[HamWAN PSDR] VOTE: Power backup expansion project

[Kenny Richards]

Bart,

Are there options for sites where we don't have access to that much rack /
physical space? (obviously with reduced runtime)

Which set of sites would be targeted? I'm guessing SnoDEM, CapitolPark and
Beacon might not need the same level of backup as Baldi, Rattlesnake,
Capital Peak, etc.

Thanks
Kenny




On Fri, Feb 5, 2021 at 12:41 PM Bart Kus <me at bartk.us> wrote:

> Hello,
>
> 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:
>
>
> https://www.apc.com/shop/us/en/products/APC-Smart-UPS-XL-Modular-3000VA-120V-Rackmount-Tower/P-SUM3000RMXL2U
>
> And one external (and chainable!) battery expansion module:
>
>
> https://www.apc.com/shop/us/en/products/APC-Smart-UPS-XL-Modular-48V-Extended-Run-Battery-Pack/P-SUM48RMXLBP2U
>
> 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.  *The
> total cost for these two systems is $963.71.*  One of them is deployed at
> Rattlesnake ("Snoqualmie shack") already:
>
> https://photos.app.goo.gl/HTomAzJUnrjuJ3bw8
>
> If we ever want to expand the battery capacity of these, we can simply
> plug in more battery modules.
>
> I'm hoping to deploy the 2nd system in the other building on Rattlesnake
> ("DNR shack"), but that hasn't happened yet.
>
> --Bart
>
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