Good Morning, I am working on setting up a 12V DC UPS that will power a NAS and a router for a few hours. It contains some lithium-ion batteries, and a BMS to control charging. Since it is just a dumb box with batteries, it has no intelligence to inform the NAS of its status. This is where NUT comes in...
I would like to incorporate a Raspberry Pi NUT server into this scheme. The Rpi can measure input voltage, and output voltage & current to determine the status of this simple UPS. With some of the excellent documentation online, I have gotten a NUT server running on the Rpi, and my NAS (a Qnap) has been able to read the status. I used the 'dummy-ups' driver for testing this and it worked great. Now, for the real business - Since this is entirely homebrew, there is not an appropriate driver available. I read about creating my own driver using 'skel.c' as a template. But, nobody else would have any interest in my very specialized driver. Plus - it seems overwhelming to me when I attempt to understand how to build NUT and I fear getting totally bogged down in all the minutiae of that. But, it occurred to me - Why can't I just use 'dummy-ups' for this as-is? I can have a simple 'c' or Python program to read my values (to determine status) and then just write a few relevant lines into a '.dev' file to be served out to the LAN with the factory NUT server tools? My file would contain something like this: ups.mfr: Tom ups.model: My Contraption battery.charge: 100 ups.status: OL input.voltage: 1.02 battery.voltage: 11.5 output.voltage: 11.2 output.current: 3.4 battery.runtime: 1000 I write this file periodically (maybe every 15-60 seconds) and the Rpi NUT server would be none the wiser and just keep supplying the constantly updated contents of this file to the NAS. Am I overlooking something with this approach? I am completely new to NUT and would appreciate any feedback from more seasoned users... -Thanks Tom
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