Comments on: MiTAC Intel DSG 3000W Fanless Liquid Cooled PSU

By: Nick

Nick — Wed, 18 Sep 2024 22:48:02 +0000

Wait, am I reading the label right… It has 240V DC for China only? Where in the hell do they provide 240V DC. I’ve been around datacentres for 15 years and haven’t seen that yet. I’ve seen the ‘high voltage’ DC (400V) to top of rack and step down to 48V for servers, but not yet a 240V DC.
Anyone know where that’s commonly seen?

By: Frank

Frank — Wed, 18 Sep 2024 18:50:52 +0000

@Mike does that mean that the PSUs in the racks all run on 120V single phase?

I was under the impression that capacity density and efficiency were greatly improved at 240V single phase vs 120V single phase.

By: Mike George

Mike George — Wed, 18 Sep 2024 17:45:22 +0000

@Frank, most data centers have 208v(Phase to Phase and 120v Phase to neutral – 4 wires) 3-Phase WYE. 220-240v(Phase to Phase – 3 wires) 3-Phase DELTA, loads tend to be for inductive – ie balanced loads across all three phases. When you have an imbalance in phases you need to use a 3-phase 208v to send the imbalance thru the neutral wire. In the Datacenter I co-manage all power to the racks from the PDU is 3-Phase WYE and to the CRAC units it’s 3-Phase Delta 480v. When you also use a WYE configuration you can also get three circuits of 120v(Phase to neutral)

I hope it helps to understand.

By: Enriquo Polazo

Enriquo Polazo — Wed, 18 Sep 2024 13:58:16 +0000

splashy splashy server crashy

By: Frank

Frank — Wed, 18 Sep 2024 05:38:12 +0000

What voltage is supplied to racks in the US?

I’d guess 3-phase up to the rack, and then? 220-240V would make a lot more sense for getting higher efficiency from rack-based PSUs. I doubt there’s much out there on the datacenter world that is still 110-120V only; PSUs tend to be world-wide SKUs nowadays.

By: José Franco Campos

José Franco Campos — Wed, 18 Sep 2024 04:38:44 +0000

@Frank yes, that is C21/C22, but in addition to that, if you click on the 4th picture it says that with a 100~127V input the output is limited to 1kW, to reach 3kW you need 200~240V input.