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Old 10-03-2019, 05:22 AM   #1
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Microwave draws 15A?

I was at a campground last week with some voltage issues so I was monitoring my use fairly carefully. My AS has the provided Microwave/Convection and I assumed it was about 800w, but when I used the Microwave it used 15A on top of the small load I had from the refrig. I couldn't believe it but repeated that numerous times. I have never checked this out but I have never seen a microwave rated at 1800 watts. Maybe on convection oven mode, but just a microwave?

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Old 10-03-2019, 05:39 AM   #2
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I have an older Microwave that does draw about 15 amps. It occasionally trips the 15 breaker. It draws more than the AC when I am running on generator. The draw does not seem to be steady. It sorta waves up and down. I have not done good metering. But in looking at the surge protector amp readout that is what I get. Which is sorta interesting in that the max output for the generator is supposed to be 13.5 but it sits there reading 15 on the surge protector running just fine.
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Old 10-03-2019, 06:38 AM   #3
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I can run my AC on my Honda 2000 generator (on propane) but not my convection microwave. If you have the manual, check the specifications for current draw.

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Old 10-03-2019, 07:38 AM   #4
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OK, I did that. Specs are 12.5A microwave, 13A convection/broil 900w microwave output power. With those specs, should run easily on a 15 amp circuit, nothing else on, but my 15A measurement was accurate. Nothing I can do about it or need to do about it, but I never considered that the microwave was quite that much of a load. I never try to use A/C or electric hot water with the microwave and I make sure DW is not using a hair dryer. Be aware!
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Old 10-03-2019, 07:55 AM   #5
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Was your converter charging your batteries? I donít know how many watts that uses....also have no idea if that question is even relevant so go easy on me
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Old 10-03-2019, 09:45 AM   #6
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I don't really have a converter anymore and the Lithiums were fully charged on solar float. The amps before turning on the microwave were 2, all attributed to the refrigerator. I tested numerous times and the total amps went up to 17. I am confident the microwave is drawing 15.
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Old 10-03-2019, 11:15 AM   #7
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Were the specs given in amps, or did you go back to amps from watts and 120 volts? The power factor is likely not 1, so the amps will be more than you would calculate. Just guessing.....

Al
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Old 10-03-2019, 11:44 AM   #8
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The specs were given in amps, but i would expect a power factor of 1. There is really nothing inductive in a microwave oven except a small motor.
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Old 10-03-2019, 12:27 PM   #9
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I'd like to note that I did some browsing on Amazon of similar microwave convection ovens and they all have very similar ratings. My ammeter is giving me expected readings for the A/C and refrigerator, based on what many people have reported for their units, so I have to believe the reading of 15 amps for the microwave. On the inverter, that is still not many amp-hours to heat something with the microwave, but for people who do not have a hybrid mode when on the generator, a small generator may not carry the load.

Larry
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