[Nut-upsdev] Question about voltage threshold setting in NUT

Charles Lepple clepple at gmail.com
Wed Jun 4 21:48:23 UTC 2014

On Jun 3, 2014, at 5:16 PM, Shen Chuan wrote:

> We have an Eaton 3S 550 UPS using NUT tool to send power loss event. By default the power voltage threshold is set to 85 volts. If the voltage is less than 85 volts, it will trigger ONBATT event from NUT. Is there a way in NUT we can change the threshold from 85 volts to a lower voltage like 40 volts?

It might be possible with upsrw - try modifying "input.transfer.low" and "input.transfer.boost.low".

However, 40V to 110-120V is a long way to boost. Is this UPS rated for such a wide voltage range?

You could also check for sensitivity settings. I don't know about the 3S in particular, but theoretically, usbhid-ups supports those sorts of settings.

Charles Lepple
clepple at gmail

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