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<div class="moz-cite-prefix">I agree, this is a great idea. Bart
and I discussed it a little the other day. I think our priorities
should be the non-commercial/ham sites that have less reliable
generators and therefore a greater likelihood of extended
downtime. Sites like Bawfaw that have public safety repeaters
have great generator track records and should be at the bottom of
our list, in my opinion. We may even be able to get away with
smaller capacity units at these sites.<br>
<br>
Since we're using an on-line/double conversion UPS, dirty
generator power shouldn't cause a failure. Earlier this year, my
gear at Baldi failed to come back on generator when my [standard]
UPS didn't like the slow 50-something hertz the Wiztronics
generator was producing. An on-line unit shouldn't care, within
reason.<br>
<br>
With the deployment of multiple UPS battery banks now, we should
think about implementing a battery replacement schedule and
budget.<br>
<br>
Dale<br>
AH6ET<br>
<br>
On 2/5/2021 12:41 PM, Bart Kus wrote:<br>
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<blockquote type="cite"
cite="mid:1f6f9985-856f-687a-83bc-f0bf523341c0@bartk.us">
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Hello,<br>
<br>
During the recent wind storm event in January, HamWAN lost utility
power to some sites. This triggered network outages that affected
users and repeaters that relied on those sites. It was far from
our finest hour. "When all else fails", HamWAN should not be the
first in line. I'd like for 2021 to be a year we focus on
reliability. Having a reliable power system at every site seems
like a good place to start that journey. In each of the power
failures in January, a generator system failed to activate. In
these cases, we need at least 24 hours to mount a response in
fixing generators. This means our battery backup systems should
be sized for at least 24 hours of runtime. I have acquired a
couple UPSes that can achieve this. They are composed of the main
UPS:<br>
<br>
<a class="moz-txt-link-freetext"
href="https://www.apc.com/shop/us/en/products/APC-Smart-UPS-XL-Modular-3000VA-120V-Rackmount-Tower/P-SUM3000RMXL2U"
moz-do-not-send="true">https://www.apc.com/shop/us/en/products/APC-Smart-UPS-XL-Modular-3000VA-120V-Rackmount-Tower/P-SUM3000RMXL2U</a><br>
<br>
And one external (and chainable!) battery expansion module:<br>
<br>
<a class="moz-txt-link-freetext"
href="https://www.apc.com/shop/us/en/products/APC-Smart-UPS-XL-Modular-48V-Extended-Run-Battery-Pack/P-SUM48RMXLBP2U"
moz-do-not-send="true">https://www.apc.com/shop/us/en/products/APC-Smart-UPS-XL-Modular-48V-Extended-Run-Battery-Pack/P-SUM48RMXLBP2U</a><br>
<br>
They also feature an AP9631 network interface module in each UPS,
so we can monitor and control the power system. As you can see,
each UPS costs about $3600 new, so the two I acquired would be
$7,200 new. However, I managed to find used units and purchased
brand new batteries for them. <b>The total cost for these two
systems is $963.71.</b> One of them is deployed at Rattlesnake
("Snoqualmie shack") already:<br>
<br>
<a class="moz-txt-link-freetext"
href="https://photos.app.goo.gl/HTomAzJUnrjuJ3bw8"
moz-do-not-send="true">https://photos.app.goo.gl/HTomAzJUnrjuJ3bw8</a><br>
<br>
If we ever want to expand the battery capacity of these, we can
simply plug in more battery modules.<br>
<br>
I'm hoping to deploy the 2nd system in the other building on
Rattlesnake ("DNR shack"), but that hasn't happened yet.<br>
<br>
--Bart<br>
<br>
<br>
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