String.CB
DC COMBINER BOX
Customized DC Combiner Boxes for Reliable PV Performance
String.CB is a customized DC combiner box manufactured in Germany for utility-scale photovoltaic systems. Available as monitored or passive versions, it safely combines PV strings and provides optional inverter-independent string monitoring through integrated String.Bloxx measurement technology.
Feature Highlights
Flexible String Configuration
Supports 2, 4, 8, 12, 16, 24 or 32 PV strings, with custom configurations available on request
1000/1500 VDC Design
Standardized layouts for modern utility-scale photovoltaic systems
Integrated String Monitoring
Optional String.Bloxx technology enables precise inverter-independent string-level measurements
Surge Protection
Integrated surge protective devices (SPD) for reliable protection against overvoltage events in 1000 VDC and 1500 VDC systems
Protected Fuse Switches
Lever-operated switch fuses with touch-safe design for secure maintenance and operation
DC Main Disconnect
Load break switches rated from 30 A to 400 A for safe system isolation
Flexible String Connections
Compatible with terminals, MC4, MC4 EVO2 and Sunclix connectors
Robust Outdoor Enclosure
IP65 polyester monobloc housing for wall or rack mounting in harsh environments
Custom Cable Entry Options
Cable glands or panel-mounted PV connectors for maximum installation flexibility
How String.CBs works
In utility-scale photovoltaic plants, hundreds or thousands of PV strings must be combined and connected reliably to the inverter. String.CB performs this task by collecting multiple strings, protecting each input with dedicated fuses and routing the combined current through larger output conductors.
Passive versions provide this electrical aggregation and protection only. They are the ideal choice when no string-level measurements are required and a robust, cost-efficient solution is sufficient.
Monitored versions include an integrated String.Bloxx measurement unit that continuously monitors string currents, DC voltage, power, cabinet temperature and status signals. This inverter-independent monitoring enables early detection of blown fuses, disconnected strings, shading, soiling and module degradation.
All measurement data from monitored versions is transmitted via Modbus RTU to SCADA systems, data loggers or Gantner.IQX for real-time monitoring and advanced analytics. This allows operators to identify underperforming strings quickly, reduce troubleshooting time and maximize energy yield throughout the entire plant lifetime.
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