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My company recently ran tests on two Pi 4Bs in a temp chamber with camera attached.

Ran 1000 hours at 70C ambient - CPU around 80-82C No issues. (power always on)

Ran 1000 hours hot/cold cycle -25C to +60C - 8 hour cycle, 4 cold, 4 hot. No issues. (power always on)

Then we tried cold start at -25C, -15C, -10C temps.

Temp chamber soak at these temps for 1 hour, Pi powered off then switched on.

Seeing Ethernet failure and slow boot times at -15C and below. Likely due to Ethernet/USB controller chip ( 0C - 70C rated) When Pi is powered on, say at 0C and then cooled down (with power) works OK at these temps - maybe self-heating from chip keeps it going?

We don't think that condensation on RJ45 Ethernet or SD card contacts may cause this - need to investigate.

Power adapter is also inside chamber - maybe that is weak link?

Anybody else have experience with cold start up of a Pi board?

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  • 1
    unsuitable fot raspberry pi SE.
    – Dirk
    Jan 27 at 3:52
  • IIRC this is outside the operating temp of the PI. Jan 27 at 15:30

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