A UPS (uninterruptible power supply) is a device used to provide instant backup power to critical systems for safe shutdown in the case of a power outage.

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What is the use of UPS Sizing?

UPS sizing as I have read in the internet is a simple mathematical formula multiplying power (volts) and current (amps) to eventually come up with the load rating VA (volts x amps). The answer i got ...
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15k views

If my power supply is 700w, do I need a 700w UPS?

if my power supply is 700w, do I need a 700w UPS? I am running dual 20" dell LCD's, a i7 quad core system with a radion 4870 1gb video card, 2 hard drives.
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32 views

my power supply is 400w, do I need a 400w UPS? [duplicate]

my power supply is 400w, do I need a 400w UPS? my cpu is pentium g620 2.60Ghz,2gb 1333mhz ddr3 ram,160hdd,nvidia gt210 1gb gpu,400w psu samsung 22" LED
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2k views

How can I set my Windows 7 desktop with a UPS to automatically turn on after a power outage is over?

I've got a Windows 7 desktop system with an APC UPS to provide backup power during power outages. I've got the UPS connected to the system with a USB cable so that the built-in Windows power utility ...
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31 views

UPS battery replacement

For the UPS model Niky 900 by Daker, I'd like to replace the original CBS HR1234W F2 battery with something I can buy on amazon.it, e.g. FIAMM models: could you suggest what are the relevant ...
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48 views

Turn off computer automatically when there's no electricity

I'm wondering that I could not find anything useful on Google. I'm using a cheap UPS which actually prevents my computer to be turned off immediately if there are some electricity issues (they are ...
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43 views

My computer restarts automatically when there is power outage and the monitor is turned on, using UPS power

I have a Zebronics Power UPS which backs up the system power at the time of power outage. I have no issues with that. But yesterday night I kept a movie to download and slept turning off just my ...
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48 views

APC Smart-UPS 1000VA - command file won't get executed

I've got this old piece - http://goo.gl/5M37Sc, working reliably so far, but it has one big problem: command file when power is down won't run. Everything seems to be configured correctly, but when ...
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2answers
251 views

UPS switches to battery power when plugging in devices?

Over the past week or so I've had my UPS switch over to battery power briefly when plugging in new devices (possibly limited to just AC -> DC chargers, but haven't tested anything else). I had ...
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14 views

What depth of discharge does 0% in a UPS correspond to?

When a UPS like an APC Smart-UPS shows 0% charge remaining, does it mean the deep-cycle batteries are completely discharged or that they're at 20%?
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29 views

Would intermittent contact with the service voltage and capacitors in a power supply (inrush current) damage a computer?

If I plugged my laptop AC Adapter power cable into a UPS, causing sparks to blast out (and being unable to insert it due to the UPS being seemingly not designed for this type of plug, for whatever ...
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4answers
3k views

Is it possible to test an UPS battery without having the UPS nearby?

I just started with a new company and they have a stack of replacement batteries for UPS's located at the branch offices. The problem is, no one knows if these batteries are good or not, and the ...
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66 views

Agghhh! UPS Back-Up, Laptop Charger, Sparks

Boy… ok. This is so frustrating! Ok so, I've been getting a whole lot of problems with the electrical grid here lately: spikes, surges, lows, brown-outs, all kinds of problems, it's terrible, ...
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3answers
3k views

Why PC reboots when there’s a power failure even with UPS?

I've purchased a Line Interactive UPS 1200VA. It's supposed to give 8~20min backup (as written in the manual). This UPS has transfer time < 10ms. It works fine when the mains is active. But the ...
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1answer
44 views

Choosing the right UPS

I'm trying to determine the size of the UPS I should buy. Ideally, I would like something to keep my system on for an hour in case of a power cut but I don't have the budget for that. Basically I want ...
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2answers
6k views

What Is AVR Mode In UPS Software Management?

