Questions tagged [ups]

uninterruptible power supply

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2 votes
4 answers
17k views

Will a NEMA L5-20P plug work in a NEMA L5-30R receptacle?

I need to purchase a UPS & PDU and want to know if they will be compatible. Will the plug of the PDU be able to plug into this UPS? The UPS: APC Smart-UPS X 3000VA Rack/Tower LCD 100-127V with ...
0 votes
1 answer
90 views

nut client configuration issue

There are 2 UPS NUT servers running in my rack. 1 is running on TrueNAS SCALE and another is running on Synology DS918+. And there is a NUT client running on a ubuntu server. The NUT client keeps ...
1 vote
2 answers
2k views

Dell Powervault ME4 (ME4024): unattended shutdown possible?

I'm rather new in this world of SAN devices/ESXi hypervisors and stuff. Some years ago we had had physical servers with internal storage connected to a USB/LAN UPS and whenever he had a power loss we ...
0 votes
1 answer
110 views

GreenCell PowerProof 600VA UPS not taking mains power

I have a UPS that when on and plugged into mains power, continues to indicate no input power and running from battery. Is it a fault or user error?
1 vote
0 answers
56 views

APC change to smart slot / card interface

I bought a new APC SMT1000C 1000VA UPS, which has the smart card interface on the back. I was planning to reuse my old AP9606 network card, but I discovered that APC has modified the slot to block ...
2 votes
2 answers
4k views

How to shut down Hyper-V Server 2008 R2 from acpupsd?

I have several computers connected to a single APC SmartUPS 1500. The UPS status is monitored by a server running acpupsd. The other computers also have apcupsd installed, and poll the main computer ...
10 votes
2 answers
10k views

How can I calculate if a UPS is sufficient for my requirements?

I am not that of an electricity knowledgable person, so I'll try to put as much info as possible. I have a Rack Mount UPS of 1800 Watts Model: PRP 3050 RM (in total I have 2 of these - talking about ...
1 vote
1 answer
2k views

apcupsd doesn't show voltage with "SmartUPS 1000 LCD"

I'm trying to config apcupsd on my Ubuntu 10.04 Server, I've got an "APC Smart UPS 1000 LCD" connected via USB ( Bus 003 Device 003: ID 051d:0003 American Power Conversion UPS ). My apcupsd.conf file ...
0 votes
1 answer
299 views

USB peripherals reconnecting and finally disconnecting when on battery power with CyberPower CP1500EPFCLCD UPS

The following happens with my brand new, fully charged CP1500EPFCLCD UPS by CyberPower if I cut power to it (with the home circuit breaker): After a few seconds, my USB mouse starts reconnecting (i.e. ...
6 votes
2 answers
6k views

How can I fix my UPS repeatedly disconnecting and reconnecting?

I'm running a nut server connected to a Tripp Lite SMART1500LCD by USB. The device is behaving unexpectedly and I can see these kernel messages: user@host:~ $ dmesg -T [Wed Dec 4 13:24:24 2019] usb ...
-1 votes
1 answer
38 views

How to test a battery outside a UPS [closed]

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 ...
1 vote
0 answers
794 views

UPS network shutdown for Synology and ESXi, USB UPS

I have had a USB UPS for a while now and although I've never had a power outage with it and my Synology NAS, in testing it's worked great connected just with USB to the NAS. Now I've added an ESXi ...
1 vote
1 answer
683 views

Shutdown Multiple Servers From One APC USB Port - Power loss event

I've got one Ubuntu box and a Synology NAS. Both are connected to the APC UPS, but only one USB, which is connected to the Ubuntu box. How, specifically, can I get both machines to shut down from a ...
1 vote
1 answer
195 views

Splunk SNMP Modular Input

I just installed this app and found it simple to setup...but I most be doing something wrong. I've created Trap information on my two UPS devices and haven't had any luck bringing them into Splunk. I ...
6 votes
4 answers
8k views

ZFS - enable or disable disk cache?

I'm setting up ZFS (through FreeNAS) with RAIDZ1 on a server with 4 x WD Red SATA HDDs (connected through a PERC H330 in HBA mode). The server is hooked to a UPS. For ZFS and in this setup, does it ...
0 votes
1 answer
631 views

replace APC smart signaling cable with RJ-45 to RJ-45

Is it possible to replace the APC Smart Signaling Cable PN: 940-1525A with an RJ-45 to RJ-45 cable? The cable is built as an RJ-50 to DB9, but I need to connect it to a console server that only uses ...
19 votes
4 answers
21k views

Replace a UPS battery or buy a new UPS?

