In this article:
Overview
This calculation detects flatlines on 
in PV sites and is a required input for the Reduced AC Capacity Smart Event. The calculation runs once overnight on all inverters of a given site, and requires “day of” historical data.
Calculation logic
Given a data frame or series of
calculate 
for every interval.Look at a rolling window of
intervals and calculate the max for each window.If the value is less than
, mark as flatline.If flatlined, all intervals within the window are marked as flatlined (i.e. propagated backwards).
Calculation does not run for intervals where sun height is below
Inputs
Signals
| Segment Apcode | Mloc Apcode | CalcType | CalcPeriod | MType | Notes |
| Inverter | ActivePower | Final | SiteTR | Power | |
| Site | SunHeightAngle | Calculated | SiteTR | Angle |
Configuration Parameters
Parameter | Value | Notes |
|---|---|---|
DEFAULT_WINDOW | 4 | min number of intervals that must be flatlined to be marked as flatlined |
DEFAULT_DIFF_THRESHOLD | 1 | max interval-by-interval difference in |
MIN_SUN_HEIGHT | 10 | only mark flatlines above min sun height |
Outputs
Signals
| SegmentApcode | Mloc Apcode | CalcType | CalcPeriod | MType | Unit | Notes |
Inverter | ActivePowerFlatlineFlag | Calculated | siteTR | Flag | - |
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