ITA Estimated Power summary

[NF-London]

Hi,

In the web client of ITA there is a power summary figure for each location of used/total power.  A user is asking me the source of these figures.  I cannot seem to reconcile these figures with my site figures though.  Sometimes it is almost exactly double the estimated load when totalled from each rack but in other cases it is not.

Mitigating factors:

• These particular sites I am interested in did not have the rack equipment attached to the PDU's in the rack.
• Most if not all the racked equipment is set to DN+1 for power redundancy, where kit has 2 PSU's connected to the 2 PDU's.
• These locations contain racks monitored by intelligent PDU's via DCE (7.6).
• The setting in ITA is set to "Predictive Power" - this has not changed.

		ITA Summary kW	total of peak kW from DCE (30 day measured)	estimated load in ITA web client (each rack EST LOAD totalled)
LOCATION	A	29	11.7	14.63
LOCATION	B	15	7.5	7.72
LOCATION	C	18	10.3	14.46
LOCATION	D	21	34	18.62
LOCATION	E	19	10.7	14.87
LOCATION	F	33	27	30.45
LOCATION	G	197	-	98.5

I need to help the user understand the basis of the summary figures and how they are calculated.

[Jef]

Hi Nigel,

Power kpi’s displayed in the web client is basically the locations UPS power capacity and its utilized power.

In my example the utilized power is 68 kW and the total power is 800 kW:

Kind regards,

Jef

[NF-London]

Yes it is these figures you have highlighted that I want to understand.  Where is the utilised power from?  How is it calculated?

In my table the first column has these summary figures from ITA web client but I cannot understand how they differ between the sites in relation to the 2nd and third columns of measured load and the totals of estimated loads from each rack in ITA.  Surely there must be some consistency?

[Jef · Accepted solution]

Hi Nigel,

The utilized power is the sum of the equipment power consumption (equipment adjusted nameplate value). However, in the power calculations we need also include the equipment redundancy requirement/settings, for example for N+1 or 2N redundancy we need to multiply the power consumption by 2.

Kind regards,

Jef

[NF-London]

Thanks Jef.

I have been experimenting with changing the redundancy on devices installed.  Clearly it makes a difference to the ITA web client summary of utilized power.  I would prefer clearer notes on this as all the documentation I have read only refers to the upstream UPS supply and not the redundancy of the asset itself which is what is being chosen.

Nigel