Will a 1500w Inverter Run a Microwave
What to know

Will a 1500w Inverter Run a Microwave?

A pure sine inverter offers a more consistent output compared to a modified sine inverter. If you want to use an inverter for your microwave then you should absolutely get one that’s at least 1,500 watts or 1.5 kilowatts. They can run a microwave for sure.

You got a hold of more powerful microwaves to run on a vehicle’s battery serve as the whole point of using an inverter. Instead of connecting via the cigarette lighter port, you can get more mileage out of your car or vehicle battery via a pure sine inverter.

Will a 1500w Inverter Run a Microwave?

Yes. Absolutely yes. However, getting a 1,500-watt or 1.5-kilowatt inverter is just part of the story. If you have a 1.5-kilowatt microwave, it will use up all the inverter output of a 1.5-kilowatt inverter. Better for you to use a 1-kilowatt microwave to spare at least 0.5 kilowatts for other appliances.

GoWISE Power 1500W Pure Sine Wave Power Inverter 12V DC to 120 V AC
GoWISE Power 1500W Pure Sine Wave Power Inverter 12V DC to 120 V AC

You should also search for a higher-rated inverter model in case you want an ensured smooth performance from it. Pure sine inverters maximize power. Appliances other than a microwave or A/C can run fine on modified (inconsistent) battery energy surges.

You can also learn the cooking power of your microwave by estimating it using the “time to boil” test. After figuring out the cooking power of your microwave, you can figure out the power consumption by watts of the device as well.

Finding 600-700 watts microwave, reading this post: The Best Small Microwaves (600 or 700-watt)

What is an Inverter?

An inverter or power inverter changes direct current (DC) to alternating current (AC). This device comes in the form of an electronic device or power circuitry. It mainly converts or “inverts” the DC voltage of your car battery to AC voltage that’s usable for devices like microwaves.

Usually, the AC output remains equal while the DC input voltage ends up lower. The AC frequency offered or inverted from the DC current by a pure sine wave inverter ends up more consistent. The end results vary from inverter to inverter.

a 1500w Inverter
a 1500w Inverter

What Size Inverter Do You Need to Run a Microwave?

Inverters prove most useful when setting up an off-grid system for camping or recreational travel. You absolutely don’t want to end up with an egg on your face by buying a less-than-ideal converter that lacks the power to run your trusty microwave.

You also don’t want to downgrade into using a mini microwave you can hook up to your cigarette lighter port that defeats the purpose of shopping for an inverter in the first place. On average, get a 1-kilowatt microwave

This is a “light-duty” microwave just below “medium-duty” restaurant microwaves with 1+ kilowatts of power. On average, a 1-kilowatt microwave requires at least 1.5-kilowatts of inverter output power to run properly.

What Size of Inverter do You Need to Run Your Microwave?

Just get a pure sine wave inverter with 1.5 kilowatts of output and a 1-kilowatt microwave and you’re good to go. Otherwise, figure out what size inverter you need to make your specific microwave work, like if it’s a medium-duty microwave or something.

First off, figure out the continuous wattage rating of your microwave. You can see it listed on the inside of your microwave door. You can find it in the user manual or the serial number tag on the back of the device as well.

When push comes to shove, just visit the manufacturer’s website and sift through the relevant specs of the microwave. It should be listed there too.

Further reading: Your Guide for the Best Truck Inverter for Microwave

What are the Estimated Watts of Microwaves and Other Appliances?

Here are the estimated watts of the following appliances.

ApplianceEstimated Watts
Air Conditioner2.2 to 5 kilowatts (starting)

1 to 1.5 kilowatts (running)

Toaster0.8 to 1.5 kilowatts
Microwave1.1 to 2 kilowatts
Space Heater1 to 1.5 kilowatts
10-Cup Coffee Pot1.2 kilowatts
Waffle Iron1.2 kilowatts
Hot Plate1.2 kilowatts
Frying Pan1.2 kilowatts
Color TV (25 inches)0.3 kilowatts
Refrigerator or Freezer0.6 kilowatts
Laptop Computer0.05 to 0.075 kilowatts

How Do You Do a “Time to Boil” Test on a Microwave?

If you can’t find the wattage of your microwave, you can figure it out by using the “Time to Boil” test as recommended by the U.S. Department of Agriculture (USDA). To do this, take note of the following.

  • Get a 240ml cup of water inside a 2-cup glass microwave-safe measuring cup.
  • Add ice cubes and stir them around the water till it ends up cold.
  • Remove the cubes and the excess of water. The cold water should be 240ml.
  • Put the container inside the microwave and set the microwave setting to high.
  • Microwave the cup of water for at least 4 minutes.
  • If the water boils in less than 2 minutes it’s a 1-kilowatt microwave. If it instead takes 3 minutes, it’s an under-1,000-watt microwave (usually 650-700 watts).

Now you know the continuous wattage rating of your microwave with how fast it turns cold water into boiling water. This is the cooking power of the device.

What’s the Rule of Thumb for Inverters and Microwaves?

Get an inverter with at least 1.5 kilowatts of power and above. Something so powerful it could work with an Air Conditioner and its starting watts of up to 5 kilowatts. If the 5-kilowatt inverter proves too expensive, get something midway, like 2-4 kilowatts for your microwave use.

The extra kilowatts allow you to use various other appliances simultaneously, such as your toaster, refrigerator, coffeemaker, and so forth. You can even plug in a laptop computer since that only uses 50 to 75 watts.

Check your microwave specs in case you need extra wattage for a starting power surge like with the A/C. 1 kilowatt might not be enough if your microwave requires a starting power of 1.5 to 2 kilowatts (depends on the make and model).

Never Forget

When finding the right inverter for your microwave, find out the actual input power consumption (both peak and continuous rating) of your microwave from the manufacturer website, user manual, or the inside label.

Moreover, choose a sine wave inverter that fulfills both the peak power rating and continuous watt rating of your microwave. A modified wave inverter is too variable with its output to handle things like a microwave and an extra air-conditioner unit.


  1. What Size Inverter Do I Need to Run a Microwave? Our EASY Guide“, Your Energy Blog, Retrieved August 19, 2021

Through the years, the microwave oven has become a standard appliance for all homes. It is safe to say that there is no home without a microwave oven. If you are looking for a microwave oven that best fits your needs, You find the right website.

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