I've got a Banana Pi M1 running 24/7 inside a ventilated enclosure in a vertical position (I read that this was better than horizontal), but am a little concerned if the PMU temperature readings are to be believed.|
I've read through the various posts such as this one with regards to getting the temperature readings and their accuracy etc, but in every example I've come across, the CPU has always been the hottest, and temperatures have been fairly low in general.
I have not got any heatsinks or active cooling, but the case does have ventilation holes as I mentioned, and both the CPU and HDD temperature seem fine compared to the PMU.
The Pi is powered via 5v to the HDD power port, not the micro USB, and the connected HDD is also powered by this same 5v source, so not relying on the Pi. It is running OpenMediaVault acting purely as a networked storage device, and has small amounts of data written to it a few times an hour.
As you can see from the above image, the PMU temperature seems to be alarmingly high when you consider the lack of load on the Pi, and the small ~200mA current draw.
PMU Temp Graph
In the graph above you can see that the temperature decreases over night when it is cooler, and then increases again during the day, however even the lowest temperature reading of ~45 seems to be far too high.
Am I right in thinking that the Banana Pi will shutdown automatically if the PMU reaches a certain temperature? If so, at what temperature?
Does anyone have any thoughts on what could be the cause of this high temperature reading? Perhaps the sensor could be faulty and it isn't actually that hot? Or maybe the actual AXP209 is faulty?
Any advice would be greatly appreciated.