48V and DC power is ok for low amperage stuff like telecom. But powering servers takes a lot of watts. So the only practical way to do that would be to power a rack with high voltage AC (120&#x2F;240&#x2F;400) and then have a single AC-DC and supply servers in the rack with DC. The battery systems described in this article would have to be single per rack in this configuration.<p>Until the industry started getting making new DC-DC power supplies with batteries.