When UPS was disconnected from power source and 25W desk lamp was connected to it, all was normal: But as soon as i have unplugged it and plugged in 95W fan, AVR "Normal" changed to up arrow: ...
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2answers
202 views

UPS - practical maintenance advices to help end-user keeping batteries (classic lead acid models) in good shape

I have read that most (maybe all?) UPS devices for personal computing have lead-acid batteries inside. As long as its chemistry, compared to lithium-ion, is very different, I would like to know ...
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8answers
2k views

How to determine what size backup power equipment is needed?

I want to have an optimum continuous supply for my small office for 6hours, which includes, a laptop (AsusG73SW-> 8Cells : 5200 mAh 74 Whrs; Output : 19 V DC, 6.3 A, 150 W; Input: 100-240 V AC, 50/60 ...
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1answer
13 views

Computer running Windows 7 with a Ouragan Neo900 UPS

We have a number of power issues here on Mauritius and I wondered if there is any software that, when the UPS kicks in during a power loss, can then safely shut down my computer as although I ...
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1answer
548 views

APC UPS will not work with Vista

So I bought an APC UPS BE550G the other day, I plug it in, it works fine, I can unplug it the battery keeps my computer going. Fine. What does not work is the software (or any other software that I ...
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274 views

Low capacity on UPS model Hantol HU1000 for PC

How should one care about UPS (do maintenance of UPS) for a home computer? I am asking because after one case where UPS was discharged fully (till it was empty), it now does not hold the power: it ...
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3answers
1k views

Detecting when a server is running on UPS battery

I have a home server (HP Proliant ML310 G4) that I bought from my employer a month or so ago. The server runs Debian Linux and I use it for just about everything. I can get away with doing this ...
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3answers
3k views

computer shutoff suddenly, I have a APC backup UPS SE 350

My computer suddenly shutoff (abruptly), and then the APC (UPS SE 350) started to beep continuously. I pressed the button on it and it stopped, then I pressed it again and it turned on (green light) ...
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Using Perl to communicate with Nut

I'm trying to communicate with my UPS that's managed using NUT. I want to read values from it like line voltage, battery charge, etc. I don't want to send it commands to shut it down. At first I was ...
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2answers
111 views

UPS will work on power but not battery

I have an old APC Back-UPS 200 I'm hoping to use for my PC. Connected to power it works fine. When unplugged it emits a "i'm on battery power" constantant tone. The 2 plugs on the back are not ...
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91 views

Reboot after power failure not working

My bios (american megatrends) has an option to reboot after power failure which I have set only it doesn't work. I have a UPS which shuts it down correctly and then disconnects the power. When power ...
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17 views

What should I look for in a UPS to protect my system from outages and surges? [duplicate]

Lately my computer has been subject to numerous power outages due to unstable power in the area. It has started to cause damage to my GPU and has had other impacts on file integrity (the drivers for ...
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4answers
8k views

APC ES 350 - continuous alarm

Continuous alarm on ES-350, power light (green) blinking. There are no other audio/visual indicators. Circuit breaker button is popped out, won't reset, attached devices have power. Power cycle and ...
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6answers
18k views

APC UPS Overload light blinking and constant alarm tone

I have a Back-UPS XS 900 on a standalone Debian server that seems to randomly start sounding a constant overload alarm, even with nothing plugged in. The alarm continues to sound until I manually ...
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2answers
158 views

APC Back-UPS overload

I contacted APC to ask this question, but it has been 5 days with no response. My question is simple: I have an APC Back-UPS ES 750 (450 watts), but let's say I want to plug something that draws more ...
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78 views

How to set shutdown criteria for network ups tools in Debian Jessie

I have installed the nut-server and nut-client pagages for debian and I do have communication with a dell ups. I can send shutdown and start commands via upsdrvctl and the UPS is fully supported ...
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64 views

How to restart nut-server on Ubuntu after USB communcation has been established?

