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It is simply an incompatibility between the 2 devices.
I had a similar happen with a brand new TrippLite inverter I used in my car when trying to use a Toshiba laptop. I called TrippLite and was told it was a known issue with that laptop model so they sent me a different model inverter for use with the Toshiba laptop at no charge. The original inverter worked for other things without issue, just not that specific laptop. Sears (or whoever actually makes the unit for them) might be able to tell you more if you contact their support.
Quote:
Originally Posted by fyfchu /forum/post/19974755
The Sears will only put out 400 W max, so it is not going to support a microwave. The confusing thing is the 3576 will run on a cheap 100 W inverter that I plug into the 12 V output of the Sears. Both waveforms are nearly identical on an oscilloscope. These are modified sine waves and pretty ugly looking, but the low power $15 unit works and the high power $120 unit doesn't. I am stumped as to what the difference between the two would be other than the fact that the Sears has a circuit which causes it to cut out when the 3576 is plugged in.
It is simply an incompatibility between the 2 devices.
I had a similar happen with a brand new TrippLite inverter I used in my car when trying to use a Toshiba laptop. I called TrippLite and was told it was a known issue with that laptop model so they sent me a different model inverter for use with the Toshiba laptop at no charge. The original inverter worked for other things without issue, just not that specific laptop. Sears (or whoever actually makes the unit for them) might be able to tell you more if you contact their support.