[App_rpt-users] USB Battery Bank that supports 'Pass Through Charging' and acts as a UPS for Allstar Nodes running on a Pi

Mark Phillips g7ltt at g7ltt.com
Wed Jul 12 11:51:02 EDT 2017

This thread has been useful for some other projects I have going at the
moment. I think the "proper" way to do this is to power the Pi from a 12V
source and a buck converter. There are any number of 12V pwrgate doo-dads
that you could make to handle the UPS side. I found this on Thingiverse
that is not only a Pi case but also has a buck convertor too ....

I think this is the way I'm going to go for my node rebuild. I'm going to
do this Pi setup and one of these
http://www.repeater-builder.com/products/usb-rim-lite.html for a spare
Motorola SM50 down at the farm. It'll be solar powered with a WiFi
connection back to the office. The whole lot will be mounted on some 3/4
plywood on the barn wall. I'm building one of those 18650 Tesla type
battery packs to store the power. Should get about a week of run time just
on the batteries.

Hello, Ramesh. Sorry I've been out of touch lately. I moved to Delaware 2
years ago after the wife threw me out. Been busy getting divorced and all
that goes with that. Good news is that I have sole custody of my kids now
and that things are starting to level out.

On Mon, Jul 10, 2017 at 3:56 PM, Ramesh Dhami <Ramesh at va3uv.com> wrote:

> On 2017-07-10 1:03 PM, Carl wrote:
>> I have not used the buck converter linked below, but I have tried using a
>> different buck converter to go from 12V to 5V for the Pi, and found it
>> introduced an excessive amount of noise into the Pi (which carried over
>> into the radio audio). Something to check as you develop your power scheme.
>> Carl
>> <-- Hi Carl:  Absolutely, I have some of those converters from "CPT" and
> just as you describe, I found them to induce noise into the Pi / fob, which
> then get into the audio stream.  Not good!
> My original plan was to use the Battery Bank (dual USB output) to power
> both the Pi and my Baofeng BF888s... but, in doing so, I get a humm on the
> TX audio out of the Baofeng.  When I move the Baofeng's over to a separate
> wallwart / USB charger, the noise goes away.
> To Mark's question (Gee, where did you crawl out from? ;) keeping the Pi
> up during a power blip, etc., eliminates the need for someone to go to site
> to recycle power to the Pi.  Everything else, losing power, isn't such a
> big issue... just trying to keep the Pi somewhat immune to power blips.
> Cheers!
> Ramesh.
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