I got Eaton 3S UPS which is connected to my Ubuntu 13.10 system thru USB. Ubuntu communicates to UPS with nut-server. However, when PC is started, it looks like nut-server daemon is started before ...
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274 views

UPS shuts down when using with modem alone

I'm in a place where power cuts are very common for around 5 hours a day. I have a DSL internet connection and a PC. I recently purchased a new laptop which easily gives me 4 hours of battery backup. ...
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45 views

In vs Out ethernet jack on UPS

On my Cyber Power 825 AVR UPS it has two ethernet connections: one labeled in and the other labeled out. What's the difference?
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57 views

Making Advice PRV-850 quiet

I've recently bought the Advice PRV-850 UPS. It works as expected, but when there's a power drop, it constantly beeps and I don't know how to make it quiet. I had a different model of the Advice UPS ...
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75 views

Is daisy chaining UPSs safe? Does it add any benefit or cause more problems?

Is it safe and is their any benefit to daisy chaining multiple UPSs together?
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141 views

Mustek PowerMust 600 USB - replaced battery, dies in half a minute

I am having problems with my UPS. Recently changed the battery because I wanted to get a longer lifetime before power down. I purchased the following battery CSB GP1272: ...
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80 views

When unplugged, the UPS plug gives out current. Is it bad? [closed]

We have several power issues in our house like : Occasionally loosing bulbs (in two holders, the light bulbs went out two times. If we put a new one, it will go out after several days. One went out ...
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1answer
366 views

apcupsd on Linux does not report on APC BackUPS Pro 900

From what documentation I could find, the UPS should be (is!) supported by Linux and ought to work with apcupsd. I looked for specific problems such as the infamous Microlink protocol, and found none. ...
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79 views

Should The Plug of UPS Always Plugged?

Which is better for lifespan: Switch off the UPS and plug off or Switch off the UPS and leave it plugged in. Consider this two statements and give seperate replies: Which is better for >1 Month ...
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3answers
1k views

Is my UPS battery dead or is my UPS broken?

When the lights went out today I noticed my UPS battery didn't work. I checked the monitor and this is what I see: As you can see it says the battery has 90% but when I pull the plug, it doesn't ...
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3answers
1k views

Protecting my PC and NAS units in the event of a power failure

The UK village where I live has what can best be described as a very flaky power supply -- I can expect a brown-out once a week, and a power cut maybe once a month. In the last-but-one power-cut, one ...
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4answers
11k views

Why shouldn't I attach laser printers or scanners to a UPS?

I have an FSP EP1000 UPS. The User's Manual says: CAUTION: NEVER connect a laser printer or scanner to the UPS unit. This may cause the damage of the unit. Why is this restriction?
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1answer
143 views

Should I use uninterruptible power supply for an external HDD?

Should I plug in my external HDD into the UPS outlet instead of a regular outlet in the wall to prevent data loss in case of power disruption? My UPS already has a PC and a monitor on it, but I only ...
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97 views

Line Interactive UPS battery maintenance

I am going to buy a Line Interactive UPS (around 600VA/360W with one 12V/7AH Lead Acid battery - probably PowerWalker VI 650 LCD, or Cyberpower Value 600ELCD, or any other...) for my PC needs, and ...
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3answers
277 views

Need UPS communication software for Ubuntu

I have a server that should have an energy backup. I want to use some UPS for this. How to make it can communicate with PC, so it can makes the PC shutdown automatically? Whats software for ...
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3answers
477 views

Boot issues after thunder storm

The village where I live was sat under a thunder cloud for most of Friday, and we suffered a few power fluctuations (specifically, what seemed to be split-second outages). When I got back home from ...
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2answers
841 views

Is it okay to use a UPS without a ground?

I have a UPS unit that I would like to use for a workstation installation that does not have a valid ground (in the Philippines, a true ground is a luxury). I am not an Electrical Engineer, but I ...
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1answer
136 views

Unknown UPS back-up issues

I have a Powercom UPS IND606A. I am staying in India having voltage range of 230. The detail explanation of problem :* When there is a powercut UPS gives back-up but it restarts the computer. ...
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16 views

What size UPS do I need? [duplicate]

Trying to figure out what size Uninterrupted Power Supply (UPS) I need to keep my machine on in the event of a power outage (or on long enough to save what I'm doing before shutting down). Needs to ...