on the INTU 768Wh gives roughly 768 ÷ 146 ≈ 5.2 hours. Real-world results vary slightly with inverter efficiency and battery age.
Which INTU battery models can I compare in this calculator?
All six: INTU 768Wh, INTU Star 1150Wh, INTU+ 1152Wh, INTU Home PSW 1100 (1280Wh, with the inverter built in), INTU X 1920Wh and INTU Pro 2560Wh. All are lithium batteries with a fire-resistant ABS+PC enclosure, smart BMS, 5-year replacement warranty and 10-year design life — only the stored energy differs.
Will INTU batteries work with my existing inverter?
Yes. INTU and INTU+ replace the lead-acid battery of any standard 12V home inverter or UPS. No rewiring is needed — disconnect the old battery and connect the INTU in its place.
Which INTU battery size do I need for my home?
Multiply your total load (W) by the backup hours you want — that gives the energy you need in Wh. Then pick the INTU model whose capacity covers it: 768, 1150, 1152, 1280, 1920 or 2560 Wh. These 12V plug-and-play batteries connect one per inverter, so if you need more energy you step up to a larger model rather than stacking multiple batteries. This calculator recommends the right size automatically.
Can INTU run a refrigerator during a power cut?
A typical household refrigerator averages around 150 W while running, which is within the battery's range, but its compressor draws a brief surge at start-up. Make sure your inverter's surge rating covers the fridge, and use the refrigerator option above to estimate energy use.
View the Full INTU Range