String-Box
A String-Box is a field switchboard for the monitoring of string current and immediately diagnose possible anomalies. This device is equipped with general disconnector designed for photovoltaic applications. The cover is made of UV-proof polyester with an IP54 degree of protection which allows to connect up to 32 strings (with a maximum incoming current of 9A for each string). The String-box guarantees total compatibility with any control system.
Technical features
CR-SMU-32(16)-1K280 String-Box monitors string current and parallel voltage, and it can also signal the end of life of the SPD, the internal temperature or other feature sizes on demand, such as the panel field temperature
Designed and built for indoor and outdoor applications
Parallel connection up to 32 strings of 9A each (16 measurement channels)
Optical fiber communication, to guarantee maximum reliability, also in the event of atmospheric discharges
IEC 60870-101 communication protocol and MODBUS RTU integrated
Integrated to SCADA system
Protection fuses for each input on the positive and negative pole
Cable connection up to 16 mm2 for each input
Surge arrester against atmospheric overcurrent
Direct power supply from the photovoltaic field or optionally from auxiliary voltage
Digital insulated input for local monitoring
Isolated analog input for environmental sensors (1xPT100, 0-10V, 4-20mA)
Digital output with configurable voltage free contacts
Polyester cover for outdoor application with IP54 degree of protection
Advantages
It ensures effective and efficient detection and prevention of failure, thus improving the efficiency, reliability and safety of the system
It is very simple to identify and solve any problem on the panels or on the microinverters
All the parameters of each single module are monitored
Remote and local signal of alarm conditions
Applications
Photovoltaic plants
Data Sheet String Box
Incoming DC Maximum Tension
V
1.000
Maximum output current
A
280
Maximum inverse current
A
6.000
Nominal current string fuse
A
Up to 25
Maximum current per channel
A
25
Number of strings
8/16/32
Number of incoming cables
16/32/64
IP Degree of protection
IP54*
Power supply for SMU
V
24
Nominal voltage of switch DC
V
1000
Nominal current of switch DC
A
400
SPD Type
2
*Up to IP65, upon request
*Up to IP65, upon request
Related projects to String-Box
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Design, construction, and commissioning of a rooftop photovoltaic system (PV) 168kWp including n. 594 solar panels 280kWp, n. 3 inverters 50kW, and low-voltage (LV) switchboards Euro-SDS 415/240V 60Hz, for the energy supply of a big coffee roastery, which has a production capacity of 1200 kg/h of ground and roasted Cuban coffee.
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