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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227 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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10 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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25 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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0answers
60 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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1answer
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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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
41 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
186 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
12 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
545 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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1answer
268 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 ...
22
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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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0answers
13 views

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
86 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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1answer
77 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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0answers
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
17k 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
124 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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0answers
70 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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220 views

UPS monitoring in Debian with nut

I am looking to set up nut (version 2.6.4-2.3) to monitor my ups in Debian Wheezy but can't seem to find any relevant guides/tutorials. Even the documentation seems to be irrelevant. For example, ...
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50 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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249 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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1answer
42 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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54 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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2answers
69 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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0answers
134 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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0answers
72 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
330 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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77 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
949 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
135 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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0answers
89 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
274 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
471 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
794 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 ...
0
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1answer
133 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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0answers
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 ...
0
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1answer
50 views

In the event of power loss how will the master UPS communicate shutdown to the slave over LAN?

I have got two Ubuntu servers running off a single UPS (APC350). The master server is connected via USB and the slave communicates over Ethernet polling the UPS every 10 seconds or so. I have set up ...
2
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1answer
96 views

My UPS gets very loud when turning on the oven

My UPS starts making a rather loud noise (which sounds a bit like a very loud version of a fridge's motor) when I turn on the oven. It's also vibrating quite a bit when that happens. It's the only ...
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1answer
851 views

Does a cable / adaptor for my needs exist? (photos)

I recently bought a UPS, however, the only outlets take this sort of connector: But, the other end of the cables is like this (right): The thing is, I really need to connect it to a power bar, ...
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1answer
49 views

Server Power Management

I am making a single ssh server, and unfortunately, my area suffers from frequent weather-related power outages. This is going to be a bit of a problem if I want to have a server running unless: a) I ...
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0answers
87 views

How important is it to keep UPS connections either filtered or not?

This question is somewhat difficult to summarize into a good title, so let me explain what I am talking about. I have a setup where an ADSL modem connects to the telephone network. The power supply ...
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1answer
97 views

Can a consumer-level (i.e. cheap) UPS trigger a custom script on power failure on Linux?

I am essentially trying to build is a poor mans server failover solution. The non-profit organization I am part of is planning to host several web applications. In order to save on hosting costs we ...