Is there such a thing? I have about three Raspberry Pis I’d like to connect to a mini DC UPS so that if the power goes down my Pis can get notified and shut themselves down to prevent file system corruption.
I’ve looked on amazon and ebay and can only see a device with one USB port
any tips?!
What about using a standard UPS to power a usb plug?
yeah, I guess, just seemed big, expensive and noisy for low power use.
Also - has anyone figured out a way to shutdown their Pi based on some kind of signal from the UPS?
The size and therefore the noise of fans for example is based on the power rating of the ups, I would imagine without doing the sums that 3 pi would not require a large ups and therefore probably more looking for the smaller fan less models anyway that don’t make any noise.
Either way the power consumed or in this case required will make no difference if it’s directly powering 3x usb or 3x usb plugs or even 1x 3 port usb plug. The power requirement are going to be roughly speaking the same and therefore completely dictated by how many pi’s you want to power and for how long if the power does go out, not the source of power they are providing.
Raspberry PI UPS does sort of exist: (UPS HAT - Waveshare Wiki) I have no experiance with this.
I have a APC UPS and that one shuts down when there is a very light load on it during an outage. so that woudn’t work for my pi’s
Eric
See
for exactly the same question
You probably have plenty of sensors to detect a power outage on, so just having a UPS in front should be enough, even a large powerbank for a tablet and mobile phone might be enough.
If you really want a sensor device for this only, then you need to make sure you can recieve the signal on the Pis when the power is out.
ESP devices can be run on powerbanks easily and that should be good enough to report a power outage.