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Disclaimer: What follows is just a hypothesis!
I think some (or all) kinds of autosensing power supply stays in 220V mode until detecting a 110V source because putting 220 into 110 circuitry is BAD and putting 110 into 220 circuitry isn't good but doesn't hurt. In this scenario, the inverter might detect the 220V as an overvoltage and shut down... OR the inverter is built with a delay to allow short term draws beyond capacity. The modified sine wave doesn't flip the PS into 110 mode, so its drawing 220. After the delay, the inverter shuts down b/c of overvoltage detection.
With a 110V inverter and a 110/220V power supply there is no 220V. The inverter puts out 160V peak, 110V RMS. The power supply rectifies this into 160V DC. I just looked at the power supply for my Wallstreet and it is, as I thought, rated 100-240 V. This type of power supply doesn't switch between 110 and 220. Rather it operates continuously from 100 - 240. It simply regulates from any voltage in that range.
I don't know why people are having problems with using inverters with computer power supplies. These inverters are primarily designed to be used with such power supplies. The only thing I can think of is that the power supply in question may shut down when it sees the unusual waveform from the inverter.
--
Clark Martin
Redwood City, CA, USA
Macintosh / Internet Consulting
"I'm a designated driver on the Information Super Highway"
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