Configuring Performance Ratio

The Performance Ratio process is used to produce a daily energy estimate for devices in a Workgroup. It is currently built to process solar irradiation data, typically sourced from a satellite irradiation monitoring service. If you would like to enable this

Prerequisites

To configure the performance ratio process, you will need appropriate permissions on the Workgroup: either the Owner role, or the "Manage Searches & Dashboards" permission.

You will also need device & source level metadata items defined & set on all devices that you want to be processed by performance ratio.

Irradiation

Set these values to source-level metadata items that store appropriate values.

Azimuth: stores the Azimuth of the source, in degrees. Set the Zero Direction to match the zero direction of your Azimuth metadata item. If multiple Azimuths apply to a source, this metadata item can contain a comma-separated list of Azimuths. There is also an option to specify a specific fraction for each azimuth if the ratio of panels is not even.

azimuthDef=[<fraction>:]<azimuth>
azimuthExpr=<azimuthDef>[,<azimuthDef>...]

Elevation: defines the elevation of the source, in meters.

Slope: defines the tilt of solar panels, in degrees. If groups of panels have different slopes, this metadata item can contain a list of values. There is also an option to specify a specific fraction for each slope if the ratio of panels is not even. Further still, this can be broken down per azimuth.

slopeDef=[<fraction>:]<slope>
slopeExpr=<slopeDef>[,<slopeDef>...]
<azimuth>{<slopeExpr>}[,<azimuth>{<slopeExpr>}]

Latitude / Longitude: latitude & longitude of the source, in degrees

Energy

Timezone: this should align with the timezone set in the Daily Energy configuration.

Total Panel Area: set this to a device-level metadata item that stores the total solar panel area at the plant in square meters.

Panels per Source: set this to a source-level metadata item that defines the number of panels linked to the source.

Panel Efficiency: device-level metadata item that defines an efficiency coefficient for panels at a plant. This number must be a fraction (e.g. 0.13) not a percent.

Coefficient of Loss: device-level metadata item defining the coefficient of loss for panels at the plant. This number must be a fraction (e.g. 0.9) not a percent. Default is 0.9.

Temperature Coefficient: Optional device-level coefficient defining the impact of change in temperature on maximum inverter power

Panel Degradation

Start of operation: device-level metadata item that defines the date the plant went into operation. Use the Start of operation date format field to define the date format of your metadata item.

Annual panel degradation: device-level metadata item that defines the annual panel degradation coefficient.