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Re: Pi 5 portable power

 

my research says that a QC and PD port has to negotiate to get higher power.? Can a Pi 5 do that???I don't think so.



"Quick Charge requires both the power supply and the device being charged to support it, otherwise charging falls back to the standard USB ten watts."



I'll let someone else decipher that page but my take on it is that it is 3A (15 watts) unless it able to?negotiate to get higher power.

So it would seem it would be better to use one of the PD ports and get?3A (15 watts)?versus the QC port and only get 10 watts.

Please correct me if I'm wrong.

Max KG4PID


On Thursday, March 7, 2024, 07:19:49 PM CST, Tom Hyde NK5H <nk5h.tx@...> wrote:

Ken,

Any USB-C standard power outlet will have the standard 5V, 9V, and 12V pins, you just need one rated at 28W or higher. Your 30W unit will work fine.?

Tom NK5H?

On Thu, Mar 7, 2024 at 12:18 Kenneth R. van Wyk <ken@...> wrote:
I’m running a Pi 5 here, with pretty good successes. It is my intention to build it into a portable PC for radio operations (e.g., POTA, vacations).

One concern I had was regarding power when I’m away from 120V AC. I know it’s been discussed here a lot that we have to use the official Pi 28 Watt charger and such.

HOWEVER, I have a LiFePo4 + solar battery system I built. I included in it a socket with 2 USB-C PD ports rated at 30 Watts each. (I use it to charge my MacBook Pro often.)

I just booted up my Pi 5 on that port and got no warnings about low voltages at all. It just runs. I see no difference between this and the factory power adapter.

I’m not running anything on the USB ports, so the power draw isn’t that much anyway. My configuration is Pi 5 with 8 Gb, Pi OS, Pimoroni NVMe Base board with an NVMe (Sabrent) 1 TB boot drive.

I’ll report back if I encounter any problems, but so far so good.

The socket I put in my LiFePo4 box is this one from Amazon ($20.99):




73 de K0RvW
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