I think I get it -- lets' say your PS/charger needs 1000W, 1000/120 = 8.3 amps.

So PSU supplies a lot of amps to the charger, but only draws 8.3 amps.

Kind of a random thought, but I noticed most of the computer server power supplies on eBay or what not have exposed positive and negative terminals on the back where someone basically soldered on a banana plug connector.

Isn't that kind of a safety hazard? I mean, if you accidentally shorted it with a hex driver or stuck your fingers against it...

They are pulling 30-40 amps on a 12V power supply which translate to 3-4 amps through a 120V socket. max 5 amps taking in the efficiency of the power supply into account.

Yes, these supplies were designed to be installed in an enclosure. The voltage isn't high enough to be a personal harm issue, but shorting with a tool is not good. Liquid electrical tape is one possible solution, brushes on to cover up exposed parts.

Thanks Dave, good tip on the liquid tape. I guess that's one advantage of the MaxAmps type power supplies, they have a nice cover for the terminals.