Re: [AFMUG] Still need help 50v DC regulator 6-10A

[Bill Prince]

+1. If the Metrolinq thing is the only thing with the weird power restriction, I'd fall back on Chuck's suggestion to use a zener diode to drop the voltage to something it would tolerate. Then you could use conventional 48VDC (which can go up to 56VDC) for everything else. bp <part15sbs{at}gmail{dot}com> On 7/12/2019 11:24 AM, Ken Hohhof wrote: Sterling, are the MetroLinq thingies the only equipment at the site that can’t take 54-56 volts direct from the batteries?  And how much of the 6-10 amp load do they represent?   I think I’d try to find a way to run everything else directly off 56V and use a DC-DC regulator only for the MetroLinqs.  You could even give each MetrLinq its own much more modestly sized DIN rail DC-DC converter.  Running all the other equipment through a DC-DC converter for no good reason will just waste power, generate heat, and reduce battery runtime.   Of course if the MetroLinqs are 80% of the total power, that’s very different, never mind.   Oh, and given your power budget and equipment list, I’m not sure I’d call this a “mini POP”.  Not so mini.     From: AF <af-boun...@af.afmug.com> On Behalf Of Forrest Christian (List Account) Sent: Friday, July 12, 2019 1:45 AM To: AnimalFarm Microwave Users Group <af@af.afmug.com> Subject: Re: [AFMUG] Still need help 50v DC regulator 6-10A   I should have probably included that datapoint.   However, in bench testing here, I've found that the larger SD series tend to have less of this problem, I think just because the amount of inrush required to trip the overcurrent protection is higher on the higher powered units.   Still a concern though.   I also know that modern radios tend to have smaller input capacitors since the regulators are better.  This means less inrush.  So the SD series is definitely YMMV.   But this is also true of any power supply with overcurrent shutdown as opposed to foldback.   But... I sure wouldn't consider the SD series in the range where the RSD series operates.   In the higher current range, I'd probably test to verify that a full power cycle won't result in the SD tripping, and possibly oversise (i.e. get a 1000W one instead of the 500W one).   -forrest   On Fri, Jul 12, 2019 at 12:31 AM TJ Trout <t...@voltbb.com> wrote: Meanwell SD series is widely reported as defective. They can't handle any inrush current without going offline without an auto recovery FYI.   On Thu, Jul 11, 2019 at 10:06 PM Forrest Christian (List Account) <li...@packetflux.com> wrote: If you're willing to burn up around 20-40W of power you could also add a high voltage linear regulator.   Or a couple of diodes in series.   However, all of those will turn the excess voltage into heat, which is what the 20-40W is...  2V@10A=20W.   For The amount you're talking about power wise, the meanwell SD series is probably your best bet.   Almost all of the meanwell supplies have a din bracket mounting adapter available, although I'm not finding the one for these.   The RSD series definitely has one but only goes up to around 350W.   On Thu, Jul 11, 2019 at 3:00 PM Sterling Jacobson <sterl...@avative.net> wrote: Sorry to beat a dead horse, but I’m still stuck on this mini-pop DC plant thing.   Is there a DIN mountable voltage regulator that will allow me to feed load from 48v battery string without going over 50v at 6-10A?   I’m still trying to power a couple of MetroLinq 2.5 antennas at the site, but people tell me they explode if given more than say 52v.   Which means my float battery system will kill the radios if it goes into recharge mode at 54v?   Or am I overthinking things?   Looks like to solve this I would need something like Mean Well $100 SD-350B-48 between the battery array and the load to assure it sticks around 50v.   Is that my only solution here?     -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com   -- - Forrest -- 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   -- - Forrest

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