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Home Inverters : How to Select the Right Inverter for your House
Selecting the right inverter for your home has become a tough task these days. There are so many terms we need to understand - 800VA/ 1000VA, Tubular Batteries/ Flat Batteries, Half Load/ Full Load and the list goes on. And on top of all these, availability of multiple power back up solutions and misleading information provided by sellers have further added to buyers woes. So we at Tharanthi Technologies are providing you with all the basic knowledge required based on our research and experience so that you dont have to go through misleading information from a seller while buying an inverter.
So What do You Need - UPS or Inverter?
This is one of the basic confusion people face, so let me start with answering this first. UPS and Inverter are words used interchangeably though there are not exactly same. UPS (Uninterrupted Power Supply) is just a system which allows INSTANT switchover to the power back-up source in case of a power failure. The power back-up source can be a battery or something else. Whereas an Inverter is a system which converts direct current to alternate current hence enables using a battery for backing up equipments running on AC power supply. Inverter uses a battery to provide power back-up. Computer UPS comes with in-built battery which works as back-up power source and can provide back-up for 15min. to 30 min. So if that much of back-up is sufficient for you, you should be fine with buying just a UPS for your need. But Inverter comes with more powerful battery and can provide support for electrical equipments, computers, home appliances etc. and also gives more hours of back-up. Most of the inverters come with in-built UPS which ensures that power failure doesn t cause fluctuation and your system switches instantly to Inverter s Power Back up battery.
What Capacity of Inverter is Good for Your Home?
Once you are sure that you are looking for an Inverter, it s important to calculate the capacity of Inverter that will suit your requirement. Following table will give you brief idea about the power consumed by various equipments.
Now you are in a position to understand as what capacity inverter do you need and I ll let you do that in 3 simple steps -
STEP 1 >> Calculating your power need
Now I ll explain you how to use above table to calculate the right capacity Inverter for your need.
Let s say you need Inverter to run 2 Tube lights, 3 Fans, 1TV .
As per the table above, you ll need a total power of 540W(=2X40 + 3X90 + 1X150 ) to support all of your equipments at the same time.
# Your Total Power Need = 540W
STEP 2 >> Calculating required inverters capacity
Now that you know how much power is required, it s easy to get the VA rating of inverter. In ideal condition, the VA rating would have been same as the power need i.e. 550VA. But in practical conditions, the power factor of Inverter is less than 1 hence power supplied by 550VA Inverter wont be 550W but lesser than that. Assuming power factor of Inverter to be 0.7, following are the details of calculation -
Power Delivered by inverter = Required VA of inverter X Power Factor
540W = Required VA of Inverter X 0.7
# Required VA of Inverter = 540/0.7 = 772 VA
Now Tharanthi has inverters with 800VA capacity, so such inverters will fit into your requirement.
STEP 3 >> Calculating battery capacity
Till now, you would have a clear understanding of the Inverter capacity required for your need. But the next question is that how much back up will the inverter provide and for how many hours you can run all of your equipments. And thats where battery capacity comes into picture. It s the battery which determines the back-up hours. The higher capacity battery you have, the more back-up hours you ll get. So lets get into the calculation fast.
Required power(in Wattage) X Required back-up hours(in Hours) = Inverter Voltage(in Voltage) X Battery Capacity (in Ampere Hours)
Let s look for an Inverter which can give back-up of up to 3 hours, so for our case -
540W X 3Hours = 12V X Battery Capacity
Battery Capacity = (540 X 3)/12 = 135 Ampere Hours
So we need a battery of 135AH capacity but if you check the market you ll find batteries of 130AH capacity. So that should be more or less sufficient for your need.
Finally, we have come to the conclusion that if we go for 800VA Inverter with 130AH battery, I can run 2 Tube lights, 3 Fans, 1 TV for up to 3 hours. And by the end of this article you don t need to rely on sellers for understanding your need as you can do the calculations yourself in just 3 simple steps. Hope this article helps you in some way in making the right decisions.