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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My 650va UPS is overloaded

I bought a secure 650va UPS but it is not working good. I tested it by charging it to 6 hours and plug in my PC without monitor just the cpu itself but when i tested it to cut the power off by ...
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42 views

What about placing a voltage regulator behind an UPS with modified sine output, to protect an active pfc psu?

I moved to an area/building where there are quite some problems with the wall-power supply. Primaraly I would like to protect my computers, secondary I would like have some affordable UPS for some of ...
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1answer
29 views

APC Smart Ups Series differences [closed]

I'm trying to understand differences between between APC Smart UPS Series and APC Smart UPS C series. The only thing I noticed is C series have no expasion slot. Are there some other practical ...
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4answers
94 views

Is it necessary to use UPS? [duplicate]

I'm current using Corsair VS 550 (550 watt) power supply unit ,but i don't have any UPS. Is there any chance that my power supply unit and hard disk could be damaged for not using any UPS.can anyone ...
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2answers
27 views

UPS with bad battery - okay to keep computing a while?

My APC ES 350 UPC is beeping continuously, with an LED alternating red/green. Nothing happened recently, just normal everyday functioning. According to a quick web search, this beep and blinking ...
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1answer
38 views

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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1answer
74 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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35 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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61 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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87 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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120 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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23 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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2answers
43 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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0answers
98 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
59 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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1answer
14 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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2answers
264 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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3answers
2k 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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16 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
243 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
130 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
19 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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8answers
3k 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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2answers
349 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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113 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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89 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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1answer
60 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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68 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
110 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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187 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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101 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
490 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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87 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
2k 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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1answer
169 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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115 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
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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1answer
3k 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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105 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
54 views

Ups not going on battery

I've got a new UPS for my computer and I experienced the first power outtage today. I had previously tested the battery once fully charged by shutting the appropriate breaker down and it went on ...
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1answer
119 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 ...
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1answer
103 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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319 views

Why is my UPS causing my monitor to make a high pitched humming noise

I recently purchased a UPS for a new server build for my home. Since the server sits next to my desk, I figured I'd plug my Macbook and monitor into the UPS as well. That way if the power goes out, I ...
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0answers
17 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 ...
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0answers
353 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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347 views

PC crashes with Power LED Blinking at 1 Second Interval

I have a "server" that recently has started crashing around once a week. I have yet to find a reason for the crashing but the nonrecoverable nature of the crash is unusual. The machine is standard ...
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1answer
50 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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40 views

Voltage regulator

Recently a friend installed a regulator on my Mac Computer. I used it to 'safely' shut down the computer when a sudden thunderstorm occurred. The Mac in question was old by computer standards but up ...
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3answers
136 views

Will a UPS switch power off all connected loads in one action?

I am going on vacation and was going to buy a power supply cord with a disconnect switch to power OFF all my equipment, eliminating phantom load. Can I use the OFF/ON switch on my UPS to perform the ...
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198 views

Protecting Against Inrush Current

In my apartment, the main circuit breaker has a very low amperage limit of 5A (220V), with a maximum power limit of 1300W. Therefore, about 75% of the time I plug in my PC power plug, the inrush ...