[HiDARG-MEMBERS] Repeater Battery Protection Systems

[Max Vaughan]

In light of the loss of batteries on Glass (due to a breaker blowing) and
taking the batteries below recovery voltage
and the fact that we believe the batteries at Mt Stephenson have suffered
the same fate, I have been researching 
devices and systems, that will toggle off the radio load connected to any
battery system, if the voltage drops below a certain level it basically
turns the radios off.
I also wanted a system that would trigger some type of alarm, etc.

In doing research for the last year or so, I have seen all kinds of do it
your self setups, complicated devices and inexpensive and very expensive
ones.
All had good points, bad points and reviews going both directions. 
Building our own seemed to be a good choice, but I have enough projects to
last me longer than I can walk this planet.
I had weeded out the chaff and settled on a couple of ones that would do the
job and started comparing the features.
Most were of China origin, all had mixed reviews, 

In researching new AGM batteries for Mt Stephenson I stumbled across this
one.
These do not have a real complicated setup, did not have more features than
what was required at our sites.
I was so impressed, (easy to do) I ordered 8 of them, 1 for each site and
two spares.

I am currently running tests with one, with the new MT-S batteries and the
link radio on our spare repeater system.
The Kenwood TK-8180  draws .250 amp in standby mode.
So far so good.....but sure taking a long time for the voltage to drop been
running most of today (Sun), maybe next week. HI

The circuit being used is the one in Fig-2. Note that this system can be
used to trigger a relay, light or alarm system.
I have also included the setup and instructions sheet for those that want
more detail on how they are used and the specs.

I will be bringing one into lunch with me on Wed for those of you who want
to check it out.
The run a bit over $58 dollars apiece, and can handle up to 100amps of full
load current.

They do not have a voltage drop across them from the input to the load,
unlike most of the others I ran into.
At least I was not able to determine if there was one.
And they are manufactured in the Netherlands.....

If you have backup batteries or thinking of putting in a system.... 
I have a feeling these will definitely be worth a look.

Please email me direct maxv at horizonps.com if you want more information.

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73
Max Vaughan KF7MAX  Secretary
High Desert Amateur Radio Group
PO Box 723
Bend, Oregon USA   97709 
www.hidarg.org  
maxv at horizonps.com       kf7max at arrl.net 
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