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Greenbyte Documentation

Reference Current Normalized

This signal has been specifically created to enable string and combiner box monitoring in Solar sites. The Reference current normalized for a combiner box is calculated based on all the String DC Normalized Current s available in the combiner box.

String monitoring: Given that, it is expected that all strings have similar (or very close) DC Current Normalized; the Reference current can be used in the Alerts to identify situations when the string current deviates beyond an acceptable limit. For example, an alert can be programmed to trigger if IjDCNorm divided by IDCNorm,Reference is less than 80 for more than an hour.

The heatmap now allows plotting the Reference current normalized. Under standard operating conditions, the Reference current for all combiner boxes should be very similar. Hence, any deviation from this behavior can be quickly noticed using a heatmap.

Technology

Solar

Remarks

Needs the initial setup to be completed before it is available on the Platform. For more information, see String DC Normalized Current.

Optional metadata fields:

  • Combiner Box Reference Current (%) (Site metadata 37)

Equation
Reference_Current_Normalized_-_Equation.png

Where:

IDCNorm,Reference

is the Reference current normalized

IjDCNorm

is the Normalized DC currents of the strings in the combiner boxes

P

is the Combiner Box Reference Current (%) (Site metadata 37), a user-defined Percentile threshold. If not defined, a default threshold of 85th Percentile is used.

For more information on Percentiles, see https://en.wikipedia.org/wiki/Percentile.

Inputs
Reference_Current_Normalized_-_Inputs.png
Example

The following example shows how Reference current normalized can be used to monitor combiner boxes.

Reference_Current_Normalized_-_Usage_Example.png