Re: [Repeater-Builder] RS Astron up to 15 volts, will it be ok

Tue, 07 Jun 2005 19:10:50 -0700

Dave,
 
Did you ever run into the problem of back feed from the batteries damaging the regulator chip during AC failures?  In my case Astron specifically told me not to float the batteries in parallel with an RS-20M because of that potential problem.  This Repeater Builder article discusses the issue and a mod.
 
Astron does make their linear supplies in a battery backup model which uses essentially the same network that Matthew has.
 
I whole-heartedly agree that floating a supply across the battery string (if the supply will tolerate such) is the ideal.
 
 
Doug
----- Original Message -----
Sent: Tuesday, June 07, 2005 8:42 PM
Subject: Re: [Repeater-Builder] RS Astron up to 15 volts, will it be ok

At 08:29 PM 6/7/2005, Mathew Quaife wrote:
>Hi Doug, you might be right on the drop, I was taking it from memory
>as it was nearly 4 months ago that I had them hooked up.  As for as
>amps, the repeater keyed up draws right about 22 amps according to
>the meter on the astron.  I have never put another meter
>inline.  And yes, I want to be able to use the batteries and keep
>them from killing the power supply if they should ever backfeed.  We
>lost the repeater the other night when a storm came throught and
>wipe out the commercial power, was out for nearly 8 hours.

So float them across the bus, and be happy!

No switching, no worries.

You do want a supply that is rated at or very close to the repeater
draw, so that long term operation dosen't pull the batteries down,
but that's not a problem. Just dial up the appropriate float voltage
for your batteries.






 
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