drgeoff wrote: ↑
Wed Nov 26, 2014 4:25 pm
Is the power outage just a quick blip or sustained for some tens of seconds? If the outage is short there will be some power stored in the PSU that will slowly die away and cause the voltage received by the RPi to fade. This can cause the RPi to enter a mode where it isn't "off" but does does not work properly (eg it appears to freeze or "hang"). When full power is restored the RPi doesn't leave that state.
I suspect that this was what we experienced with our Pi last week. Is there anything that can be done to prevent this state of non-existence?
The site is quite remote, so going up there to pull the power plug and restore it again is not really an option.
Sounds like the Pi might be better off not running off a backup battery, and just suffer the immediate power cut, which will then at least cause it to reboot when power is restored.