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Posts: 14,609
Join Date: Nov 2005
Location: Des Moines, IA
01.27.2010, 10:29 PM

First of all, you want to figure in a typical charger efficiency of ~80%, and then I like to add another 15% as a safety margin. So, that 250w charger will require around 370w. Assuming the PS can deliver a stable 12v, it needs to be rated for at least 31A.

When shopping for supplies, make sure that they don't have multiple 12v rails. What you want is a single high current 12v rail.
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