Server Fault Stack Exchange
Server Fault Stack Exchange

Questions tagged [ups]

uninterruptible power supply

An uninterruptible power supply, also uninterruptible power source, UPS or battery/flywheel backup, is an electrical apparatus that provides emergency power to a load when the input power source, typically mains power, fails. A UPS differs from an auxiliary or emergency power system or standby generator in that it will provide instantaneous or near-instantaneous protection from input power interruptions by means of one or more attached batteries and associated electronic circuitry for low power users, and or by means of diesel generators and flywheels for high power users. The on-battery runtime of most uninterruptible power sources is relatively short—5–15 minutes being typical for smaller units—but sufficient to allow time to bring an auxiliary power source on line, or to properly shut down the protected equipment.

enter image description here

Source: wikipedia

272 questions
19
votes
4 answers

Replace a UPS battery or buy a new UPS?

Is it worth buying a replacement battery for a UPS or better to buy a completely new UPS? I have heard a UPS is never the same after the original battery dies and is replaced. Is it OK to use a third party after-market replacement battery or should…
yothenberg
  • 301
19
votes
10 answers

Testing a UPS by unplugging it from the wall

At an Not For Profit/Charity I volunteer for occasionally we were very fortunate to be provided (donated) with a brand new 3Kva APC UPS. This is total overkill for our modest server rack (four mid-range servers and a switch!) but hey, I'll take what…
Mark Henderson
  • 69,083
12
votes
1 answer

datacenter UPS electronics/chassis expected lifetime

We have a small datacenter with seven APC 5000VA rackmount UPS. These have had regular battery replacement, but have just passed 10 years of service. We also have a boxed spare unit of the same model in storage. The devices have seen very few…
rmalayter
  • 3,782
12
votes
4 answers

How to configure UPS to restart servers in the right sequence?

Here we have some servers and almost each of them has a dedicated UPS. There are dependencies between them so they must be switched on in the correct sequence. Ultimately we are experiencing serious problems with the power supply, so the servers are…
Filippo
  • 373
  • 5
  • 18
7
votes
3 answers

UPS power requirements for server

Greetings! So, I just placed an order for a new server. The company recommended that I get a 3000W UPS. (!) As best as I could I calculated the following wattage consumption based on benchmarked data or datasheets provided by the manufacturers of…
captainentropy
  • 111
  • 1
  • 2
  • 6
6
votes
1 answer

Calculate UPS Power

Does anyone know how to calculate UPS Power assuming I have server with 650 of watt.
Funky81
  • 295
  • 2
  • 13
6
votes
7 answers

Is Tripp Lite a trusted brand for a UPS?

I am looking to buy a rack mounted UPS that can take in 208V power and serve up 120V power. A basic APC unit that can do this is $4k. I have found a Tripp Lite model that will work for $2.5k. Is the extra $1.5k for the APC just for the brand? Or…
David
  • 79
  • 1
  • 1
  • 4
6
votes
5 answers

Do aging UPSes need to be replaced?

I've got a 2200VA UPS with AVR and power conditioning that's over 10 years old. Does a UPS lose its ability to protect equipment over time? I'm not asking about batteries, but the UPS hardware itself.
Boden
  • 5,008
4
votes
5 answers

UPS suitable for small-business network and server infrastructure

I've tried a number of UPS units for numerous small business installations, as well as my own home systems and have yet to find a reliable brand. Some units last for years, other units of the same make/model end up burning out in 2 months. Not…
patjbs
  • 258
4
votes
2 answers

Checking voltage expectation of HP G3 UPS

We have several HP G3 UPS's (most of them are HP R1500 G3). Some of our UPS's were constantly going into Buck mode. Turns out their dip switches on the back were never changed from default, which was to expect an input voltage of 220V, and our…
Mark Henderson
  • 69,083
4
votes
7 answers

UPS disposal

What do I need to do to get rid of my old UPS? The battery no longer works, and the unit is probably completely hosed at this point, as the equipment on it suffers from the occasional complete reboot. So, I won't give it to someone or donate it,…
mmr
  • 379
3
votes
4 answers

Smart UPS 2200 question

I have a smart UPS 2200 that is giving me problems, I suspect that the batteries need to be replaced, but I am not sure. There are no visible problems, ie. no error codes, no error lights etc, but every once in a while, usually if there is a power…
EJB
  • 1,319
3
votes
2 answers

UPS - serial or parallel

I've two UPSs. I'm going to connect two devices to them and the combined wattage of the devices is below the rating for each single UPS. Would it be better* to connect the UPS device in serial with both devices connected, or to connect one device to…
Mr. Flibble
  • 723
3
votes
1 answer

What is the interruption time of an offline UPS system?

I am trying to figure out what the maximal interruption for an offline/standby uninterruptible power supply (UPS) would be. According to wikipedia: "The switchover time can be as long as 25 milliseconds depending on the amount of time it takes the…
Lucas
  • 163
3
votes
3 answers

Why does an UPS switch to battery so frequently when the voltage is ok?

We've just bought an APC Smart-UPS X 150VA and were surprised with how frequently (many times per hour) does it switch to battery just to switch back to line in about a second. The light doesn't blink, nobody is arc-welding around, there are no…
Ivan
  • 3,398
1
2 3