Hi Colo Native,
Some MSW are rated to run motors. My Cobra 2500 watt MSW ($200) ran my microwave (which drew 1591 watts) for five years, with no apparent damage. Granted I did not cook a casserole for 30 minutes. It was mostly for run times under 4 minutes. I changed to PSW because I wanted to be able to run the roof air, and also the induction cook top.
Here is how to test the inverter:
This protocol was suggested by mexicowanderer whom I have the greatest respect for:
TEST: Shore power versus alternative power. Put glass of water in microwave and start, if voltage drops to 109 vac or less at same outlet as microwave is plugged into, end of test. Energy source is inadequate.
Stage 2 Same glass of water, start at room temperature with oven thermometer. Set timer for one minute high. Remove glass measure temperature on shore power
Stage 3 Do the same with alternative power source and compare temperature difference to test above.
If there is a large temperature difference, then your microwave is going to unlove you trying to suffer through inadequate voltage or waveform.
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My personal results:
122.6 voltage, no load; shore power
112.4 voltage, 1591 watt Dometic microwave; shore power
112.1 voltage, no load; Cobra 2550
111.1 voltage, 1591 watt Dometic microwave; Cobra 2550
111 seconds of shore power raised one cup of water to 72 C.
111 seconds of Cobra 2550 raised one cup of water to 71 C.
The batteries were fully charged before this test was performed. No other devices were being powered.
Colo Native wrote:
Want PSW and need to run MW which is 900W, plus a toaster that's why I am thinking at least 2000W
