[SOLVED] Planning an XU4 project for outdoor usage (converter 12v / 5v 10A)

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domih
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[SOLVED] Planning an XU4 project for outdoor usage (converter 12v / 5v 10A)

Unread post by domih » Mon Jan 27, 2020 11:53 am

I would use an XU4 powered by a 12v battery through a converter.

See for example this converter: https://www.amazon.com/product-reviews/B01M03288J

Several users report the converter delivers ~5.2 volt. Is this OK? or is the XU4 quite sensible to ~4% over-voltage?
Last edited by domih on Sat Feb 01, 2020 10:39 am, edited 1 time in total.

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mad_ady
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Re: Planning an XU4 project for outdoor usage (converter 12v / 5v 10A)

Unread post by mad_ady » Mon Jan 27, 2020 1:37 pm

5.2V should be fine. Problem is most likely that 5.2V is measured without load. At full load (xu4+vu7) it may drop below 4.8V and might affect board stability. So check it under load to make sure it's stable.
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domih (Fri Jan 31, 2020 3:46 pm)

o_lampe
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Re: Planning an XU4 project for outdoor usage (converter 12v / 5v 10A)

Unread post by o_lampe » Mon Jan 27, 2020 4:20 pm

AFAIK , the XU4 SoC doesn't 'see' 5.2V directly. It's the buck-converter and the USB devices which have to cope with the overvoltage. I think it's no big deal.
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domih (Fri Jan 31, 2020 3:46 pm)

domih
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[SOLVED] Planning an XU4 project for outdoor usage (converter 12v / 5v 10A)

Unread post by domih » Fri Jan 31, 2020 3:42 pm

I received the EPBOWPT DC 12/24V to 5V 10A Converter. Looks like working OK.

So far: XU4 + wired KB + wireless mouse + USB 3 hub + USB 2 hub + USB Tester + Odroid Wifi dongle + VU 7A Plus + USB GPS receiver do not draw that many amps.

For now using a small Duracell 12V 8Ah AGM (DURA12-8F2).

When plugged in the wall, the system draw 5W idle and up to 11W when booting or "doing" things.

When on battery the USB 2 port (USB Tester + VU 7A Plus + USB GPS Receiver) shows 5.02V and drawing 75 mA.

Got gpsmon /dev/ttyACM0 and foxtrotgps to work and show correct data. The USB GPS receiver seems to be a little bit temperamental. On battery or plugged to the wall, the device /dev/ttyACM0 can't be created or returns read error and then it ends up working AOK after a cold reboot. I'm still looking at the logs plus online search to get a workaround.
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odroid (Fri Jan 31, 2020 5:02 pm)

domih
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Re: [SOLVED] Planning an XU4 project for outdoor usage (converter 12v / 5v 10A)

Unread post by domih » Sat Feb 01, 2020 10:48 am

Following experiments while plugged in to the wall, adding/removing an USB3/SATA/SSD and adding/removing the USB3 hub had an evident effect on the stability of the USB GPS receiver, I could see the USB2 voltage going down to 4.9V from time to time. After removing the non-necessary stuff for testing, the USB GPS receiver behaved much better. My empirical conclusion is that the board 5V delivery to the USB2 and USB3 might be taxed too much. I'm going to test further with powered USB hubs with the 5V delivery to the hubs coming directly from the 12V battery/converter in order to relieve the board.
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odroid (Mon Feb 03, 2020 10:25 am)

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