Solar Monitoring Station EKO MS-90+

Solar Monitoring Station EKO MS-90+

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The Solar Monitoring Station EKO MS-90+ is a cost-effective system combining DNI Sensor EKO MS-90 and Pyranometer EKO MS-80S for DNI, GHI and DHI data without sun tracker.

These two instruments are connected via EKO C-Box Modbus Processing interface with a GPS receiver and a processing unit.

The station accurately measures DNI and GHI and calculates Diffuse irradiance (DHI) from the measurement data and the sun position.

The EKO C-Box is delivered with a 10 m cable, the sensor has a 1.5 m cable to connect to the C-box.

The station provides a digital output signal (RS-485 Modbus RTU) and can be easily connected to various data acquisition systems in solar energy projects and meteorological stations (dataloggers, inverters, SCADA etc). It can also be connected to a PC.

The DNI Sensor EKO MS-90 sensor has a broad spectral response (300-2500 nm) and is calibrated outdoors with a pyrheliometer.


C-Box Modbus Processing interface EKO

The C-Box Modbus Processing interface provides different functions for sensor control and data processing of different EKO sensors.

In combination with the DNI sensor EKO MS-90, the pulsed output can be converted into a continuous output Voltage or RS-485 Modbus RTU signal. With an additional pyranometer and optional GPS receiver a turnkey system can be configured to measure DNI, GHI and DHI over Modbus.     

By using this device, the DNI sensor EKO MS-90 analogue voltage output peaks correspondent to DNI are detected and converted to digital. It then transmits and receives data with serial communication method.

Since it is compatible with RS-485 communication, it is possible to connect with PV monitoring devices, which have this communication function. By setting the pyranometer sensitivity on signal converter, the voltage signal output from pyranometer can be converted to solar irradiance.

The signal converter is integrated in an IP65 enclosure for outdoor installation. The settings for the measurements and communication can be changed by using the setup software.

DNI Sensor EKO MS-90

The DNI Sensor EKO MS-90 measures the Direct Normal Irradiance (DNI) without a sun-tracker.

It has a rotating mirror, which only reflects the sunbeam onto a thermal detector.

The DNI Sensor EKO MS-90 can be used in combination with any pyranometer to measure the DNI and Global Horizontal Irradiance (GHI). Hence the Diffuse Horizontal Irradiance (DHI) can be calculated.


Solar Monitoring Station EKO MS-90+

Characteristic Description
Classification ISO 9060:2018
Class C (DNI) + Class A (GHI, DHI)
Output DNI, GHI, DHI (RS-485 Modbus RTU)
Temperature response
-20°C … +40°C
± 5 %
Non-linearity ± 2.5 %
Operating temperature range -20 … +50 °C
Wavelength range 300 - 2500 nm (50% points)
Power supply 10.5 - 12.5 VDC
Dimensions mm 350 (W) x 250 (L) x 200 (H) incl. optional base plate)
Weight 2.5 kg
Ingress protection IP 67
Cable length 10 m
Geographic application Lattitude (-58º … +58º ) / Longitude (0º --- +360º)
Power consumption < 6 W
Warranty 5 years
Manufacturer EKO Instruments

C-Box Modbus Processing interface EKO

Characteristic Description

Communication interface

RS-485 Modbus RTU


2 units


DNI, GHI, DHI processing

Operating temperature range

-40 … +80 °C

Voltage range

12 V

Power consumption

< 1 W

Average Power Consumption

0.5 W

Power Supply

12 VDC ± 10%  (Note: Supply voltage critical for MS-90)


IP 65

Dimension (W x L x H)

125 x 60 x 80 mm

Weight (without cable)

0.5 kg

Input Signals

EKO MS-90 DNI sensor

Analog pulse 0 .. 2 V

EKO MS-80S pyranometer

RS-485 Modbus RTU


5 years


EKO Instruments

C-Box system Specification

Input parameters EKO MS-90 DNI sensor DNI
EKO MS-80S pyranometer GHI
Output parameters DNI / GHI / DHI
(Meta data T, RH, Tilt, Long / Lat position, Solar Position, Time)
Sampling 1 s (15 s DNI)
Irradiance range DNI (Measured) 120 … 1600 W/m²
Irradiance range GHI (Measured) 0 … 1600 W/m²
Irradiance range DHI (Calculated) 0 … 500 W/m²
(DHI = GHI when DNI < 120 W/m²)

DNI Sensor EKO MS-90

Characteristic Description
Classification ISO 9060:2018
Sensitivity 1.785 µV/W/m²
Spectral range 300 … 2700 nm
Operating temperature    -20 ... +50 °C
Power supply     10.5 … 12.5 V DC
Output 0 - 2V (Pulse)
Non-linearity ±2.5 %
Wavelength range    300 - 2500 nm (50% points)
Geographic application    Lattitude (-58º to 58º ) / Longitude (0º to 360º)
Power consumption    < 5 W
Protection    IP67
Dimension (W x L x H) 350 x 250 x 200 mm (incl. optional base plate)
Weight (without cable) 2.5 kg
Cable length    10 m
Cable length    20 / 30 / 50 m
Base plate    350 x 250 / levelling feet mm
Power supply 100 to 240 VAC / 12VDC / 200 x 140 x 80 mm / 2.5 kg
Warranty 5 years
Manufacturer    EKO Instruments


C-Box Modbus Processing interface EKO

DNI Sensor EKO MS-90


Recommended connection of C-Box to Ammonit Meteo-40 Data Logger
Biasing with M83570 and galvanic isolation with Repeater M84100.

Important Note: Restrict the power supply for the C-Box to 12 V.

Cable Colors for C-Box cable: Supply and RS485 Interface

Cable Color C-Box Function
brown + 12V DC
white GND
blue Data +
black Data -
grey not connected