Standalone DC power recommendations?

We are going to need to deploy about 800A of -48VDC power equipment in a
datacenter that doesn't supply DC power normally. They will give us an three phase AC-power feed that is generator backed.

Can anyone point me in the direction of a decent vendor of DC-power plants that are suitable for this size need and/or a ballpark price one would expect to pay for the equipment?

Thanks in advance,

Deepak

Liebert (Helios, Candeo lines for example) is one place you can start.

Ask them to spec one out for you.