I just got my hands on an UPS.
They were surplus at work, and I got it very very cheap.
Its a Coromatic Blazer Vista 2000.
It seems to be working OK, allthough I suspect the batteries are somewhat out of shape. Its been sitting in the warehouse for some years.
I have tested it on my everyday PC, and it keeps it allive when I pull the power, and after some time it even initiated that the PC shutdown, because of low battery, and the PC safely shut down. So that was encouraging.
I have installed it on my Rockstor system, with the recommended settings, and using the blazer_usb driver.
Activated the NUT-UPS service, and it seems to work. At least the button stays activated.
Is there any way to check any parameters to see if it is actually working?
Read out battery status and so on?