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Power dock turning off after 30 minutes

  • Interestingly, I've found if the power dock has a battery plugged into it it stays powered up. So far for three days which is a record.

    I wonder if without something to charge the power dock is producing fluctuating voltages which is causing the onion to power off?

    Does anyone know how this could be tested exactly?

  • @Julien-D Same issue here, wrote a program that times it for me at 50 minutes every time. Powering from a PC usb or a 5V 550mA power supply. However I was just reading modes of the power dock and when my unit is plugged into a PC USB port with no battery attached, the low battery warning LED is flashing instead of stationary mode where the LEDs should be flashing erratically.

  • @Lucien-Jamieson It's interesting that it's 50 minutes each time for you... I'd imagine your PC USB port can't provide enough amps, hence the warning?
    I'd also guess that the Expansion dock pulls less amps so just swapping for one of those wouldn't be a fair test, but if it did show the same warning it'd be tell tale that PC USB isn't outputting enough.
    I'm using 1amp minimum chargers for my Onions.

  • administrators

    @Niels-Christensen @Julien-D @Lucien-Jamieson
    Can you give a bit more details about the situation? Am I correct in assuming that you're using the Power Dock with no battery (stationary mode) when it exhibits this behaviour? (See the Power Dock modes in our documentation)

    When it does turn off, is it just the Omega that turns off or is it the Dock as well?
    Is the Power Dock's power LED still on?

  • @Lazar-Demin said in Power dock turning off after 30 minutes:

    Power Dock modes

    Hi Lazar,
    Thanks for getting involved, I'm not sure I can speak for everyone, but for me it appears to only be a problem when in stationary mode. The power dock stays on and the Onion dies after a while (orange led off and not responding to pings).


  • administrators

    @Niels-Christensen Ok, thanks for the info, that's really helpful. We'll be investigating this and will have an official response by the end of the month.

  • I had a similar problem with the mini dock, using a 500ma left over wall wart. I've tried two Omega2+s. I next switched to a 2A unit (left over Kindle charger) and it's been running 4 days (so far, fingers crossed).

    From the specs, 500mA should have been enough, but ...

  • @Burton-Strauss I've got a few 1A and 2A chargers, and they're both showing the same problem with the x2 power docks I have.

  • @Lazar-Demin Thanks Lazar, I've since noticed after a round of casual testing last night that when using a 1A USB charger, one of the power dock turns off too (all LEDs off).
    It may be the dock or the charger in this particular test so I'll do some more testing this week with a different known good 2A charger I use for my Pi server (always on).

  • @Lazar-Demin For myself, I am running a power dock in stationary mode with no battery connected, however the LED is flashing low battery warning (not erratically). I have tried a 2A wall wart with the same results. The power dock and Omega, all LED's turn off.

  • administrators

    Hmmm, I've had a Power Dock plugged in for about 2 hours in stationary mode (no battery, short USB cable) with the lights flashing erratically with no reboots.

    Fri Aug 18 20:54:00 EDT 2017    20:54:00 up  1:48,  load average: 0.00, 0.00, 0.00  

    I'll try leaving it over the weekend and seeing what happens. Will report back monday/tuesday.

  • administrators

    An update from my end:

    • I've left two Power Docks in stationary mode (connected to power via micro USB port and no battery) since Friday
    • One has the LEDs flashing erratically, the other has the LEDs looking like it's charging a battery (for whatever reason)

    I made a cron job to track the uptime in a file, this is my latest reading:

    root@Omega-7CCB:~# uptime
     14:22:26 up 3 days, 13:54,  load average: 0.00, 0.00, 0.00

    They both rebooted in the middle of the night on Saturday at the exact same time. Which leads me to believe that the office or my USB hub might have momentarily lost power.

    In any case, I haven't been able to reproduce your issue.

    I do, however, have a suggestion!

    Try configuring the cron daemon to run the power-dock command once every 10 or 20 minutes.

    Install the power-dock package:

    opkg update
    opkg install power-dock

    Open the crontab editor

    crontab -e


    */20 * * * * /usr/bin/power-dock 

    Save and exit, then restart the cron daemon:

    /etc/init.d/cron restart

    My suspicion here is that the Battery Management chip is not detecting enough current draw from the Omega and deciding that it should just shut down to conserve power. By running the power-dock command every once in a while, you give the chip an indication that it needs to stay powered on!

    Try it out and please let me know how it goes!

  • @Lazar-Demin How did you get on? As you can imagine this isn't confidence inspiring behaviour from the little critters.

    In a strange turn of events leaving the device turned on without it's usual relay board attached has seen uptime of a few days now. Is this the culprit or is it just luck?

  • administrators

  • @Lazar-Demin Oh haha, I guess I hadn't refreshed my page. Thanks I'll give that a go šŸ™‚

  • Have been looking at this on and off for the last month. I'm still finding that my x2 Omega2+'s are turning off after a random timeframe when connected to a power dock.

    Similarly when connected to a expansion dock, the onion stays on indefinitely.

    @Lazar-Demin Did you look into this further?

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