What Size Power Inverter Do I Need?

June 2nd, 2020


Bestek Product News


No matter in the home or in the industry, more and more inverters are put into use. The inverter is an instrument that can convert DC power into AC power, and it has the function of filtering clutter with stable voltage. The inverter is widely used, including air conditioning, electric tools, computers, and other equipment. When camping in the field, we can use car power generation to supply electric cookers, mobile phones, lighting, and other equipment through the inverter. Most of the household car battery is 12V, while the truck battery is mostly 24V. When purchasing inverter, pay attention to the car battery parameters. The battery voltage must be consistent with the nominal DC input voltage of the inverter,  For example, the 24V inverter must correspond to the 24V battery.


How to choose the right inverter?

The amount of wattage you will require depends on the total draw of the devices you’d like to use. Simply put, the package and products of electrical appliances will be marked with rated 

power. The rated power can also be calculated by the following formula:


Suppose we want to size an inverter to carry the following loads:

1. Lighting load, 300W

2. 3 Standing fans of 70W, each

3. 2 LCD TV, 100W

4. 1 Home Theatre Music System, 200W

5. 1 Juice extractor, 150W

6. 1 Blender, 400W


Applying Power in KW = Power in KVA x PF

Power in KVA  = Power in KW/PF = Power in KW/0.8    (Nominal PF = 0.8, which is standard for homes)


Total load in Watts = 300 + (3 x 70) + 200 + 200 + 150 + 400 = 1460W = 1.46KW

Power in KVA = 1.46/0.8 = 1.825

An inverter of standard rating 2KVA is required to carry the loads above.



Working efficiency of the inverter

The inverter itself consumes part of the power when it works, so its output power is smaller than its input power. For example, if an inverter inputs 100 watts of DC and outputs 90 watts of AC, 

its efficiency is 90%. So when you buy an inverter, you need to buy an inverter with slightly larger power than the appliance you need to use.


Modified sine wave or Pure sine wave?

Modified sine wave inverters are all-purpose inverters, which are very affordable. Using a more basic form of technology than pure sine wave inverters, they produce power which is perfectly 

adequate for powering simple electronics. Use modified sine wave inverters to provide power for your less sensitive appliances like phone chargers, heaters, and air conditioners. 

Modified inverters are best suited for resistive loads that don't have a start upsurge. Check out the Buyer's guide by Rvexpertise, you would find the best inverter for RV.

Pure sine wave inverters use more sophisticated technology to protect even the most sensitive electronics. Pure sine wave inverters produce power which equals – or is better than – the 

power in your home. Appliances that may not function properly, or which may be permanently damaged, without pure, smooth power will be safe with pure sine inverters. Use these inverters 

for televisions, laptops, digital microwaves, fridges, and other sensitive electronic equipment. Pure Sine inverters can power just about any AC appliance without risk of damage.

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