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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.

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Source: wikipedia

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How to calculate draw power from specs for a UPS

We recently installed some new blade servers and we have 'overloaded' our current UPS (APC Smart UPS 3000). We bought an identical UPS to balance out the load, however, we did not have another 30 Amp socket in our server room to support it. I have…
Justin
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How to choose the right rack and UPS?

I have two configurations: 10 Dell PE R720 servers, 2 Dell EqualLogic PS6100S arrays, 4 Dell N3000 Switches, 1 N4000 switch 20 Dell PE R820, 1 Dell EqualLogic PS6100S arrays, 2 Dell N3000 Switches, 1 N4000 switch And I'm wondering how to (wisely)…
mirx
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How to test a battery outside a UPS

I have an APC Back-UPS 550 that is showing a replace battery alarm (alternating red/green flashing LED with constant tone). The battery registers 12.7 volts on a multimeter when disconnected from the unit. This makes me question whether the…
zenzic
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NUT slave powering off when master reboots

I have a homelab with the following setup: NAS (QNAP TS-453D) <─usb─ UPS (CyberPower VP1000ELCD) | ethernet └> Proxmox Server The NAS is the UPS master, configured to poweroff after 5 minutes the AC fails. NAS ups…
Nemesis
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UPS battery sulfuric acid fumes?

I'm confused. Why are UPS units installed in racks (usually in the bottom of the rack) with many thousand of dollars worth of servers; switches and other electronics with sulfuric acid fumes being pulled thru them with the fans? This seems wrong. I…
bjr
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How can i connect two parallel UPS that sharing the same load?

I have a critical load .I want to connect two parallel UPS that sharing the same output, how can i control them?? it's hard and danger to turn on both of them and synchronizing them. i want a controller name or a way to control them. the controller…
Hamza Ahmed
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APC UPS replace battery illuminates

I have an APC SmartUPS 1000 for my servers. It was good for over 2 years, its capacity is always 5/5. One day I saw a red light illuminated. I searched for the reference it is either "Replace" Battery" or "Battery Disconnected". If that was battery…
AkiEru
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What is the ideal Windows Update / backup device for a LAN with a slow metered internet connection

I was just in Kenya for several weeks helping some wildlife conservation orgs with their computers and IT. The biggest issue (aside from not enough funds to update tech as often as they should) is that most locations have very limited internet; It…
Dave C
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How to find the battery type on a server UPS Socomec Mastery BC

I am in a situation where I have to change the UPS batteries of a Server and I cannot even find the type of the batteries that are compatible. Here is what I have tried until now: I have found the UPS model which is a Socomec Master BC Found the…
BugShotGG
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Power consumption PDU

As you can see in the image below, I can't get the consumption. Even if I send the log via FTP there's no info about the consumption. I already checked on APC PDU website and co and i didn't found any info. Model Number: AP7821 Application Module…
e1che
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UPS for tiny load

I am looking for UPS to backup 1 cable modem, and 1 mikrotik router. I have been trying a brand, but but it was shutdown after a few minutes because its load was under 1%. Both devices measured at around 3 - 4 Watts Any advice which UPS should I…
prd
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Large APC on Standard Home Socket

I am thinking about purchasing an APC that has a max power capacity of 2850 watts / 3000 volts. I only plan on plugging about 1000 watts of actual power into the unit however. I'll be running this for a few home servers. Considering a standard US…
ryandlf
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Establishing monitoring on nine Dell UPS that do not have management cards

Goal - Establish monitoring on nine Dell UPS that do not have management cards. • Dell UPS 1000W x 8 • Dell UPS 3750W x 1 Is it possible to daisy chain the USB or Serial (RS-232) ports on Dell UPS? Trying to get monitoring via Dell UPS…
bezoid
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Is a Virtualbox FreeNAS VM reliable (with a UPS)?

I started looking at - Is FreeNAS reliable? I would have taken issue with TV10's comment : "longer than a UPS would handle it" (but I don't yet have a rating high enough to do so). I am running a trial for this with a laptop (with 2GB mem) running…
irdroid3
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How do I prevent a computer from powering off when Windows is shutdown?

I would like to configure my servers to shutdown Windows via a script without actually turning the systems off.
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