How to choose the best Inverter? – Buying Factors

Do you wonder about how to choose your best kind of Inverter? You are at the exact place, where your clarifications get to be cleared off.

Yeah, it is too obvious that, if you want to find the Best inverter for your home/office electrical appliances, you need to make some calculations accordingly. Here, we will you through the calculations for your reference.

Table of Contents

Choose the load requirement for Inverter power backup

Selecting of load varies from one to another. So, we have given the commonly used electrical appliances to which you to get the backup power supply.

Choose the load requirement for Inverter power backup

Following is the table, with the list of electrical appliances with their power consumption capacity approximated. These are the devices get disturbed when there is a sudden break out in the main power supply.

Fans / Cooler / Air Conditioners Approx. Power Consumption (Wattage, W) Lights & Motor Pumps Approx. Power Consumption (Wattage, W)
Ceiling Fan 70 – 80 W Tubelight 20 – 50 W
Table Fan 45 – 55 W CFL 15 – 30 W
Air Cooler 200 – 250 W LED Bulb 5 – 9 W
AC (1 – 2 Ton) 1250 – 2500 W Incandescent light 40 – 120 W
Inverter AC (1 – 2 Ton) 1000 – 2100 W Motor Pumps (0.5 HP to 1 HP) 500 – 900 W
TV & Music Systems Approx. Power Consumption (Wattage, W) PC & other office appliances Approx. Power Consumption (Wattage, W)
LED/LCD TV 70 – 200 W Desktop Computer 150 – 200 W
Plasma TV 220 – 270 W Laptop 100 W
CRT TV 110 W Laser Printer 200 W
Set Top Box 50 W Office Printer / Scanner 2000 W
Music Player 320 W Xerox Machine 2000 W
Gaming Console Blu Ray Player 210 W Surveillance System 100 W
Kitchen Appliances Approx. Power Consumption (Wattage, W) Home Appliances Approx. Power Consumption (Wattage, W)
Mixer Grinder with juicer 1000 W Washing Machine 1200 W
Refrigerator (200 L – 500 L) 200 – 500 W Vacuum Cleaner 1500 W
Microwave Oven 1500 W Water Heater / Geyser 2300 W
Toaster 900 W Room Heater 2250 W
For instance; Let us consider the following appliances with the respective quantities to get the power back up from the Inverter.
Appliances Quantity (No.) Power Consumption (1 No.)
Ceiling Fan 3 Nos. 70 W
Tube Light 3 Nos. 20 W
LED Bulb 5 Nos. 5 W
LED TV 1 No. 70 W
Fridge (200L) 1 No. 200 W

 Determine the total power requirement of your load for inverter

Case 1;

Total Power Consumption   = Summation of (no. of loads*power consumption per load)

= (3*70) + (3*20) + (5*5) + (1*70) + (1*200)

= 210 + 60 + 25 + 70 + 200

Total Power Consumption (W) = 565 W

Case 2;

12v vs 24v battery backup time

 Determine the VA Inverter rating for your load

Only when you get to know the power rating in terms of the inverter, you can able to select the inverter with respect to the capacity.

Otherwise, there will be an incredible power loss or power lagging, if the inverter capacity doesn’t meet the required load power.

VA Rating of Inverter = Total Power consumed by your loads/Power Factor

(Power Factor varies from 0.65 to 0.8)   (We shall take it as 0.7)

= 565/0.7 (VA)

VA rating of inverter   = 807 VA

Approx. VA rating       ≈ 900 VA

To calculate the wattage (W), W    = VA * power factor (keeping 0.8 as power factor)

= 900*0.8

= 720 W

Note: Our load capacity is best suitable for the Luminous zelio+ 1100 inverter

 Which is better – Sine wave or a Square wave?

Which is better Sine wave or a Square wave

The output waveform that is created from the inverter is more considerable, which correlates with the appliances.

– Usually, the sensitive loads of home appliances generate a waveform which is a sine wave format.

The sine wave format make the loads work efficiently without any disturbance.

The sine wave format of inverter will be the best one that is suitable for your applications.

When, it comes to the point of heavy loads like motors, then, the square wave inverter will be the most suitable for your appliances.

Determine the capacity and No. of the batteries for the chosen inverter

It is actually determined using the period of time you want to have the power backup for your loads. Let us discuss with some calculations in two cases. For better understanding,

let’s have two different calculations for different backup times (for 2 hrs. & for 4 hrs.).

If you require backup of a battery For 2 hrs. backup For 4 hrs. backup
Battery Capacity (Ah) (Power VA rating of Inverter * Backup hrs.) / Battery Voltage (V)
i.e. for Lead Acid Battery, Voltage (V) = 12 V
(807*2)/12 (807*4)/12
Battery Capacity Ah) 134 Ah 269 Ah
Approx. Battery Capacity Ah) 150 Ah 280 Ah
Approximation is 5 – 10 % more than the capacity
No. of Battery 150 Ah / 12 V = 1 No. 150 Ah / 12 V = 2 Nos.

“If you wish to know the backup time for your inverter battery set, then you can proceed with the below format”

inverter battery backup time

 Which Type of Battery is suitable?

There are three types of batteries available and are applicable according to their own specification and applications.

The types of batteries are: Flat plate, tubular and the sealed maintenance free battery (valve-regulated lead-acid) battery. For the precise note, check out the comparison of battery types here.

Features of Flat Plate Battery

Features of Flat Plate Battery
This type of battery is being designed with the simple design and is pocket-friendly. By the name, it is made of plates and they are thinner form in their design.

The life time of battery is low and it needs frequent water refilling. It is not suitable for heavy loads.

Features of Tubular Battery

Features of Tubular Battery
This type of battery is made of complex circuit design.

It reduces the water loss and hence, doesn’t require frequent water toppings.

The life time of the battery is expected for more number of years. Quick charging is available.

It is suitable for sensitive loads to heavy loads. The cost is high in terms of tubular battery.

Features of SMF Battery

Features of SMF Battery
SMF is nothing but the, Sealed Maintenance Battery (SMF), designed to offer trustworthy, dependable and low maintenance.

It is the best suitable for the 2-wheeler (bikes) / cars / etc., It is sealed and packed from the factory itself.

Hence, it is spill proof and it is the best suitable for bikes.

It comes with the rechargeable options, once in 3 months. But it is not suitable for home appliances.

Hence, from the above calculations and features, the best suitable inverter for the load taken is that the inverter with 900 VA with 150 Ah/12 V DC capacity battery with it.