Questions tagged [ups]

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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Restart Linux server on UPS after power restored

I have a Linux server on a UPS using network UPS tools (upsc). When there's a power failure, after the battery runs low, it issues a shutdown command to the server, which is fine. But when the power ...
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23 views

Can I use higher capacity batteries in an Online UPS?

I have a Farber 1KVA Online UPS that uses a pair of 12v, 9AH batteries that are connected in series. the power goes off a lot in my area and the batteries can't keep my PC on more than a minute during ...
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Why can’t a 650w rated UPS can not power my 350w computer on main power failure

I have a computer that could potentially draw 350w on high load. Due to main failures often, I grabbed 1,000va (650w rated) UPS from Emerson. After fully charging the UPS battery, I have done self ...
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49 views

Can a power outage damage PC hardware?

TL;DR: can a planned "power outage" damage PC hardware aside from HDD/SSD (which won't be connected to the PCs) - mobo, gpu, cpu, psu, dvd, fans? (the internet says "yes it can" vs ...
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60 views

Can UPS be dangerous for my pc?

Can UPS be dangerous for my pc? I am using this power supply in my pc: SilentiumPC Supremo FM2 750W 80 Plus Gold I am using this UPS to power my pc and monitor: Green Cell UPS (2000VA/1400W, 3x IEC, ...
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54 views

HDMI blinks when UPS switchs voltage

I have an RX580 and two monitors; one connected to the HDMI output and the secondary to a DVI-D port through a DVI-D to HDMI adapter. The PC and the main monitor are connected to an UPS and the ...
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92 views

Pc reboots while connected to a UPS and no power failure

UPS model: TRV NEO 850 power factor is 0.6 220V transfer time is 2/4 ms i have the ups connected via usb and the monitoring software show no problems at all (battery ok, ups load no more than 70% ...
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46 views

UPS Voltage fluctuation from 240 to 220 Volt [closed]

Dear readers from this forum. I live in North East Thailand. I do have 4 UPS units from "Etech EGO" (1000 VA 500 Watt). I have 3 phase electricity which wil give me 240 to 250 Volt on ...
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Is it possible to purchase a UPS whose alarm can be disabled? Or must I physically disconnect the speaker by disassembling and modifying the unit? [closed]

I am working in a setting where we can expect to lose power several times a day and I want to get a UPS (uninterruptible power supply) in order to keep the computers running. Are there any ...
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Even with a UPS my oc reboots at power failure

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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Anyone know how to configure an APC UPS network management card when you don't know the IP address?

I bought a refurbished rack mount APC UPS and a network management card for a home lab setup. Thought the setup would be pretty straightforward but it's turned out to be a huge headache. First of all, ...
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UPS turns off at power loss

My brand new UPS doesn't power my computer at a power cut. I plugged it to the power socket and let it charge for a good amount of time. But it simply turns off. My PC has a 500W PSU and the UPS is ...
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How to estimate backup time provided by UPS?

I have been trying to estimate how much backup time a UPS would provide to a laptop, but I'm unable to understand what variables I need to take into consideration. From the laptop, I know that the ...
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176 views

Why is my UPS not providing power to my Modem?

I have a UPS that was powering my Monitor and CPU unit whenever main power was failing. I also have a modem that provides internet connection to the entire house. Now, the modem gets power from mains, ...
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125 views

UPS vs PSU wattage during normal operation?

Does a UPS battery backup act as a "funnel" for wattage during normal power operation (e.g. full power is coming from the wall outlet to the UPS)? I ask because I have an older UPS with only ...
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107 views

Can I use an USB hub to use the same UPS or printer for multiple computers?

I'd like to use the same UPS for two small computers. My main problem that I need the battery info for both computers to shut them down when the battery is close to empty. I thought maybe I connect an ...
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Computer Does Not Work At Home But Works in PC Repair Shop

I have never encountered this phenomenon. No, it's not phenomenon - it's anomaly that defies logic. My computer was left for 1 week in a mixed standby hibernate state. I think it's S4, don't remember. ...
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86 views

Infotec X4 on Ubuntu with NUT

I am trying to connect an Infotec X4 UPS to NUT on an Ubuntu server. The UPS is correctly recognized by ViewPower software on a Windows laptop. This allowed me to conclude that the USB interface works ...
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77 views

UPS any of the indicator lights not turning on

I have a prolink UPS pro700 model. I could not use it for around 4 to 5 months ( left alone unused ) and when I try to plug it in and turn it on, non of the indicator lights are illuminating. I know ...
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304 views

My UPS can't handle PC load sometimes, what's wrong?

