I am about to upgrade our server room's power plan and would kindly ask you for your help with a proper, optimal design / advice on "good practice" approach. Please note that our business is small, but would nevertheless want to have a solid solution.
What I have so far:
- 2 x APC SMX3000rmhv2u rack UPS w/ management cards
- 2 x simple PDUs built into the rack cabinet
- 1 x 3500W inverter generator for emergency
Any of the UPS's would be enough for equipment in the server room, but would like to use of them for redundancy and if possible, extended runtime.
Which setup would make most sense?
Utility,Generator ==> ats ==> UPS1, UPS2 ==--> PDU ==> load
This setup joins the output of both UPS units with a Y cable. It looks simple and for that I like it, but I wonder if it's ok to run UPS outputs in parallel just with a Y cable. Reading through the documentation of Eaton and APC they seem to call this set-up a parallel-capacity, but I am not sure what component shall be joining those two UPS outputs. Would this approach work? Would it add capacity (double the runtime)? Would it be redundant?
Utility,Generator ==> ats ==> UPS1, UPS2 ==> ats --> PDU ==> load
Or this one? This one adds redundancy, might be an overkill with ATS's, but it seems like a safe bet.
Another option I see is to have both UPS units directly connected to Utility, then their outputs go to ats, from ats to pdu and then to load. In case of power failure I'd need to manually unplug one of the UPS units from utility and plug it into generator.
Unfortunately, I can't post pics :/