Solar Monitoring Stations

STR-21G-S1

  • With Harmonic Drive®
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Solar Monitoring Stations

Features

  • Integrated sun-position sensor and GPS for quick, easy and accurate setup
  • Efficient, Cost-Saving, Low Power Consumption
  • Easy Integration with any DAQ system
  • Harmonic Drive® mechanical gear system, for maximum positioning accuracy
  • Deployed in Antarctica, proven in extreme climates worldwide

STR-21G-S1

  • With Harmonic Drive®

The STR-21G-S1 is a solar monitoring station designed for high-precision solar radiation measurement. It delivers unbeatable DNI, GHI, and DHI Accuracy, reliability and value for solar energy research, monitoring, and meteorological applications.

Add to list
Solar Monitoring Stations

Features

  • Integrated sun-position sensor and GPS for quick, easy and accurate setup
  • Efficient, Cost-Saving, Low Power Consumption
  • Easy Integration with any DAQ system
  • Harmonic Drive® mechanical gear system, for maximum positioning accuracy
  • Deployed in Antarctica, proven in extreme climates worldwide
Find out more

Overview

The STR-21G-S1 is designed for high-precision solar radiation measurement and provides industry-leading accuracy, reliability and value for solar energy research, monitoring, and meteorological applications.

Built on the STR-21G platform, a single-arm, 2-axis sun tracker with an easy, fully automated setup procedure and low power consumption, the STR-21G-S1 delivers smooth, consistent, and precise tracking.

Together with the ISO 9060:2018 class-leading accuracy and performance of EKO's signature Class A MS-80S Pyranometer, and Class A MS-57 Pyrheliometer, the STR-21G-S1 with shading disk assembly is an elite solution; proven worldwide in a range of environments and ready to deliver outstanding results.

Configuration

STR-21G Specifications

Description

STR-21G Sun Tracker

With integrated GPS, sun position sensor, and a Harmonic Geared type stepper motor, the STR-21G Sun Tracker is built to deliver unparalleled precision, optimal positioning, and reliability, whatever the weather.

Easy to set up, the STR-21G automatically adjusts to the sun's position, even if the tracker is not oriented or levelled correctly, and can support a range of Global, Diffuse and Direct Radiation measurement sensors for custom configurations.

The single configurable arm of the STR-21G can mount the MS-57 Class A Pyrheliometer for DNI readings and the optional MD-81-10 shading disk assembly, shielding any top-mounted pyranometer for diffuse solar radiation measurements.

Attribute
Arms 1
Pointing accuracy Solar elevation: 0 to 87° < 0.01°
Angle resolution 0.009°
Rotation angle Zenith -15 to 95°
Rotation angle Azimuth 0 to 360°
Torque 12 N⋅m
Payload side arms 7kg
Sun sensor FOV 30°
Ingress protection IP 65
Operating temperature range -40 to 50°C
Communication RS-422 / 232C
Power consumption < 10W
Motor Stepper motor
Driving technology Harmonic Drive®
Tracking modes Automatic & Manual
Tripod Table tripod
Pyrheliometer mount Adjustable / One sensor position
Cable length 10m
Weight 14.5 kg (with tripod)

MS-80S Specifications

Description

MS-80S Pyranometer

Based on a revolutionary design, the MS-80S Pyranometer is best-in-class for accuracy, speed, reliability and is one of the only top tier 'fast-response' and 'spectrally flat' Class A pyranometers with unprecedented low zero-offset behaviour available.

Featuring a state-of-the-art thermopile detector and Quartz diffusor technology, new internal diagnostics, a unique 4-channel interface, and Level A EMI/EMC electronic surge filter protection, the MS-80S is IEC 61724-1 compliant and the standout choice for every application.

Attribute
ISO 9060:2018 Class A
Response time 95% < 0.5 Sec
Zero offset A - Thermal Radiation (200W/m²) ± 1W/m²
Zero offset B - Temperature change (5K/hr) ± 1W/m²
Zero offset C - Total zero off-set ± 2W/m²
Non-stability (change/year) < 0.5% / 5 years
Non-linearity (100 to 1000W/m²) ± 0.2%
Directional Response (at 1000W/m² | 0 to 80°) ± 10W/m²
Spectral Error ± 0.2%
Temperature Response (-20°C to 50°C) ± 0.5%
Tilt Response (0-90° | 1000W/m²) ± 0.2%
Additional Signal Processing Error < 1 W/m²
Technical Features
Wavelength Range (nm) 285 to 3000
Irradiance range (W/m²) 0 to 4000
Signal Output Modbus 485 RTU / SDI-12 4-20mA / 0-10mA / 0-1V
Sensor Diagnostic Relative Humidity ± 2% Temp. ± 0.1% / Tilt Angle ± 1°
Operating temperature -40 to 80°C
Supply voltage 5 to 30 VDC
Power Consumption < 0.2W
Ingress Protection IP 67
Calibration traceability / uncertainty ISO 17025 / WRR / < 0.7% (k = 1.96)
Standard Cable Length 10m (Optional lengths 20m, 30m, 50m)

MS-57 Specifications

Description

MS-57 Pyrheliometer

The MS-57 Class A Pyrheliometer is a fast, accurate, stable, and exceptionally reliable direct normal incidence (DNI) solar irradiance sensor.

'Fast-response' and 'spectrally flat' under ISO 9060:2018 specifications, each MS-57 is calibrated outdoors and tested against reference sensors fully traceable to the World Radiometric Reference. With an integrated low power window heater to prevent dew deposition or frost on the outside window, and competition-beating long-term stability, the MS-57 is truly 'all-weather' and perfectly suited to a range of applications.

Attribute
ISO 9060:2018 Class A
Response time 95% < 0.2 Sec
Zero offset A - Thermal Radiation (200W/m²) 0 W/m²
Zero offset B - Temperature change (5K/hr) ± 1W/m²
Zero offset C - Total zero off-set ± 1W/m²
Non-stability (change/year) < 0.5% / 5 years
Non-linearity (100 to 1000W/m²) ± 0.2%
Spectral Error ± 0.2%
Temperature Response (-20°C to 50°C) ± 0.5%
Tilt Response (0-90° | 1000W/m²) ± 0.2%
Technical Features
Wavelength Range (nm) 200 to 4000 (50% points)
Irradiance range (W/m²) 0 to 4000
Sensitivity (μV/W/m²) Approx. 7
Signal Output Analog
Impedance (Ω) < 15000
Operating temperature -40 to 80°C
Ingress Protection IP 67
Standard Cable Length 10m (Optional lengths 20m, 30m, 50m)
Window Heater Power Requirement DC 12V / 0.5W
Temperature Sensors PT-100 Class A, Thermistor 44031 10kΩ

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