So I recently built a PC and with it, I bought a cheapish 600W UPS. My PC on PCPartPicker showed that I required around 330W to use it properly (I went with a 700W PSU). I also have my monitor and ...
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919 views

I can feel the electricity on my pc case [duplicate]

I have a pc that is connected to a UPS and connected to the outlet. When I turn on the UPS while holding the pc case I can feel a small electric shock, also when the UPS is on charging mode I can feel ...
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Shutdown of Mac (10.14.6) not working after upsmon (UPS connected to Synology) issued it -only works under sudo

The problems: Shutdown triggered from upsmon does not shutdown my Mac, the shutdown command still seems to require sudo. all upsmon messages are shown only to user nutmon, not to all users in case of ...
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41 views

UPS gives power without being switched on

I am using Intex Protector 275 UPS. When I connect it to power source, it automatically gives power to its output devices without switching on the UPS. This problem started today and I'm not able to ...
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91 views

Replaced batteries in CyberPower 1350AVR UPS, now it resets every 5 seconds

I have no idea what is causing this, and the CyberPower website doesn't even list this particular issue in their list of "all beep codes". All I did was take out the old batteries and replace them. ...
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Cyberpower UPS - huge drop in battery when switching to battery power

I just acquired a CyberPower OR1500LCDRM1U UPS device from eBay. It was said to be open box and not used, but I have my doubts. I have it installed, and am putting a 30% load on the battery. With the ...
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55 views

UPS on DC lines [closed]

How could a UPS switch between battery and AC wall socket fast from around 4 ms to 12 ms. What make it especial to switch in that very low time. As far as I know it has relays inside it to perform the ...
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320 views

GPU fails on because UPS

I got a new UPS not long ago, and installed it's software (upsilon 2000) and driver. the software installs a battery driver for the UPS so I can use windows power plans settings to control what ...
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56 views

APC UPS Replacement Battery

I have an APC BE550G UPS with a battery which is 4 years old (the model is RBC110) and I would like to replace it. I believe the current battery capacity is 7AH, and I was thinking of replacing it ...
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53 views

How comes all three protection levels (electric board, UPS and AC block) get passed through?

So, there is that house in France with three phase electrical power. I don't know if this is relevant. And I can't tell the whole installation was set properly. But the grounding is recent and strong. ...
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638 views

UPS power cord is giving electric shock only when computer is running using UPS back up power supply

I brought a new desktop along with an UPS. I plugged monitor power cord and CPU power cord both in UPS and UPS is not connected to any power supply. Then I have Started the UPS and my computer started ...
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185 views

Dell PowerEdge R710 reboots when UPS kicks in

I have a Dell PowerEdge R710 that I inherited from my company when it was retired. I have it protected with a CyberPower UPS, but every time there is a power failure, the server reboots. I have tried ...
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431 views

APC Smart UPS, Synology DS918+ and Mac mini

I have a new APC Smart-UPS C 1000, a 2018 Mac mini, and a Synology DS918+. I am trying to figure out if there is a way that when the battery gets low, the Mac and the Synology can both safely shut ...
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809 views

How to power on a computer after a power failure?

Background I have a Ubiquiti Network Video Recorder (NVR) connected to an Eaton 3S 550 UPS. The NVR is basically a tiny PC running Debian, which records video from network cameras on the LAN. My goal ...
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65 views

UPS makes a clicking sound and my Network Connection stops

My uninterruptible power supply (UPS) makes a clicking sound then my network connection stops, what can I do to fix this problem?
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47 views

Throubleshooting UPS

I recently rescued an MGE 2200 VA UPS. The UPS has the batteries dead (extremely dead), as it has only 0.5V out of 72V (6x12V). Obviously, it has been unplugged for a while. When I plug the UPS to ...
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23 views

How do I load test large UPSs?

