With power supplies set to 27v, we do tend to see it drop by a few volts when it switches to battery power - we actually use that to monitor when we're running on batteries.
I guess the voltage going to high might be a problem if you had a really small load though. Ideally, I suppose you'd want to keep it regulated so that the voltage doesn't drop too low either, but when you're dealing with gear that's intended to run on PoE, it typically is designed for a pretty wide voltage range, just to be able to deal with differences in cable length. On Wed, Jan 16, 2019 at 7:33 AM Ken Hohhof <af...@kwisp.com> wrote: > Traco TSP-BCMU360 fed from a 24V power supply), or integrated TSPC > 240-124UPS, will provide regulated 24 VDC while charging and managing a 12V > battery string. Not recommended for sites with a large power draw. > > > > Phoenix Contact has a DIN rail UPS series that provides regulated DC > voltage, but it jumps to the battery voltage when running on battery power, > which kind of defeats the purpose. Except I guess that battery voltage > will not be as high when it is supplying power rather than being charged? > > > > > > *From:* AF <af-boun...@af.afmug.com> *On Behalf Of *Mathew Howard > *Sent:* Tuesday, January 15, 2019 10:12 PM > *To:* AnimalFarm Microwave Users Group <af@af.afmug.com> > *Subject:* Re: [AFMUG] Meanwell UPS AD155B > > > > Any of the current UBNT products will handle 27v just fine. > > > > On Tue, Jan 15, 2019 at 9:21 PM Rhys Cuff (Latrobe IT) < > r...@latrobeit.com.au> wrote: > > > > Hello > > > > I use Meanwell AD155B’s to charge and run my 24V load. > > Unfortunately the charge voltage is a tad high for the ubnt products I use. > > > > I use a DCDC converter to go from 27v down to 24v > > > > Is this the recommended solution? Seems a waste just to drop 3v > > > > Does anyone know of a more suited PSU/charger/LVD unit? Perhaps with > adjustable charge and load voltages. > > > > Thanks > > > > Rhys > > > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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