I use: http://www.mastechpowersupply.com/dc-power-supply/switching-power-supply/volteq-power-supply-hy5020ex-50v-20a-over-voltage-over-current-protection/prod_61.html
The output is changable from positive to negative ground by moving the shorting bar to ground from the - output to the + side. If you need to be able to charge a 48v battery plant you'd want the 60v version instead, but it's more $. The 50v one works fine for benchtesting equipment, at least. -Will On Mon, Feb 03, 2014 at 02:02:11PM -0700, Mark Leonard wrote: > Date: Mon, 3 Feb 2014 14:02:11 -0700 > Subject: -48VDC supply for home lab? > From: Mark Leonard <m...@bernoullinetworks.com> > To: "North American Network Operators' Group" <nanog@nanog.org> > > Greetings NANOG'ers! > > I have a small home lab which I mostly use for learning and testing. I'm > likely to receive some gear that needs negative 48VDC (ie: positive > ground). Mains is a typical 120VAC, 60Hz. > > Can anyone recommend a power supply, reasonably priced, to go from 120VAC > down to -48VDC@10Amps? Something that fits in a two post rack would be > preferred, but not required. > > Thanks, > Mark
