Easy to use “Inverter / UPS Power Consumption Calculator” will guide you to make better-informed choices.

How to use the power calculator?

It is a simple process, add your appliances from the list and then select the watt from the list provided, submit the data. The power calculator will tell you the power that you need to run the appliances. You should always discuss these requirements with the authorized dealer so that you make a better-informed decision and have a great experience with your inverter or UPS.

How to Calculate Inverter & Battery Backup Time?

Here is a quick guide on calculating inverter and battery backup time.

There are the different capacity of inverters like 200VA, 250VA, 350VA, 400VA, 450VA, 500VA, 625VA, 1200VA, etc. The load of the inverter should be chosen based on how many watts of appliances you power at a time.

How to convert from VA to Watts?

Volts x Ampere = VA (VoltAmpere)
Volts x Ampere x Power Factor = kW (Watts)

where,
Power Factor = 0.8 (which is the max. power factor of the home standard)
If you want to run 200W of appliances then,
200 / 0.8 = 250VA
So, you should prefer the inverter of 250VA or more. 300VA inverter will be the best choice.

Similarly, the battery is an integral part of the inverter. The performance of the inverter depends on the connected battery and vice-versa.

The battery backup time in hours can be calculated using the following formula:

Backup Time = Battery AH x 12V x N x Efficiency of Battery / Load in Watts

where,
Battery AH = Ampere Hour Capacity of Battery
N = Number of 12 V Batteries needed
The efficiency of Battery = Generally it is 0.8, which is the max. the power factor of home standard

Note: 

The inverter capacity is not used in backup time calculation.

Suppose, I have a 60A battery. My load is 150W. I have a single 12V battery. Generally, in-home standard, only a single 12V battery is used.
Backup Time = ( 60 x 12 x 1 x 0.8 / 150 ) hours
= 3.84 hours