Is it worth buying a replacement battery for a UPS or better to buy a completely new UPS? I have heard a UPS is never the same after the original battery dies and is replaced. Is it OK to use a ...
2 votes
3 answers
10k views

Hyper-V 2012 gracefully shutdown when UPS battery running out

Background: We're running a couple of Virtual servers in Hyper-V at a small office using Windows 2008 R2. We only have 1 physical host (and we aren't planning to change that any time soon). We're ...
-1 votes
1 answer
605 views

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 ...
2 votes
2 answers
411 views

Nema 5-20 Female to Nema 5-15 Male Power Adapter for UPS: safe?

I bought a large UPS for my server and didn't realize it comes with a NEMA 5-20 plug. We're in a residential setting and don't have those outlets. I see Nema 5-15/20 Female to Nema 5-15 Male Power ...
1 vote
1 answer
557 views

Newbie to Supermicro redundant PSU

Until recently I have never had a redundant PSU or a rack server for that matter. So, I think maybe I did this wrong? I have a Supermicro FatTwin 6026TT-HDTRF (CSE-827HD-R1400B case) that comes with a ...
0 votes
1 answer
816 views

How to protect 15-amp circuit from UPS with 20/30-amp draw

I managed to pick up a great deal on a CyberPower OR2200LCDRT2U UPS. Unfortunately this box has a NEMA L5-30P input plug (NOT a L5-20P as specified on the product page). In the location I'm trying ...
2 votes
2 answers
66k views

How to clear the REPLACEBATT state from APC UPS after hot-swapping the battery

I replaced a battery in APC SmartUPS by hot-swapping. While the swap was all right and didn't disturb connected computers, the "Battery failed" LED on the front face kept glowing. I tried to use ...
15 votes
7 answers
27k views

Can I plug a 15A UPS into a 30A receptacle?

I know that typically electronics draw only as much current as they need. Is this the case with UPSs? I have a 120 volt, 30 amp circuit, and am replacing the UPS plugged into that circuit with a lower ...
19 votes
4 answers
4k views

Plugging in a server rack with UPSes into a room that has its own UPS backup issues

Thank you everyone who's responded. There's been a common theme in some of the responses that I wanted to clarify since I wasn't clear in my original post. This is an upgrade that will replace their ...
1 vote
1 answer
702 views

Unplugged a working UPS by mistake. UPS made a bang noise and never turned on again

I unplugged my running UPS by mistake. The UPS was new so the batteries were fine, also the load was very low. Could it be that the breaking of the ground path lead to the destruction of the UPS? Now ...
4 votes
3 answers
2k views

Out of band notification when UPS loses mains power?

We're currently looking into upgrading our UPS and possibly having a small petrol generator on site in the eventuality that the UPS battery is used long enough to drain it completely. Realistically, ...
-1 votes
3 answers
201 views

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 ...
1 vote
1 answer
888 views

Grounding of a server rack on wheels

I have a 42HE 19” server rack which houses a bunch of equipment (UPS, PDU, server, network, ...). It has wheels so it’s easy to move and it stands on a concrete floor. The rack is out of metal and ...
0 votes
1 answer
919 views

Is it safe to unplug a UPS during operation? [duplicate]

Interestingly there is no word in the manual and nothing to be found on the internet. But it seems like an obvious question: While a UPS (let’s use APC Smart-UPS 1500RM as an example) drives equipment/...
1 vote
0 answers
38 views

APC Smart-UPS with two battery sets: Regular switches or not?

I have a Smart-UPS 1500RM in a remote location with two battery packs. In order to maximize the lifetime of the battery packs, is it better to Use one pack until it dies and then hope that the other ...
0 votes
1 answer
613 views

Configuring NUT for old serial connected UPS (Tripp-Lite)

I have an old Tripp-Lite UPS (SU2200RTXL2UA) which I need to communicate with via it's RS232 Port (this model doesn't have a USB port). I'm trying to figure out which Serial NUT driver would be most ...
-1 votes
1 answer
192 views

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 ...
2 votes
1 answer
5k views

How to power off a Debian server and a UPS on low battery?

