How Much Power Does an Inverter Draw With No Load

Inverters are used for converting DC voltage signals into AC voltage signals. For this purpose, one has to connect the inverter with a battery or a couple of batteries. The inverter consumes the battery DC voltage and changes it to AC. That means it consumes a limited amount of DC voltage and the battery loses its power.

But sometimes it seems that when the battery is plugged with the inverter the battery loses power. Some people wonder why this happens. And also wonder how much power does an inverter draw with no load. If you are reading this, that means you are also one of them. Today, we will discuss about it and also we will discuss how to reduce the power consumption of the inverter with no load.

How Much Power Does an Inverter Draw With No Load

Basically, the answer depends on the inverter size. The bigger the inverter, the more power it will draw from the battery.

For a quick example, let us assume you have a 300 watts inverter. The power consumption of this inverter in standby mode is more than 2.4 watts or 0.2Amps. And if the size of your inverter is anywhere near 1000 watts, then the inverter may consume more than 9.6 watts or 0.8Amps.

How to calculate the no-load power consumption of an inverter

There is a simple formula to calculate the power consumption of an inverter. With the help of this formula, a general person can calculate the power consumption with ease.

The formula is to multiply the inverter battery voltage with the no-load current. Now, you may be wondering where you will find the no-load current of your inverter. Nothing to worry about. Basically, all manufacturers provide an instruction manual with their inverters. One can find the no-load current on the specifications page or even can find it in the inverter’s body.

Let’s see an example for more clearance.

Assume that you have a 700W inverter of 12V. And the no-load current rating of this inverter is about 0.6Amps.


The power consumption = Battery voltage * No load current

                                             = 12 * 0.6

                                             = 7.2 Watts

From the above example we can see that the power consumption of a 700W, 12V inverter is 7.2 watts. If the inverter’s voltage increases, then the power consumption will also increase.

Why do inverters consume power with no load

There is no such inverter that does not consume power in standby mode. But the question is why this happens.

The reason why an inverter consumes power with no load is because of the sine wave. If the inverter remains on and no device is connected with the inverter for power, then it will always produce a sine wave. And to produce this wave the inverter has to consume a decent amount of power. The larger the inverter, the more power it requires continuously to create this sine wave. Though the consumption seems low in total it is a great amount of power.

How to reduce the no-load power consumption of an inverter

As the inverter is continuously consuming power for generating the sine wave in standby mode, therefore, one should try to reduce the power consumption for efficiency. Here is some advice for reducing the no-load power consumption of an inverter.

  • The simple thing one can do is to turn off the inverter after use. When the inverter is off, there is no way it will consume power. Some people are very lazy and do not turn off the inverter when they are not using it. This also reduces the durability of the inverter. Each inverter comes with a convenient remote to operate. If you are so lazy then use the remote for this purpose.
  • Modern inverters come with some innovative modes. One of those modes is an eco-friendly mode. Some inverters come with a button for this purpose. If you are not using any appliance, then make sure the eco mode is on. This will reduce the power consumption in standby mode.

However, there is another way that one can follow to reduce the power consumption of an inverter. For this, one needs a computer and software known as VE configure 3. This software can help one to reduce the power consumption by up to 70%. Here are the steps that one needs to follow for this task.

Step 1- Simply install the software and connect the generator with the computer. And open the software.

Step 2- The software interphase is very simple and straightforward. On top, one will find the menu. Click the Inverter from the menu option.

Step 3- Once you click the inverter, there will be new interphase. There you will find enable AES function. Check the box to enable the function.

Step 4- After enabling the button, two different modes will appear. If one uses the modified sine wave mode, then the generator will consume 20 percent less power than normal consumption.

However, we recommend one to choose the 2nd option. The 2nd option will reduce the power consumption by 70 percent. This mode simply changes the frequency to 1 hertz. That means this mode produces one sign wave per second. Therefore, the inverter uses far less energy in standby mode. However, it can affect regular performance. If one connects a device with the inverter, the inverter will go back to its regular operation process but may produce less power than before.

Final Words

The inverter draws power from the connected battery in order to create a sine wave. If the inverter is turned off while not in use, then there will be no sine wave producing by the inverter. Here, we have discussed how much power does an inverter draw with no load. Also, we have shown how one can calculate the amount of power consumption. We have shown some ways how one can reduce power consumption effectively. However, one should not follow the 2nd way because it can reduce the output power of the inverter.

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