[Nut-upsuser] Just an interesting data point [CyberPower SNMP]

Phil Stracchino phils at caerllewys.net
Mon Jan 28 02:31:22 GMT 2019

On 1/27/19 9:13 PM, Charles Lepple wrote:
> On Jan 27, 2019, at 2:36 PM, Phil Stracchino <phils at caerllewys.net
> <mailto:phils at caerllewys.net>> wrote:
>> The new Cyberpower PR3000 (also 3KVA), wqhich operates at a 90% power
>> factor, considers this same load to be 43% load.
>> I wasn't expecting that much of a reduction.
> So... 50% load +/- 10% :-)
> (The use of the term "calibration" for an UPS is slightly unfortunate -
> it's certainly not a traceable metrology-style calibration. I would not
> be surprised if most of the passives were 5-10% tolerance, and not
> temperature compensated.)

Oh, I know.  But it should give the UPS a better idea of how long it can
*actually* support that load, and for this purpose that's good enough
for me.

>> In particular, no load, no input or output voltage.  (And the runtime
>> report is not to be trusted yet until I do a calibration run.)
> I forgot that this landed after 2.7.4: 
> https://github.com/networkupstools/nut/pull/632/commits/3f5e3728a720aba0be76b2fccb603b04962bb904
> I forget, is your copy of NUT built from an RPM? If so, it shouldn't be
> too hard to add that patch to get load, charge, input voltage/frequency
> and output voltage (assuming the RM205 is a superset of the RM202).

This is Gentoo Linux so it's built from the latest source version in the

I would tend to make the same assumption about the RM205 vs. the RM202.

> You can also use snmpwalk to see what other values might be available.
> Since there is already a skeleton MIB mapping in NUT, the only two
> things needed are probably the snmpwalk outputs described at the end of
> this
> section: https://networkupstools.org/docs/developer-guide.chunked/ar01s04.html#snmp-subdrivers
>> (Also, I can so far connect only using snmpv1, but I don't know whether
>> I should expect to get any additional data from snmpv3 anyway.)
> Again, not my area of expertise, but as far as NUT is concerned, I think
> the different versions are for authentication methods (SNMPv1 is cleartext).

I actually switched to the usbhid-ups driver, and it is working far
better than the snmp driver did.  I just need a small USB hub now,
because there's only two back-panel USB ports on this server and I now
need three (KVM, GPS receiver, and UPS).

  Phil Stracchino
  Babylon Communications
  phils at caerllewys.net
  phil at co.ordinate.org
  Landline: +1.603.293.8485
  Mobile:   +1.603.998.6958

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