UPS for FreeBSD

Paul Pathiakis pathiaki2 at
Wed Nov 26 17:35:52 UTC 2014

If you have a server and you care about it.....

Avoid anything under $750 that is a SIMULATED sine wave/

You need a REAL double conversion sine wave output.  This assures clean 
power and will extend the life of your server and, especially, the PSU.

Right now, I'm trying an inexpensive unit that has two servers, my cable 
modem, network switches, etc connected.

However, I haven't tried to control it.  (It requires an additional card 
for SNMP)  Once I have SNMP, I can use my monitoring system to send a 
text and shut it down.  *shrug*  I would like to have a working UPS 
system that does that. :-)  It does have both serial and USB.

I got the 2kVA unit with 1400 watts.  (My servers only have a total of 
20 disks and they run AMD processors, Gold PSUs, etc.)  Make sure you 
take a quick power calculation to make sure that you have enough room to 
grow.  Also, if you need more time, they have connectable battery 
packs.  Also, each of them come with desk side and rack mount options.

It has been working solid for over six months.


On 11/26/2014 12:12, Warren Block wrote:
> On Tue, 25 Nov 2014, Alejandro Imass wrote:
>> I'm looking to buy a UPS for a server I have at home that will work with
>> FreeBSD and can signal for server via USB to gracefully shutdown when 
>> power
>> goes out.
>> Do any of these work with FreeBSD via USB?
>> - CyberPower Standby CP425SLG UPS
>> - CyberPower Standby CP550SLG UPS
>> - Tripp Lite ECO Series 350VA UPS
>> - Tripp Lite ECO Series 550VA UPS
>> Or any other off-the-shelf inexpensive UPS that I can buy at Staples or
>> Best Buy that will work with FreeBSD via USB to shut down the server
>> gracefully.
> sysutils/apcupsd has worked for me for years on various different APC 
> units.  That said, the black plastic APC units that look like an 
> overgrown power strip are generally not the greatest.  Come to that, 
> cheap UPSs in general are usually not the greatest.  Some will 
> overcharge batteries, requiring replacement in two years or less.
> The apcupsd web site ( has some information, 
> but does not appear to list supported model numbers. APC had used a 
> proprietary unsupported protocol on the higher-end SMT models, but 
> appears to have now included a supported protocol.
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