Model string.bloxx AIO 24/12 - PV Plant Monitoring System
From Photovoltaic String Monitoring
Effective PV Monitoring requires constant, solid and traceable PV Plant monitoring data in order to determine actual performance and fulfil owner/investor expectations. Operators are interested to identify errors and losses in a reliable way to trigger appropriate actions for maximizing energy harvest during the total system lifetime. With the monitoring of PV Module strings, design and production errors will be recognized on the DC side with high resolution down to PV Module level.
Product Overview
Using DC shunts (vs. Hall Effect sensors) the string.bloxx provides current measurements typically 10 times more accurate and not susceptible to temperature variance. This equates to higher accuracy measurements and better understanding of true system performance. In addition, string voltage (up to 1000V) and DC power on every string can be continuously monitored ensuring maximum system productivity.
Continuous measurement of both cabinet and panel temperatures, along with overvoltage monitoring and main switch control greatly and improves system diagnostics.
This accurate measurement is inverter independent and gives feedback about losses due to inverter malfunction, soiling, shading, PV Module degradation etc. .
The string.bloxx communication uses industry standard Modbus protocols for easy and fast integration and reliable data exchange with the data logger. For longer communication distances fiber optic technology is used.
The benefits of string.bloxx AIO 24/12:
- The All-In-One Solution improves your Project ROI and offers increased local content
- Unifies DC measurement, fuses, overvoltage protection & communication
- Significant reduction of interfaces leads to reduced risk and faster plant installation time
Key Features
- Connection for strings: Up to 24 PV strings
- 24 String current inputs: ± 13 A String current, ± 312 A summary @ 60°C
- 48 PV fuses incl. fuse holders: 15 A (typical) or based on customer requirements, positive and negative side
- Inputs for current measurement: 12 Analog inputs for current measurement
- ± 26 A string current (calibrated)
- nalog input channel for voltage measurement: 1 channel, 0-1000 VDC string voltage
- Temperature sensor: 1 On board temperature sensor
- cabinet temperature
- VDC Layout: On board 1000 VDC SPD, RS 485 SPD
- 2 Digital inputs: Monitoring of overvoltage protection and main switch
- Signal conditioning: Calculated DC Power, linearization, mean value, scaling, alarm
- RS485 fieldbus interface: Up to 115.2 kbps: Modbus-RTU, ASCII (optional OEM protocols)
- Connectivity: Data logger (e. g. Q.reader) and gantner.webportal for worldwide access or other 3rd party applications
Technical Specifications
Input Current
- Max. Number: 24
- Max. Current: ± 13 A
- Connection: 0.25 mm2 - 6 mm2 push-in spring-cage connection
Current measurement
- Max. Number: 12
- Range: ± 26 A
- Accuracy: 0.25 %
Voltage measurement
- Number: 1
- Range: 0-1000 VDC
- Accuracy: 0.2 %
- Connection: 0.25 mm2 - 6 mm2 push-in spring-cage connection
Input cabinet temperature
- Number: 1
- Type: Digital, onboard
- Range: -40 °C till +125 °C
- Accuracy: ± 0.5 K
Digital Inputs
- Number: 2
- Input: State
- Connection: 0.25 mm2 - 1.5 mm2 push-in spring-cage connection
Power Supply
- Power supply: 10 up to 55 VDC, overvoltage and overload protection
- Power consumption: approx. 1.5 W (0.4W at 30 seconds sample rate)
- Connection: 0.2 mm2 - 2.5 mm2 push-in spring-cage connection
Communication Interface
- Standard: RS-485, 2-wire
- Data format: 8n1
- Protocols: Modbus-RTU: 19.200 bps (default), range: 9.600 bps up to 115.200 bps
- Number of devices on the bus: max. 250
- Connection: 0.2 mm2 - 2.5 mm2 push-in spring-cage connection
Protection
- Overvoltage protection PV section: Overvoltage arrester 2 / II acc. to EN 61643-11 / IEC 61643-1/-11
- Nominal surge current: (8/20) 20 kA
- with 3-stage DC- switch for PV Power Plants, up to 1000VDC
- Overvoltage protection Communication (RS485): Gas Discharge Tube - GDTs / Gas-Plasma-arrester mini trigard symmetrical SMT;
- Peak- impulse-current: 10 kA, 600 Watt Transient Voltage Suppressors
- Electromagnetic Compatibility: According to EN 61000-4 and EN 55011
- Relative humidity: 5 % up to 95 % at 50°C, non-condensing
Environmental
- Operating temperature: -20°C up to +60°C @ max 312 A current
- Storage temperature: -40°C up to +85°C
- Relative humidity: 5 % up to 95 % at 50°C, non-condensing
Mechanical
- Dimensions (L x W x D): (450 x 321 x 55) mm
- Weight: approx. 2800 g
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