Power Pijuice Hat with 12V or POE ?

[OhSoGood]

Hi,

I wonder how to power the Pijuice Hat with 12V and/or with POE (802.3at/af). @shawaj, I saw you mentioned that some people have already done it, I asked @ryanteck but he kindly told me he is no more on that subject. In our project, we have 100 Pijuice in preparation or live. Each box uses a POE splitter to receive power by Ethernet cable and to convert the POE voltage to 5V, and is then connected by USB to the Pijuice. I wonder if this double conversion, in POE splitter then in the Pijuice, could not be more efficient.

How could we connect POE and/or 12V to the Pijuice, e.g. to J4, would you have small and cheap component to suggest (we are both limited in size and cost in that project) ? Is the 10V limit strict or is there some tolerance?

Thank you for your suggestions!

[OhSoGood]

@shawaj , any reaction on this? Anybody?

[tvoverbeek]

In the datasheet for the charging chip the max input voltage is specified at 18V. However the operational input voltage is specified as between 4 and 10V. So it seems 12V will not damage the chip, but I do not know if the delivered 3.3V output (used e.g. to power the MCU) will also be higher and then damage things downstream.

[OhSoGood]

Thank you very much, Ton, to take the time to have a look at the datasheet. Would you have a link to it?

If someone from Pi-Supply could give an official view on it... (if I'm not wrong, Ton, you aren't working for them, are you?)

Le 01/06/2022 à 14:23, Ton van Overbeek a écrit :

In the datasheet for the charging chip the max input voltage is specified at 18V. However the operational input voltage is specified as between 4 and 10V. So it seems 12V will not damage the chip, but I do not know if the delivered 3.3V output (used e.g. to power the MCU) will also be higher and then damage things downstream.

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[tvoverbeek]

Datasheet is on github: https://github.com/PiSupply/PiJuice/blob/master/Hardware/Datasheets/BQ24160RGET.pdf See also the PiJuice schematic: https://github.com/PiSupply/PiJuice/blob/master/Documentation/PiJuice_Schematic.PDF You are right, I am not working for Nebra/Pi-Supply, just a volunteer.

[JolleJolles]

I hope it is okay I join in on the discussion here, as I am also trying to connect a 12V power source to the pijuice. The difference is though that I want to use a 12V solar panel. Is this possible? Or possible with buck converter? And is it best to connect to the J4? Or should I use a 12V>5V usb converter? Many thanks

[marcsauter75]

I am also interested to user pijuice with 12-14V - is this possible ?