Microwave on PSW vs MSW Inverter- Results

[BFL13]

I have been using a MSW inverter to run the microwave for several years now, and decided to try a PSW inverter. I expected the microwave to run a little better and for the inverter to draw more amps from the battery. But how much?

The microwave is a 2001 Kenmore (LG) output 1100w, input label says 1510w, so expecting about 150 amps draw using the times 10 rule. Battery bank is 450AH of deep cycle AGMs and appropriate wiring. The MSW inverter has worked just fine with that running this microwave.
I did a straight swap with the same wiring.

So the results are:

MSW- 123 amps, PSW- 162 amps (so it must want more than that 1510w)

Cooking power difference at full power doing a cup of cold water for two minutes, then check temp of water.

MSW- 150 degrees F, PSW- 175 degrees F

New inverter is this one:

https://www.amazon.com/PowerMax-2000-Watt-Power-Inverter/dp/B07DQTW1SW/ref=sr_1_26?ie=UTF8&qid=15331...

(In the ad, Inverters-R-US can't spell "complement" for some reason 😞 )

The MSW I have been using is this one (except it was on sale for $200)

http://www.canadiantire.ca/en/pdp/motomaster-eliminator-power-inverter-with-bonus-cables-3000w-19999...

[pianotuna]

Hi BFL13,

Thanks for taking the time to do this test.

Did you note the "under load" voltage output from the two inverters? (i.e. AC voltage).

[2oldman]

BFL13 wrote:
(In the ad, Inverters-R-US can't spell "complement" for some reason 😞 )

Or use "its" correctly.

[GordonThree]

Thanks for the observation. One set of measurements shouldn't be considered an indication of anything. That's just my observation.

Congrats on the gear upgrade, hopefully the install went smooth.

[BFL13]

GordonThree wrote:

Ed_Gee wrote:

GordonThree wrote:
Strange that it would have any impact on the RF output. how many times did you run each test, at least 10 I hope?

Not strange if one assumes the microwave oven would run more efficiently on a proper sine wave rather the the stepped square waves of the cheaper Inverter.

The important part of the microwave runs off DC, stepped ac or otherwise would get sorted by the boost transformer and hv rectifier.

We have had many threads about microwaves on MSW. They run slower, some moan and groan, some won't run at all. It is all about the power you get with the wave forms. Many run ok and cook ok, just take longer.

I am just reporting here how much the difference is in this case. It is important if you do swap and find the existing wiring or battery set-up can't handle the extra load, so you need to expect that.

Before you could make MW popcorn while watching the movie and now you can't! Have to make the popcorn during intermission with PSW 🙂

[GordonThree]

Ed_Gee wrote:

GordonThree wrote:
Strange that it would have any impact on the RF output. how many times did you run each test, at least 10 I hope?

Not strange if one assumes the microwave oven would run more efficiently on a proper sine wave rather the the stepped square waves of the cheaper Inverter.

The important part of the microwave runs off DC, stepped ac or otherwise would get sorted by the boost transformer and hv rectifier.

[Ed_Gee]

GordonThree wrote:
Strange that it would have any impact on the RF output. how many times did you run each test, at least 10 I hope?

Not strange if one assumes the microwave oven would run more efficiently on a proper sine wave rather the the stepped square waves of the cheaper Inverter.

[BFL13]

SidecarFlip wrote:
Your math is fishy.....

I'll bite! What math?

[GordonThree]

Strange that it would have any impact on the RF output. how many times did you run each test, at least 10 I hope?

[SidecarFlip]

Your math is fishy.....