It's a peice of test equipment that is dc inside an enclosure with a ac to dc power supply but once and while I need to power it in the field and I can't use ac On Apr 26, 2015 7:13 PM, "Chuck McCown" <[email protected]> wrote:
> Odd. What charges the batts? > In any event, yes, should work just fine. > > *From:* TJ Trout <[email protected]> > *Sent:* Sunday, April 26, 2015 2:02 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] Power supply back feed loss? > > This is not wisp related. I just posted here because you are so > knowledgeable. The power supply will never be on while the batteries are > connected. It's one or the other. The load, the power supply and the > batteries will occasionally all be in parallel when the power supply has no > access to AC in the field. Otherwise normally the load will be powered via > the power supply when AC is available. Is this an acceptable solution? > > On Sun, Apr 26, 2015 at 12:45 PM, Chuck McCown <[email protected]> wrote: > >> When the power goes out and then comes back on you certainly are >> charging batteries along with powering the load. And partially discharged >> batteries can be a huge load. >> >> *From:* TJ Trout <[email protected]> >> *Sent:* Sunday, April 26, 2015 1:37 PM >> *To:* [email protected] >> *Subject:* Re: [AFMUG] Power supply back feed loss? >> >> >> I'm not charging batteries. I just need to be able to parallel a psu with >> the load and batteries occasionally. >> On Apr 26, 2015 7:06 AM, "Chuck McCown" <[email protected]> wrote: >> >>> The whole rectifier shelf, the module or the BC-2000? >>> >>> *From:* Lewis Bergman <[email protected]> >>> *Sent:* Sunday, April 26, 2015 7:55 AM >>> *To:* [email protected] >>> *Subject:* Re: [AFMUG] Power supply back feed loss? >>> >>> >>> I have an extra one of those if you want it. >>> On Apr 26, 2015 8:43 AM, "Chuck McCown" <[email protected]> wrote: >>> >>>> A load of that size really needs a regular telecom >>>> rectifier/charger. They are designed for exactly this application. If >>>> your load is 100 amps, the power supply needs to be probably 120 or 150 >>>> with current limiting so it can pull the load and charge the batts after an >>>> extended outage. Lately I have been using these: >>>> >>>> http://www.eltek.com/us/detail_products.epl?id=1233974&cat=24671&k1=&k2=&k3=&k4=&close=1 >>>> >>>> If you get the BC-2000 controller, you get a nice battery load test and >>>> telemetry option too. You can run the system just on batts for any >>>> specified amount of time and graph the discharge. Shows the life and >>>> health of the battery really quickly. >>>> >>>> >>>> On Apr 23, 2015 11:34 PM, "TJ Trout" <[email protected]> wrote: >>>> >>>>> I have a dc load that I need to power using a switching ac to dc power >>>>> supply but I also occasionally need to power the load from batteries, I >>>>> was >>>>> planning to put the load, power supply and battery clamps in parallel, is >>>>> that a acceptable solution ? Can I power the load from battery and back >>>>> feed DC into the supply without damaging it? Would there be a significant >>>>> drain back into the supply? >>>>> >>>>> If this isn't ok, what's better solution? Diode ? SPDT switch ? >>>>> >>>>> The load is 50V 100A so that makes diodes and switches a challenge to >>>>> find. .. >>>>> >>>> >
