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I was using a raspberry power supply to power the pi in a setup for 3d printing, a camera and 5" lcd touchscreen run off the pi. I kept getting low voltage warnings so I purchased a 5v 5a power supply and wired it in, setting it's voltage output to 5.3v. I still kept getting low voltage warnings from the pi and the camera would shut off. I wound up turning the power supply output up to 5.7v and am no longer getting low power warnings but I don't want to be running the pi off a voltage that my burn it out. Can anyone tell me the maximum voltage I can supply the pi with? It seems stable at the 5.7v so I don't need to turn it up higher, just want to be sure that it isn't going to damage the pi to supply that much.

Mark Massingill
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"Power" is irrelevant; you should be looking at Voltage.

Almost certainly your power supply or the wiring is inadequate.

See Raspberry Pi Power Limitations

The Pi specification states power sources SHOULD provide 5±0.25V.
The MxL7704 PMIC Data states Input voltage range: 4.0V to 5.5V.

You risk blowing up your Pi, although most components will allow some parameters to be exceeded. I (as an experienced engineer) choose to follow specifications, unless there is a good reason.

Milliways
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The issue with Switching Power Supply is: it TRIES to keep the voltage on the same level but as someone mentioned already - if you have a drop to 4.5V even for millisecond the Pi will detect it. I spent recently wast amount of time on RPi power supply as I was building UPS on supercaps and my findings are:

  • the best place to measure the voltage on Pi are the 5V pins and the ground - not the input of the USB port
  • 5.7V for RPi 4 is not an issue as long as it does not go even for microseconds above it - but I set up to have max 5.5V on PINs
  • when you have heavy load turning on, for the milliseconds you might have drop which ORDINARY voltmeter will not detect - oscilloscope could but it is a bit of overkill
  • I would suggest powering (if possible) external devices from external PS - not through RPi - separate power to RPi and camera but get another PS for i.e. USB devices
Zygfryd Homonto
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