Original poster: "Dave Pierson" <davep@xxxxxxxx> [OT?} >>...120 V ISS Power... > Why? Why not? If true (and I'm not calling anyone untrue..., likely covered in some onweb NASA document...???) AC is handy for voltage changes, for long distance: ISS is Rather Small. AC was handy with 1900s technology. Its 2007: solid state inverters, DC solar cells, DC batteries are common, efficient. best dwp