How to configure a Debian server with one standalone USB UPS to: Initiate a UPS power off after one minute when the battery is low. Shutdown itself. And to be sure that when mains power is restored (...
14 votes
4 answers
49k views

Why do I need a raid battery pack?

I'm trying to understand why one would add a batterypack to a raid card. It seems to me like if power goes down, running just the raid card is going to do little good: without power for HDs and ...
99 votes
2 answers
27k views

Smell of rotten eggs in the server room

A week ago I got the following error on my APC Smart-UPS 1000 which I muted. Warning State: Connect battery Load: 55% Batt: 100% Today, I could smell a sort of sulfur/sulphur/rotten egg smell when I ...
-1 votes
1 answer
863 views

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 ...
0 votes
1 answer
6k views

MacOS nut client install for synology network ups

I have an APC UPS connected to my synology nas and I am trying to get my mac (10.13) to connect to the 'network ups' of synology. So far I've been trying to follow this guide: https://community....
51 votes
6 answers
17k views

What are the pros and cons of having your own UPS attached to your own server hosted in a data center?

According to this comment by Tom O'Connor (slightly edited below): You can seriously cheese off a datacentre by putting an UPS inside your own rack. What are the risks to the data center should a ...
0 votes
1 answer
4k views

APC SmartUPS suddenly all lights flashing. What's going on?

upsfault: I have a APC SmartUPS 2U 1500 somewhere in a rack far away. Batteries were replaced recently and UPS was working without issues for a long time. Suddenly yesterday, the entire equipment ...
2 votes
2 answers
14k views

Can't get upsmon service started to monitor (and respond to) remote UPS

I am having difficulty getting my nut install to simply monitor a single remote UPS attached to a Buffalo LinkStation Duo. I can manually correctly read its status using upsc [email protected] and it ...
1 vote
0 answers
338 views

UPS and PDU options for NEMA L6-30P

I have to say I don't know enough about supplying power to a rack. So here goes: This is for a room that will host network equipment (and maybe a server), in an office. Room has: some 120VAC outlets; ...
1 vote
0 answers
337 views

NUT loses communications with the UPS

I am using NUT to monitor my UPS. I have a APC Back-UPS ES 550G, and the NUT server runs on a Raspberry Pi. I use the usbhid-ups driver, which works fine most of the time. However, after a few hours ...
2 votes
1 answer
2k views

NUT UPS-Dummy driver in repeater mode for Synology NAS

I have a NUT client that requires the UPS it monitors to be named ups. The client (a Synology NAS) does not provide a method to change this configuration. My setup consists of multiple UPSes monitored ...
6 votes
2 answers
40k views

How to perform a APC 9617 Reset?

I've locked myself out of an APC 9617 management card. Trying to figure out how to reset the password, or even the card to factory defaults. All the documentation I can find says to connect to the ...
0 votes
1 answer
270 views

Is there a UPS like devices to prevent circuit breaks during short periods of high load?

For example, let's say I have a 10 amp circuit. Under normal load the hardware only draws 6 amps. However, it is possible that the hardware could draw up to 11 amps (for instance during boot). Is ...
3 votes
2 answers
5k views

How to disable UPS energy_saving with NUT?

I've got a Proline 650 UPS (Serial) installed Extra details: The UPS has a serial connection with a single 12v SLA battery. (It was not listed in the NUT compatibility list but after compiling NUT-...
1 vote
3 answers
13k views

APC Smart-UPS turning off by itself?

I have an APC Smart-UPS 3000. Last Sunday, it turned off by itself. Noone was in the office and noone was logged in at the time it happened. What could cause this ? I'm concerned it may happen again....
0 votes
2 answers
1k views

APC Smart-UPS 3000 turning off but passing own test

I have APC Smart-UPS 3000 at home which I got hand and apparently when the power goes down it just shuts down instead of switching to backup. Based on how it behaves I have reasons to believe is not ...
2 votes
2 answers
1k views

What is the difference between the "Write" and "Write+" modes on an APC SNMP card?

I'm configuring a UPS to be controllable via SNMP and have come across to options: Write mode Write+ mode I've tested both settings and only Write+ works for me so it's what I'll have to use. I'm ...

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