The cleanest power output I've actually metered on the bench was from an Oneac UPS. If I recall correctly they do have a line that feeds the powered device off the battery side, rather than crossing over when the AC source fails. They are appreciably more expensive than a similarly sized APC UPS. Given your use case, they may be a good fit. I recall that they aren't designed with portability in mind, but since I wasn't moving them about I don't recall how awkward/heavy they were. That may or may not be a deal killer.... -Neal Priestly Free Range Technologist On Thu, Aug 25, 2011 at 2:05 PM, Daniel Belmont <dbelmont2 at gmail.com> wrote: > ** Be sure to fill out the survey/skills inventory in the member's area. > ** If you did, we all thank you. > > > > I have a special purpose Linux machine that is used to run musical > instruments and is > used frequently in concert settings ... so preventing failure is of > importance ... I am > looking for advice on two things : > > 1) I need a UPS that produces pure sine waves, has reliable battery backup > that will > instantly kick in during voltage dips, isn't too heavy (or wildly > expensive), rack > mountable would be nice (but I can deal with something that is around 25 > pounds > even if it is not rack mountable), and does voltage regulation ... someone > suggested > that there are UPS's that always provide power from the constantly > recharging > battery -- that could be interesting ... > > The reason I am asking for something with these specific qualities is that > I had a > power outage at a concert this past weekend -- the LInux box was plugged > into a > UPS that puts out simulated sine waves (and the power supply on the Linux > machine > does active power factor correction which needs pure sine waves), there was > a voltage > dip, the UPS battery kicked in and the Linux box shut down as if it lost > power due to the > sine wave mismatch ... apparently this kind of thing can destroy the hard > drive (which > would be a big problem) as well as causing problems for Linux startup (this > did happen > but that problem seemed to correct itself within a few minutes) ... > > 2) what kind of care do I need to provide to the Linux box so that it works > like > a mission critical computer ? the right kind of UPS seems important, > backing > up the hard drive is a given (I am doing this now) ... are there other > things I need > to do to treat this computer well ? again, since it is a musical instrument > I am > very desirous of eliminating all of the possible causes of failure (to the > extent that > I can) ... > > Thanks ! > > Dan Belmont > The Soul Sensations > www.TheSoulSensations.com > > _______________________________________________ > Hidden-discuss mailing list - home page: http://www.hidden-tech.net > Hidden-discuss at lists.hidden-tech.net > > You are receiving this because you are on the Hidden-Tech Discussion list. > If you would like to change your list preferences, Go to the Members > page on the Hidden Tech Web site. > http://www.hidden-tech.net/members > -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.hidden-tech.net/pipermail/hidden-discuss/attachments/20110825/9034e1d8/attachment.html