String Monitoring Unit (SMU)

String Monitoring Unit (SMU) for monitoring up to 48 module strings.

The string monitoring unit (SMU) precisely records all electrical data of a PV generator in real time regardless of the inverter in use and can monitor up to four status-signaling contacts. This ensures the continuous monitoring of the direct current side of PV systems. Data can be recorded smoothly with the Modbus RTU protocol and the provided RS485 interface. The SMU is compatible with meteocontrol data loggers.

Features

  • Measurement of 8 to 24 individual strings, 16 to 48 strings with double assignment
  • Error recognition in the PV generator on the string level
  • Precise, real-time measured value recording
  • Compatible with system voltage levels of up to 1,500 V DC
  • Manufacturer-independent, open Modbus RTU protocol
  • Comprehensive status monitoring
  • Preconfiguration for easy connectivity to the data loggers WEB’log and blue’Log X-Series

Your benefits

  • Highly flexible system design
  • Detection of even small yield losses – assurance of yields on the string level
  • Cost-efficient monitoring of the direct current side of your PV system
  • Future-proof hardware also for system designs with 1,500 V DC
  • Effortless connection to any SPS or data logger
  • Time and cost savings through simplified commissioning process

String Combiner Boxes (SCBs)

Custom string monitoring - monitoring on the string level from Commercial to Utility Scale.

Successful detection of yield-reducing factors in commercial photovoltaic systems and in PV power plants depends largely on the monitoring system's design. Yield monitoring on the string level plays a particularly important role for systems with central inverter concepts in order to locate possible power losses in the PV generator as quickly as possible and thus to assure the long-term expected performance level of the PV system.

 

For this purpose, our string combiner boxes (SCBs) provide precise measured value recording of all electrical indicators (string current, system voltage, total current and total power) as well as the option of monitoring the status of the surge arrester, DC circuit breaker, door contact and the interior cabinet temperature.

 

The SCB also fits perfectly into the relevant system topology. As a result, it facilitates safe and, above all, accurate monitoring that is independent of any project-specific string layout and grounding concept.

We would be delighted to offer you a tailor-made solution to suit your personal and project-specific requirements.

Features

  • Measurement of 8 to 24 individual strings or 16 to 48 strings with double assignment
  • Individual string protection in the positive or in the positive and negative poles
  • Integrated surge arrester
  • Integrated DC circuit breaker
  • Comprehensive status monitoring
  • System voltages up to 1,500 V DC
  • Manufacturer-independent, open Modbus RTU protocol
  • Glass fiber-reinforced plastic casing for harsh industrial use
  • Pre-configuration for easy connectivity to the data loggers WEB’log and blue’Log X-Series
  • High level of expandability

Your benefits

  • Precise yield monitoring on the string level
  • Cost-efficient, high-quality string monitoring
  • Can be adapted flexibly to the grounding concept and project-specific requirements
  • Reduced maintenance requirements thanks to easy fuse replacement
  • Maximum flexibility as regards system design through tailored expansions
  • Detection of even minor yield losses
  • Advanced monitoring through querying status signaling contacts
  • Tailor-made solution for your PV power plant