[Nut-upsuser] How to change shutdown notification threshold on Fortron UPS Champs (blazer_usb)?

[Pavel Hofman]

Hi Roger,

Thanks a lot for your hints.

Dne 29. 08. 22 v 15:14 Roger Price napsal(a):
> On Mon, 29 Aug 2022, Pavel Hofman wrote:
> 
> blazer_usb reports:
> 
>>> ups.model: WPHVT2K0
>>> ups.productid: 5161
> 
> The Fortron site 
> https://energy.fsp-europe.com/uninterruptible-power-supply/ has no 
> mention of these references.  I wonder where blazer_usb found them?

It just (auto)magically works :-)
> 
>>> ups.status: OL
> 
> If you unplug the UPS from the wall, and run it down, maybe with a dummy 
> load, do you see OB, LB, other statuses?

Yes, OB -> OL
> 
>>> battery.voltage.high/nominal/low: 52.00/48.0/41.60
> 
> Does the battery.voltage drop regularly as the UPS exhausts itself?

Yes, the voltage drops as the battery discharges.

> 
> If battery.charge.low is not available, perhaps it is possible to get 
> the same effect by watching the voltage drop to a critical value.  This 
> needs upssched and a custom upssched-cmd script.

I see. IIUC since I basically want to "override" the LOWBATT event, not 
to react to it, I will have to periodically parse upsc output and check 
for the current battery.voltage level when OB. It means basically doing 
all the work ups-monitor actually does, but with a different threshold 
(which I do not see how to change in ups-monitor). Do I assume correctly 
I cannot force/script ups-monitor to do that for me since it already has 
all the parsed data available?

Can I at least call some ups-monitor feature to start the controlled 
shutdown on all the NUTS networked clients?

> 
> The alternative is to shutdown after a fixed time in status OB.  Its my 
> preferred solution since I live in an area with a lot of lightning 
> strikes, but few people seem to do it.

Thanks. I do not know the times exactly, checking the battery voltage 
with a standalne script will probably work fine.

Best regards,

Pavel.