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Electripedia - Inverter


Topics covered:


  • Introduction
  • Frequently Asked Questions
  • Inverter Load Chart
  • Inverter Battery Backup
  • Inverter Input/Output Electrical Wiring



An inverter or a home UPS is a power backup solution. Typically purchased for the entire home, the solution provides temporary power supply to its connected loads from a battery in the event of a mains supply failure (power cut) until mains supply returns. The back and forth switching between mains and battery is seamless.


Frequently Asked Questions


Q. Which is more appropriate for my requirement? An inverter/home UPS or a computer UPS?

A. This is a basic query you must be clear about.

If your loads are electronic such as a computer, router, printer etc. and your backup time need is minimum (~ 5 minutes), then you could minimize your investment with our Computer UPS products, which include internal batteries.

If your loads also include electrical items such as fans, lights, A/Cs etc. and/or your backup time requirement is large (~ 2-4 hours), then you need to consider our Inverter or Home UPS products. These need to be connected to 1 or more external Inverter Batteries to get high backup times.

Another important distinction is that if you have multiple computers requiring backup power, then a inverter or Home UPS is not the answer as they are typically designed to include only 1 computer in their load options. You will need a Computer UPS. For higher backup times, you will need UPS options with external batteries.


Q. What is the difference between an inverter and a home UPS?

A. The difference between the two lies in the speed of switching over to battery backup in the event of a mains failure. Both the inverter and home UPS supply mains power to connected loads as long as it is available.

Upon mains failure, the inverter typically takes 500 milliseconds to swtich over to battery backup. This much time gap is not acceptable to sensitive electronic devices such as computers, modems, printers etc. which will restart or reboot because of this momentary drop in power supply.

The home UPS is designed to address precisely this issue; it swtiches over in 3 to 5 milliseconds, which is fast enough for the electronic devices.


Load Chart


Refer to the following chart to determine the required inverter or home UPS capacity (in VA) for each electrical or electronic load that you plan to connect to your inverter or home UPS. Based on the total VA arrived this way, you may select the nearest capacity (in VA) inverter or home UPS.  

Load  VA
40 W Bulb 60
60 W Bulb 90
100 W Bulb 150
11 W CFL 15
18 W CFL 25
22 W CFL 35
40 W Tubelight 60
Ceiling Fan 150
Table Fan 115
Small (14") 75
Large (21") 115
20" LCD 120
27" LCD 210
32" LCD 300
37" LCD 375
42" LCD 450
42" Plasma 715
Audio System  
Music System 900
PC with 17" LCD 270
PC with 21" LCD 300
Laptop 180
132 Col Dot Matrix 150
80 Col Dot Matrix 120
Inkjet (Small) 150
Inkjet (Big) 750
Deskjet 300
Laserjet (Small) 750
Laserjet (Big) 1500
Home Office  
Wireless Router 30
Projector 525
Scanner (Small) 150
Scanner (Big) 750
Fax Machine 750
Photocopier (Small) 3,050
Cooler (Kit) 340
Cooler with Exhaust 24" 525
0.75 TR Window 2,400
1 TR Window 3,135
1.5 TR Window 4,330
2 TR Window 5,375
1 TR Split 3,050
2 TR Split 3,960
3 TR Split 6,050
165 L 975
Frost Free  480 L 2,100
Non Frost Free 360 L 2,100
Side by Side 560 L 2,120
Mixer and Grinder 375
1000 W Water Heater/Geyser 1,500
2000 W Water Heater/Geyser 3,000


Battery Backup Times


Refer to the below tables to determine the amount of backup time your inverter battery will approximately give you. In other words, depending on your backup time requirement, refer to the below tables to select the battery of nearest capacity.


850 VA Home UPS

No. of Batteries Battery Capacity (Ah) Battery Backup Time (hr)
1 100 ~ 2
1 135 ~ 2.5
1 150 ~ 3
1 180 ~ 3.5


1500 VA Home UPS

No. of Batteries Battery Capacity (Ah) Battery Backup Time (hr)
2 100 ~ 2
2 135 ~ 3
2 150 ~ 3.5
2 180 ~ 4


Inverter Input/Output Electrical Wiring

The following electrical wiring materials are required for input power supply to the inverter or home UPS and for supplying UPS output power to loads:

For 600-1000 VA Home UPS

On the Inverter Input Side

1 No. 16 A Plug Top

1 No. 16 A Socket

1 No. 16 A Switch

1 No. 3 Module Surface Plate

1 No. 3 Module Surface Box

1 No. 3 Module Wall Plate

2.5 Multistrand Wire Bundle.

On the Inverter Output Side

1 No. 16 A Plug Top (connected to UPS)

1 No. 6 A MCB. 

2.5 Multistrand Wire Bundle.

Our Recommendation:

Buy 2 mutlistrand wire bundles, FRLS type, 1 red color for phase and 1 black for neutral, for complete input/output wiring of a 2 or 3 BHK home.