Nordic India - DCDB / ACDB / STRING MONITORING COMBINER BOX

Nordic India offers array junction (DC distribution) boxes, string monitoring boxes, AC distribution boxes and low voltage electrical distribution and protection panels customized for solar PV applications. Our products use IP65 rated enclosures, and DC and AC switchgear from leading global manufacturers such as ABB, Schneider, and Mersen, and are designed to meet international electrical standards. Features offered under these products are described below:

Array Junction Boxes / DC Distribution Boxes / String Combiner Boxes

These boxes provide interconnection between input leads from the solar module arrays and the output leads to the inverter. These boxes are customized for different configurations based on the series-parallel configuration layout of the solar array. Common features of these boxes include:

Compatible with 600V-1500V DC solar PV installations
DC inputs can range from 1 to 24 based on number of inputs
Standard box configurations available for rooftop installations
Customized boxes manufactured for utility scale MW solar installations
DCDBs use IP65/66 polycarbonate/GRP enclosures suitable for outdoor installations, with flammability and impact protection
Input and output cable connectors can be provided through IP65 cable glands or MC4 connectors
Overcurrent protection for individual PV strings through PV fuses
Protection against surge currents on DC side through SPDs
DC MCBs/switches to disconnect DC generation and prevent export of power to AC side during maintenance

String Monitoring Combiner Box (SMCB)

In addition to the features offered in the string combiner boxes, these boxes additionally contain components for monitoring of individual string DC currents and voltages. These are useful to diagnose and troubleshoot interconnections in a utility scale MW plant. Monitoring features include:

String current monitoring (1-24 strings) through Hall effect based current sensors
DC voltage monitoring sensors (0-1500V), and temperature monitoring sensor can be provided inside box
Sensors support MODBUS RS485 communications to centrally installed SCADA systems
SPDs are installed to protect communication devices
Power supply for sensors and communications can be provided through AC or DC sources.

AC Distribution Boxes / AC Combiner Boxes

The AC distribution boxes combine multiple outputs from one or more inverters to interconnect to the main service panel or load panel in the house. Common features of these boxes include:

IP65/66 polycarbonate or metal enclosures for outdoor/indoor installations
Standard box configurations available for rooftop installations
Customized boxes manufactured for utility scale MW solar installations
Input and output connections through cable glands
Overcurrent and short circuit through MCB or MCCBs.
Protection against lightning strikes/surges through AC surge protection devices (SPDs)
AC disconnect switch to isolate and switch over loads to grid in case of maintenance of solar system.

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