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Hi everyone, I need advice on how to power the Raspberry Pi 5 in the car, the Raspberry Pi 4 that is currently in the car is powered via a USB Type-C port and a step-down, the Pi 5 instead, to start up, if I read correctly, checks the power delivery, in fact if I try on the bench with a professional power supply that supplies 5.15V and certainly more than 5A it does not start, how did you solve the problem? Thanks for the suggestions

It is probably related to usb_max_current_enable

Differences on Raspberry Pi 5

USB boot is disabled by default when connected to a 3A power supply. Set usb_max_current_enable=1 in /boot/firmware/config.txt to enable USB boot. Alternatively, you can press the power button a single time on a failed USB boot to temporarily enable usb_max_current_enable and continue booting. However, this setting will not persist after a reboot if enabled by pressing the power button.

https://www.raspberrypi.com/documentati ... berry-pi-5

I found and tested this bulk converter from AliExpress and it works with Pi5 with 1600x600 wide screen, plug in phone for AA without low voltage warning. It has enabling pin to turn on and off the power. I connect the power into USBC with a USB C connector.

I just found this on AliExpress:
MYR46.91 | DC-DC Step-down Converter Module 9/12/24V To 5V16A/12V12A Power Supply Module Buck Power Supply Converter Module PCB Board
https://a.aliexpress.com/_c30ZMxIT

Hi, I purchased this product
https://wiki.52pi.com/index.php?title=EP-0225
It should arrive in a few days. It's a bit expensive, but I've read positive reviews.

I've been using it for over a month, it works great, no low voltage issues, money well spent

I grabbed this from amazon:

https://www.amazon.com/dp/B07XXWQ49N?re ... asin_title

They put out 5.25V @ 5A from 12+V and can run with typical running car voltage (~14.5V). They don't even get terribly warm.

This module was cool:
https://www.mausberrycircuits.com/produ ... ply-switch.

Any other idea to switch off automaticly the Pi?

I'm using one of these. 5v 20a buck converter. Works well so far:
https://www.dfrobot.com/product-2662.html

Hiphouser wrote: Fri Nov 28, 2025 12:33 am This module was cool:
https://www.mausberrycircuits.com/produ ... ply-switch.

Any other idea to switch off automaticly the Pi?

You can use an optocouple to sense the acc line (~12v) from the car and set a gpio pin high/low to trigger a shutdown. I'm using one of these: https://www.amazon.com/dp/B0B5373L4P

Nice!
Di you have a script exemple to use that?

Using a CarPiHat Pro wired off fuse taps and it works great for me. Tried a few different solutions before arriving at this one.