Based on your description of the problem, looks like you need a "On line double conversion UPS", these normally have the load on the inverter all of the time, there is a conversion to DC, the battery floats on the DC bus unless the mains power sags spikes or drops out in which case it picks up the load, the inverter on these devices is a sine wave output, they used to be larger UPS systems but now you can get them as small as 300 VA (I used 500, 750 and 1500VA units on a lot of my equipment when I worked at the glass plant in Kalama) look around for one with bad batteries, you can usually get them at a good price replace the batteries and you have a good unit that will put put VERY CLEAN sine wave AC to keep your devices happy.
Many of the sine wave output UPS devices are actually these types of units, but always check the docs to make sure, some of them still only switch the inverter in and out when there is a mains issue, run from those. On Thu, Nov 13, 2014 at 5:36 PM, jim karlock <[email protected]> wrote: > Not all UPS reform the sine wave. ALL of the low cost ones I have > played with merely pass through the line, then switch to internal > power when the line goes away. > > My main worry would be over voltage. Get a voltmeter! > > PS: None of those low cost UPS, that I played with, put out a sine > wave - they put out a "modified sine wave" which has a zero volts > time to allow a peak voltage the same as a sine wave, with a RMS the > same as a sine wave: > > --- --- --- --- > | | | | | | | | > - - - - - - - - > | | | | | | > --- --- --- > thanks > JK > > > At 05:15 PM 11/13/2014, David wrote: > >On 11/12/2014 09:45 PM, John Jason Jordan wrote: > > > >< lots of stuff clipped > > > > > > Do I need to be concerned? If so, what kind of line conditioning > > > equipment shuld I use? > > > > > > >I am not an electrician nor do I have a lot of experience with this, but > >I think you would be safe with any of the reasonably priced UPS devices > >on the market as an intermediary. > > > >The UPS should help to reform the sine wave, hence conditioning, the > >incoming signal from the wall to keep your equipment happy, and provide > >a bit of protection from surges as well. > > > >I've read that damage to electronics is caused more by brownouts than > >surges, so in addition to being able to keep the devices up and running > >(presuming no built-in batteries) during the switch from one outlet to > >the other, the UPS will hopefully prolong the life of your equipment as > >well. > > > >david > >_______________________________________________ > >PLUG mailing list > >[email protected] > >http://lists.pdxlinux.org/mailman/listinfo/plug > _______________________________________________ > PLUG mailing list > [email protected] > http://lists.pdxlinux.org/mailman/listinfo/plug > -- Chuck Hast -- KP4DJT -- Glass, five thousand years of history and getting better. The only container material that the USDA gives blanket approval on. _______________________________________________ PLUG mailing list [email protected] http://lists.pdxlinux.org/mailman/listinfo/plug
