Ami Tech's Solar DC Combiner Box ACB 18 is specifically designed for combining multiple source circuits from a PV array into a single DC source and monitoring large PV generators. Each source circuit is fused separately using a touch-safe fuse holder conforming to international standards. The combiner box allows fail-safe operation of the system in the unlikely event that a problem with a source circuit leads to abnormally high current. In addition, the combiner box provides a convenient means of isolating the DC portion of a PV system from the inverter for routine maintenance and troubleshooting.

The measurement module is equipped with current, voltage and temperature parameters and has an RS-485 port with MODBUS communication protocol to interface with other systems like FRTUs and Data Loggers.

Salient Features:-

  • IP65 class enclosure made out of UV resistant thermoplastic with transparent cover.
  • Integrated DC Disconnect Switch.
  • Finger Safe Fuse holder on both positive and negative solar strings.
  • Integrated String Monitoring for voltage, currents and PV temperature.
  • Continuous duty rated at 1000V DC.
  • Short-circuit, over-current, surge, ground fault and arc fault protections.
  • Long life, rust free stainless steel hardware.
  • Transparent front safety cover.
  • MODBUS over RS-485 communication interface.
  • Designed to comply with UL 1741, IEC 61439-2 and NEC standards.
  • ACB is available in 8 /16 / 24 string options.
  • String inputs through industry standard two part MC4 connectors.

Technical Specifications

Product Solar DC Combiner Box
Model ACB-18
Enclosure IP65, UV resistant thermoplastic
Degree of protection IP65
Operating temperature -5°C to +65°C
Protection class Class II
Max. Number of strings 8/12/16/24 or customized
String input connections 1000V MC4 connector
Fuse holders 1000V rated at 32A
Fuse links 1000V rated 12A/16A/20A/25A
SPD (Surge Protection Device) 1000V Class II, Imax 40KA
Disconnector switch 1000V DC rated 250A / customized
Internal cabling 1100V DC rated
Measurements Hall Sensor based optional 8-24 channels currents, DC bus voltage, internal temperature, solar module temperature through external sensor, and DC switch status
Communication Isolated RS485 port (Max. 30 Nos. of ACBs can be multi-dropped in one bus)
Communication Protocol MODBUS RTU with configurable baud rates (Default 9.6K)
Dimensions 900mm x 600mm x 170mm
Conforming standards DIN EN 60439-1, IEC 60 695-2-11, IEC 60 695-2-11, IEC 754-2, IEC60947-1,TUV, IEC60947-3,VDE0470-1, UL94-V0 UL94-5VA,NF EN 61643- 11, IEC 61643-1, IEC 60269-6, UL 2579