[jeffbee]

Yes but Google also later moved to a 48VDC power architecture with the batteries at the bottom of the rack.

See http://apec.dev.itswebs.com/Portals/0/APEC%202017%20Files/Pl... page 6.

[tyingq]

That presentation is pretty interesting, including Google inventing their own "Switched Tank" DC-DC converters because the existing ones weren't efficient or reliable enough.

[jeffbee]

There's a whole separate paper on that:

https://storage.googleapis.com/pub-tools-public-publication-...