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String Monitoring Box

Fully customizable up to 32 strings
Available from 600 VDC to 1500 VDC
Available in UV resistant FRP/GRP/PC enclosure (IP66, IK10)
Built-in touch safe fuse & fuse holders and DC Isolator/ MCCB.
Integrated surge protection devices (SPD) & pressure equalizers
Individual string level monitoring, DC switch status, SPD status, Bus voltage
Measurement accuracy : +/- 0.5%
Communication protocol- RS485 MODBUS, Wirlesss, OFC communication
Class II insulation
Ambient Temperature -10°C to +55°C
In compliance with IEC 61439 & UL 1741 standards

Compliance & Warranty

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About this item:

Product Description

The Solar String Monitoring Box (SMB) is a cutting-edge solution designed to optimize the performance and efficiency of solar photovoltaic (PV) systems. As solar energy continues to gain traction as a sustainable and renewable energy source, SMBs play a crucial role in ensuring the reliability and longevity of solar installations.

At its core, the SMB is a compact device that integrates seamlessly into solar PV arrays, typically positioned at the junction box of each string. Its primary function is to monitor the performance of individual strings, providing real-time data on key parameters such as voltage, current, temperature, and irradiance.

By continuously collecting and analyzing this data, the SMB enables early detection of potential issues that could impact system performance. Whether it’s shading, soiling, panel degradation, or mismatch, the SMB’s advanced algorithms can pinpoint anomalies and alert operators to take proactive measures.

One of the key advantages of SMBs is their ability to facilitate remote monitoring and diagnostics. Operators can access detailed performance data and diagnostic reports from a centralized platform, enabling them to make informed decisions and streamline maintenance activities.

Implementing SMBs in solar PV systems offers numerous benefits. It improves overall system efficiency by optimizing the performance of individual strings, thereby maximizing energy generation, and minimizing losses. Additionally, SMBs enhance system reliability by reducing the risk of unexpected failures and downtime, ultimately contributing to cost savings and maximizing return on investment.

In conclusion, the Solar String Monitoring Box (SMB) represents a significant advancement in solar PV system management. Its ability to provide real-time insights, proactive fault detection, and remote monitoring capabilities makes it an indispensable tool for optimizing the performance and longevity of solar installations in the renewable energy landscape.

Technical Specification

1. Enclosure
• Material: Weatherproof and durable FRP/PC enclosure
• Protection Rating: IP65 or higher for protection against dust, water, and environmental elements.
• Dimensions: Customizable sizes to accommodate required components and installation specifications.
• Mounting: Wall-mounted or pole-mounted options available for flexible installation in various solar PV array configurations.

2. Input Terminals
• Rated Voltage: Compatible with the voltage rating of the solar PV array, typically ranging from 600V to 1500V DC.
• Input Strings: Configurable to accommodate multiple input strings of solar panels, with options for series and parallel connections.
• Input Capacity: Depending on the system design and capacity, SCBs may support input capacities ranging from 6 to 24 strings or more.

3. String Monitoring and Protection
• Monitoring Devices: Built-in monitoring devices such as string-level DC combiners, string current sensors, and voltage meters for real-time monitoring of string performance.
• Overcurrent Protection: Circuit breakers or fuses rated for DC operation to protect individual strings from overcurrent conditions and faults.
• Surge Protection: Integrated surge protection devices to safeguard against lightning strikes and transient voltage surges.

4. Busbars and Connectors
• Material: High-conductivity copper busbars for efficient and low-resistance power distribution.
• Rating: Rated for continuous operation at system voltage levels, typically ranging from 600V to 1500V DC.
• Connection Type: Bolted or compression-type connectors for secure and reliable connection of input strings and output cables.

5. Monitoring and Control
• Communication: Optional communication interfaces (e.g., RS485, Modbus, Ethernet) for remote monitoring and data logging of string-level performance metrics.
• Alarm Indication: Visual or audible alarms for fault detection, abnormal string performance, or system malfunctions.
• Remote Monitoring: Compatibility with external monitoring systems or SCADA for centralized monitoring and control of multiple SCBs within a solar PV installation.

6. Environmental Conditions
• Operating Temperature: -25°C to +60°C (may vary based on enclosure and component specifications) to withstand varying environmental conditions.
• Humidity: Operating humidity range of 5% to 95% RH (non-condensing) to ensure reliable operation in different climatic conditions.
• Altitude: Rated for operation at altitudes up to 2000 meters above sea level (may vary depending on design considerations).

7. Compliance and Certification
• Standards: Designed and manufactured in compliance with relevant international standards (e.g., IEC 61439, UL 1741).
• Certification: CE marking or equivalent certifications indicating compliance with safety and performance standards for solar PV equipment.

8. Accessories and Optional Features
• Temperature Sensors: Integrated temperature sensors for monitoring ambient temperature within the SCB enclosure.
• Remote Trip Facility: Remote trip functionality for circuit breakers to facilitate quick isolation of faulty strings during maintenance or troubleshooting.
• Lightning Arresters: Additional lightning arresters for enhanced protection against lightning-induced surges in areas prone to thunderstorms.
• Alarm Notifications: Configurable alarm notifications via email or SMS for immediate alerts on string faults, anomalies, or performance deviations.
• Integration: Open architecture design for seamless integration with third-party monitoring and control systems using standard communication protocols.
• In case of monitoring:
• Communication:
• Communication Protocols: Compatibility with industry-standard communication protocols such as Modbus RTU, Modbus TCP/IP, or RS485 for seamless integration with monitoring systems.
• Wireless Connectivity: Optional support for wireless communication protocols such as Zigbee or Bluetooth for remote monitoring and data transmission.
• Data Transmission Rate: High-speed data transmission capabilities to ensure real-time monitoring and response to changes in string performance.
• Data Acquisition:
• Voltage Measurement Range: Typically, compatible with DC voltages ranging from 0V to 1500V DC, suitable for various solar PV array configurations.
• Accuracy Range: ± 0.5%
• Current Measurement Range: Support for precise measurement of string currents ranging from a few milliamperes to several amperes.
• Temperature Measurement: Integrated temperature sensors for monitoring ambient temperature and solar panel temperatures.
• SPD status & DC switch status: Provision for integrating SPD status & DC switch status.
• Irradiance Measurement: Optional sensors for measuring solar irradiance levels to assess solar panel performance.

FAQ

1. What are the Types of Communication medium used in SMB?

Wired RS485, Optical Fiber or Wireless RF based.

2. Can we use SMB for String Inverter?

Yes, by using a Hall effect Monitoring card having single bus voltage.

3. Whether a Monitoring Card should be used on the Positive or Negative side?

Both Sides Can be used, preferably for Shunt Based Negative and Hall effect Based Positive which is CT type.