[Nut-upsuser] Can't get CyberPower UPS to work with Raspberry Pi 4

[Charles Lepple]

On Oct 26, 2020, at 9:38 AM, Gene Heskett <gheskett at shentel.net> wrote:
> 
>>> battery.voltage: 24.0
>>> battery.voltage.nominal: 24
>> 
>> I don't have the citation handy, but I think another user reported
>> that the battery.voltage returned by the UPS is a constant 24.0 V,
>> regardless of the actual battery voltage.
[...]
> I think it may be dependent on thhe ups. I have a 625 WA cyberpower on an 
> rpi4, and I believe its more truthfull. Is this helpfull?
> 
You're right, the lack of a battery voltage sensor isn't true for all CPS hardware.

I was trying to make the point that the 24.0 V reading is suspect, while covering the cases where broken scaling means that NUT displays it as 16.0 V.

However, back in January, we discussed the input.transfer.high/.low issue: https://alioth-lists.debian.net/pipermail/nut-upsuser/2020-January/011668.html

The root cause of that is closer to some of the other CPS issues, like the "output.voltage: 137.0" that Robert posted.

That upsc dump is useful. For completeness, could you (and Robert) please post the output of "upsrw myups" and "upscmd -l myups"?

I manually grep through upsc output to find these sorts of things, but some day, I'd like the DDL[*] to be able to show a table of UPS models and their supported NUT variables. (Something like a hardware comparison on a vendor website, but from the perspective of what NUT can read.)

[*] e.g. https://networkupstools.org/ddl/Cyber_Power_Systems/