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December 15th, 2019 03:00
Power Supply PFC (for UPS)
I have a old Power Edge T420 (bought in 2013).
On the Dell website, in the configuration table the power Supply is so descripted:
| 6N3GM | ASSY,LBL,REG,FCC1,1100W,AC,V2 | 1 |
| FT55X | FILLER,PWRSPLY,12G | 1 |
| NTCWP | ASSY,PWR SPLY,1100W,RDNT,LN,V2 | 1 |
| T220P | INFO,NRDNT,PSU | 0 |
Now I need to buy an UPS for this and in Internet I see that the UPS must be chosen according to the PFC, if it is Active and Passive.
I don't know where to look and in the documentation there is no information about it.
I also need advice.
This server has only one Xeon E5-2450 CPU, 16GB RAM, 6 HD 2.5 ", a RAID card, an additional card for 4 NICs. No further expansions are planned.
To the UPS I have to connect only a PC with monitor, a 24 ports switch, a small Synology NAS, a Raspberry and a router.
I don't need sophisticated tools. It would be enough to connect the UPS to the PC or Raspberry via USB and have an open source utility to send a shutdown command to the Linux/Windows virtual machines in the server (ESXi 6.5 is installed) and obviusly to PC, Server, NAS and raspberry.
I am oriented to an APC UPS of low cost, possibly below 800 € / 900 $.
What do you recommend?
Can a 1000VA UPS be sufficient?
Thanks in advance for any help and advices.
Dell-DylanJ
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December 16th, 2019 16:00
The answer to your question is likely going to end up being, "it depends."
You have an 1100w PSU, which means that with 1 device your load could exceed the VA rating of the UPS. I don't know what sort of load you'll be running from day to day, but I'd be inclined to look at a size up.
Your power supply, 1100 watts would reflect the real power rating being delivered, but VA, or Volt-Amps is used to measure for a UPS and measures your apparent power. The power factor correction is going to be a decimal that you want to be as close to 1 as possible. If I had a power factor of .8 and a VA rating of 1000, that would put my watt rating at 800.
In most cases, you would probably be fine, because I doubt you'll be drawing the full 1100w, but you could and it would create a problem for you when it did.
I'm not an electrical engineer and I certainly don't consider myself to be a UPS guru, so take this information with a grain of salt. I would turn this around and first determine how much power you're regularly drawing and then select a solution that fits.