John R Pierce wrote: > On 07/06/11 5:44 AM, Lamar Owen wrote: >> Sure; we have a couple of small units like that for some solar-powered >> things we're doing here; however, the max I've seen for those plug-in type >> small ATX/ITX power supplies has been in the ~200W range (the specific one >> you linked to is only 160W), and my reply was specifically directed at the >> idea that lower than 48 VDC input was limited in power handling...... >> PowerStream has a 500W 12VDC input unit, which is quite a bit more power >> than I've seen in the mini-ITX plugin supply categories. > > 500 watts at 12VDC is 41 amps. that requires some hefty wiring, and if > you have to run it any distances, either the wire is ridiculously heavy > (and expensive) or you suffer from voltage drop under load. > > 500 watts at 120V is only 4 amps, and can easily be run 100s of feet > through simple lamp cord sized wiring. > I would/will only use 12V power for direct connection from UPS battery to ATX connector. It reduces conversion losses and power draw.
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