The SmartUPS series also has a pure sine wave output, whereas the others
use a stepped approximation. Most computer PSUs don't care, but some
will make noise (my old Sun Ultra 2 made a horrible buzzing sound on a
TrippLite UPS, but it worked).
One advantage of the SpartUPS is the ability to handle a broad range of
loads - for instance APC has an app note about using one for inductive
loads (motors, such as a sump pump). Most UPSs will burn out with an
PS: I recommend hitting the APCUPSD website (www.apcupsd.com). Not only
does the driver work well for me, but it has lots of useful information
(such as which UPSs advertised as simple-signalling really support a
subset of smart, which UPSs claim to be USB only but really also support
serial, schematics for most of the weird cables APC uses, etc.).
>>I want to get a UPS for several Linux systems. I need to be able to use
>>signaling so that the machines will cleanly shut down in the event of a
>>power outing. I will use apcupsd to do this.
>>I'm looking at both the BackUPS (USB versions-- the RS and the Pro) and
>>the SmartUPS from APC. The SmartUPS seems to cost a factor of two more
>>than the BackUPS (for a given power rating), but from apcupsd I can't
>>tell what the difference is.
>>*Is* there any practical difference between the BackUPS and SmartUPS if
>>you're using apcupsd? If so, what is it?
> Look at the detailed specs for the units as stated on APC's website.
> There's some variation in estimated runtime (comparing BackUPS Pro 1000,
> BackUPS RS 1000, and SmartUPS 1000), especially at half load. There's
> also some variation in surge supression specs.
> But the main difference is the manageability and upgradability of the
> SmartUPS line. They have a "Smart Slot" for optional items such as
> network (SNMP) management (instead of serial/USB), environmental
> monitoring, and so on.
> IOW, with the SmartUPS line you have the option of upgrading to add
> features which are important for use in a data centre whereas the
> BackUPS line is targeted more at office use.