All data in the Proximal platform is inherently uncertain. This is due to the fact that sensors have inherent uncertainty and models have uncertainty on top of that. The following tables are a reference for users to use in order to understand the data and models being reported by the platform.
By default all reported values below are:
95% Uncertainty (Expanded) (U)
Sensor Measurement Uncertainty Reference
Class A Pyranometer ±2% (daily total absolute) 1 Class A Pyranometer ±3% (hourly total absolute) 1
Sensor Measurement Uncertainty Reference
Optical ±4-7% (relative) 2 Cell-Cell ±4-7% (relative) 2 Cell-Module (power) ±1-2% (relative) 2 Cell-Module (current) ±3-5% (relative) 2 Module-Module ±4-7% (relative) 2 Cell-Cell ±4-7% (relative) 2
Optical sensors may not capture the IAM effects of soiling
Cell-Cell sensors will not capture the effects of non-uniform soiling
Cell-Cell sensors may have a different glass than the install PV modules and may soil differently
Sensor Measurement Uncertainty Reference
Class A Current Input ±2% (absolute) 3 Class A Voltage Input ±2% (absolute) 3 Class A Power Input ±3% (absolute) 3 Class A Current Output ±2% (absolute) 3 Class A Voltage Output ±2% (absolute) 3 Class A Power Output ±3% (absolute) 3
Sensor Measurement Uncertainty Reference
Meter ±0.2% (absolute) 4
WMO 1.7-12 Atonometrics Whitepaper IEC 61724-1:2021 Section 11.1 IEC 62053-22:2020