[arm-allstar] UPS Suggestions...

[Jesse Royall]

Sean, 
Yes it will restart when power is applied and will start charging again. If you do a shutdown then no. You have to remove power and apply it to start back up. But it will start up if the batteries go dead and power comes back on. It has a smart charge built on. You setup a python script to monitor the voltage and it will initiate a safe power down before they go dead. Then when they go dead it will restart the pi when power is applied back to charge the batteries. What sold me is that one power supply to power the ups then since it’s a hat, it supplies the pi with power on the header. If the cells go bad you just replace them like AA batteries. You can replace them one at a time without loosing power. You can also stack them to increase the battery time and they have connections to daisy  them and charge the next ups. Has a reset button on board to force a restart when pressed. The only problem I’ve had is I had one bad cell once and it would take the other cell down with it. But the voltage monitor would catch it and shut down the pi when unplugged it. The other is when picking up the pi, I had a habit of hitting the reset accidentally. 

I’m was working on a script to watch the voltage and when it sees a voltage drop it tells you via courtesy tone your on battery and possibly speak voltage at intervals. Since the cron job looks for low voltage to safe power down I figure I could use that check to report back to allstar and either tattle via tone or voice. 


Sent from my iPhone

> On Jun 28, 2018, at 10:11 AM, Sean McCarthy via arm-allstar <arm-allstar at hamvoip.org> wrote:
> 
> I was looking at the pi uptime ups, but it was unclear if it would restart
> the PI unattended. If it does, thats probably the way I'll go...
> 
> On Thu, Jun 28, 2018 at 10:26 AM "Jesse Royall via arm-allstar" <
> arm-allstar at hamvoip.org> wrote:
> 
>> http://alchemy-power.com/pi-uptime-ups/
>> 
>> This is the one I use. Uses 2 18650 batteries. I get about 10 hrs of
>> backup. It’s stackable. Has a reset button on it. Monitors the voltage for
>> a safe power off. And boots back up when power is applied.
>> 
>> Sent from my iPhone
>> 
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