I'm currently the only hardware repair person at my work and I've been left with a pile of UPSs that need to be fixed and tested. As it is I've been load testing the smaller (250-500 watt) units using ...
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3k views

How to shutdown macOS / mac OSX from Network UPS Tools client - NUT

I’m looking for help in shutting down my iMac on detecting a power failure while running from a UPS. My setup is an APC SMT750i UPS, powering two Synology NASs, and iMac plus the network kit (router, ...
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Why would my internet speed increase when connected through UPS?

The past few places I've lived over the years I've noticed a strange phenomenon: when I have my coaxial cable internet connection passing through the coaxial on my UPS and then into my modem, the ...
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43 views

UPS supply cuts power at POST if connected to server via USB

I am using an EATON 3S 550 on a Server that uses 60W when idle It is an Intel Celeron G3220 on a Intel DH87RL. Due to the six harddrives the power used at boot is higher, but certainly below 550W, ...
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45 views

What kind of UPS do I need? [closed]

I've been looking into different kinds of UPS solutions. (Standby, Line-Interactive, Standby-Ferro, Double Conversion, and Delta Conversion UPSs) So far I think I've narrowed it down to Double ...
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59 views

Determining UPS power rating to use for a SME data centre

I'm doing this the first time. I'm trying to understand what power rating of a UPS to use, the scenarios is that I will have 4 Dell PowerEdge R440 rack servers, each server has a Dual Hot Plug ...
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2k views

Should the UPS output be exactly same in normal and battery backup modes? Or it is normal to have a slight variation in voltage or something?

My 10 months old PC ran into a problem some days before. My system specs are as follows: Intel Core i7-8700 Processor MSI Z370-A PRO Motherboard 8GB RAM Here are the details about the issue. Most ...
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2answers
1k views

Trying to connect to Tripplite Smart1500LCD UPS with NUT on Raspberry Pi 3 B+ via USB. The device keeps disconnecting and reconnecting

I have 2 Tripplite Smart1500LCD UPSes and 2 Raspberry Pi 3 B+ boards running Raspbian GNU/Linux 9 with kernel 4.14.79-v7+. I am experiencing the same problem with both Pis with both UPSes. I am using ...
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851 views

Disabling repeating battery failure alarms on an APC Smart-UPS

I have an old APC SU700I with batteries which were failed on the self-test. Its manual says the following: THE REPLACE BATTERY/BATTERY DISCONNECTED LED IS ILLUMINATED Failure of a battery self-test. ...
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UPSmart always gives “connection failure” when connecting to UPS through USB

I want to connect UPS (Irbis ISL1000ET) to OS (Ubuntu 18.04), so that when power is off and battery is low, OS shuts down automatically. However I cannot do this - I installed with superuser ...
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2k views

Cannot access Web UI for Eaton UPS Network-MS card on 172.x.x.x network

I have an Eaton 5PX1500RTN UPS with a Network-MS card installed and I could access the Web UI when I first set it up during initial testing on a 192.168.1.1/24 network. I made sure that I used DHCP ...
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302 views

UPS configuraton — master/slave

I recently bought a Eaton 5PX1500RTN UPS(1440VA/1440W) with a Network-MS card. I connected it via ethernet and can now see the Web UI for Eaton. This thread here gave me confidence that the UPS would ...
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70 views

I have a 450 UPS, will it be enough to let me safely power down my 600watt psu computer?

I don't need to use it, just turning it off if a power outage happens is enough for me.
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5k views

UPS turning on and off repeatedly

I'm using an Intex Protector UPS. When I push the power button it starts with a beep, which is normal, I know. But when the beep ends, the light which shows power turns off and button remains pressed. ...
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624 views

How to correctly install libusb-win32 for PCM RPT-800A UPS?

I have a PCM RPT-800A UPS, connected to a Windows 2012 machine. I would like to use NUT for communicating with the UPS.  But shortly after installing libusb-win32 for this UPS, the device in Device ...

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