This question was originally posted on DCIM Support by Shaik Mahboob Ali on 2017-05-24
Hi Any one can support me for Virtual sensor wrong value issue in DCE i am facing.Below is my work out
I fetch independent 32 system sensor total utilization and calculated on excel getting total as 2978.235 kilo watts.
I have created a new virtual sensor--> Total–> Power with all 32 system sensor total but is showing wrong value as 2676.1 kilo watts
Can any one let me know what went wrong.
This comment was originally posted on DCIM Support by spezialist on 2017-05-24
Hi Shaik Mahboob Ali,
Can you provide a screenshot similar to mine?
This would greatly simplify the task of solving your problem.
This comment was originally posted on DCIM Support by Shaik Mahboob Ali on 2017-05-24
Hi I have attach the current readings PIC and it is giving me difference of 40.07 KW but when i pull the virtual sensor report for the period of 3 days the sensor value is way different i.e. wrong to more then 100 + KW but when i do calculation by fetching independent sensor then value is correct.
This answer was originally posted on DCIM Support by spezialist on 2017-05-24
Hi Shaik Mahboob Ali,
The reason for the inaccuracy is mathematical rounding.
You have 38 power meters that have real power sensors with an accuracy of 1W. A DCE-server total power virtual sensor "measures" the real power in kW with an accuracy of 100W (a hundred times worse). After simple mathematical calculations we get your difference in readings of about 40kW. I.e., mathematically, the DCE-server calculates everything correctly.
If at a real total power of more than 2MW this inaccuracy is unacceptable for you, then for a total power virtual sensor it is necessary to use power meter device sensors not in kW, but in W. Since the DCE-server total power virtual sensor in W has an accuracy of 100mW (or that is the same 0.1W).
If your power meters do not have such sensors (in W), they can easily be created by making small changes to the DDF-files of the power meters. This is the practical solution to your problem.
Always glad to help.
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