Modbus solar reference cell RC22M™

digitalRS485Modbus RTU

Overview
The RC22M Reference Cell and Accessories system is a comprehensive irradiance, temperature, and wind measurement solution designed for commercial and industrial PV arrays. The RC22M pairs with Mars™ sensors for accurate performance monitoring, helping to eliminate soiling-related inaccuracies.

Key features

• Measures irradiance (0 to 1500 W/m²), wind speed, back-of-module temperature, and ambient temperature.
• High accuracy across a wide irradiance range with auto-ranging; calibrations at both 1000 W/m² (STC) and 135 W/m² (BSTC).
• Glass-to-edge design to ensure water roll-off and reduce soiling for more accurate long-term measurements.
• Digital communication via Modbus RTU over RS485 for easy integration into SCADA and data acquisition systems.
• Modular, expandable design with optional accessories (wind speed sensors, ambient temperature RTDs, back-of-module RTDs).
• Compact, easy-to-mount package; configuration and calibration managed via dedicated software. Optional cables and connectors available in various lengths.

Technical specifications

• Product Number: 880105_A
• Measurement range: 0 to 1500 W/m²
• Operating temperature range: -40 to 80 °C
• Input voltage: 10–30 VDC
• Current consumption: Without wind sensor: typ. 6 mA; with wind sensor: < 60 mA
• Communication protocol: Modbus over RS485 (RTU), user-settable address
• Ingress protection rating: IP67
• Measurement uncertainty: ±2.0% @ 1000 W/m²
• Irradiance calibration: ±1.2% @ 1000 W/m²
• Dimensions: 65 x 65 x 48.0 mm (2.56 x 2.56 x 1.89 in)