We run off a large UPS (room size). Power feed > UPS > server room power. A generator kicks in within five seconds if street power is interrupted. You want as large a single UPS as you can utilize ...
0U side mounted PDUs to start. APC racks and their PDUs are awesome. We then ordered 2ft cables in black and 1ft in white, that gives us enough slack to cable in both of the HP server power supplies ...