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The String Combiner Box, beside its main function of combining the outputs of a number of photovoltaic panel strings into one or two outputs to feed the main inverter, also provides overcurrent and overvoltage protection, arc fault detection and surge protection as well as current and voltage monitoring for each string.

In addition, to comply with provisions in section 690.12 of US national electric codes (NEC) 2014, many combiner boxes implement the Rapid Shutdown function  required in photovoltaic (PV) installations mounted on buildings or rooftops to  mitigate electrical and fire hazard for first responders and can also have means to exchange data and control information with a central server.

With our range of high-performance STM32 Microcontrollers, flexible multi-protocol power line communication (PLMs) and wireless connectivity solutions as well as metering ICs and high-precision operational amplifiers for current and voltage measurement we can help developers design high-efficiency String Combiner Boxes that meet safety and fire regulations requirements

Smart string combiner box block diagram

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Technical Documentation

    • Description Version Size Action
      AN4653
      Cycling endurance and data retention of high density EEPROM based on CMOS F8H process
      1.0
      267.34 KB
      PDF
      AN4653

      Cycling endurance and data retention of high density EEPROM based on CMOS F8H process

    • Description Version Size Action
      DN0010
      Adapting ST power line modem evaluation boards to communicate over a DC bus
      1.2
      404.54 KB
      PDF
      DN0010

      Adapting ST power line modem evaluation boards to communicate over a DC bus

Presentations & Training Material

    • Description Version Size Action
      EEPROM 2 Mbit highest density memories 1.0
      2.49 MB
      PDF

      EEPROM 2 Mbit highest density memories

Publications and Collaterals

    • Description Version Size Action
      ST Diodes Finder : the new app for Android and iOS 2.0
      1.46 MB
      PDF
      Turnkey PLC chipset for smart-energy infrastructure 10.2017
      775.07 KB
      PDF

      ST Diodes Finder : the new app for Android and iOS

      Turnkey PLC chipset for smart-energy infrastructure

    • Description Version Size Action
      STM32F3 series - Mainstream 32-bit MCUs 17.09
      2.18 MB
      PDF

      STM32F3 series - Mainstream 32-bit MCUs