Designing and Installing Trinasmart Systems August, 2013

1. Equipment

2. Design 3. Installation

4. Commissioning

Equipment

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Equipment (Optional) • Inverters designed to work with Smart Curve • MMU built-in

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1. Equipment

2. Design 3. Installation

4. Commissioning

Design Equipment Counts: Management Unit (MMU)  Management Units cover up to 360 Trinasmart modules each.  Connects to a maximum of 7 Gateways.  Each MMU can also communicate with inverters or AC meters that use the MODBUS protocol over RS-485 cable.  Each MMU requires an Ethernet connection for internet access.

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Design Gateway Layout:  Cover up to 120 smart modules within a 50’ signal radius.  Mount as close to the geographic center of the array as possible, as high off the roof or ground as possible.

 Obstructions such as AC units and roof parapets may cause interference and require placement of additional gateways.

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Design Smart Curve Trinasmart Modules:  Voc limited by hardware. Published in the datasheet and on the module data plate.  No voltage rise at lower temperatures. (No temp derating)  Design string length to the inverter MPP window. Example Voltage Calculation: Inverter MPP Range: 330-550 550/39.2(Voc)= 14 mod/ string.

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Trinasmart String Design

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Design Follow standard NEC Code using new Voc and Temp De-Rate + Inverter Max Vmp 650.0 600

600

548.8

548.8

600

600.0

550.0

550 526.6

500.0

531.2

505.4 510.8 495.0

484.2

Standard Vmp

479.2

450.0

Standard Voc

Smart Voc

Smart Vmp Inv MPP Upper Limit

396.400

400.0

Inverter MPP lower Limit

380.4 364.4

System Voltage Limit

350.0

300.0

330

330

330

5c

25c

45c

250.0

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Shade

• Modeling tools are now sophisticated enough to model benefits of Smart Modules in shade

Design Designing with known mismatch: Multiple Orientations  Multiple orientations create conditions similar to shade though generally benefit more from global and reflected irradiance.

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Design Different Length Strings in Parallel  No difference in module power between 6 module and 5 module string.

 Guideline: Keep string voltage within the inverter MPP window and overall difference in string length below 25%.

Electrical Layout

Physical Layout

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Design Modeling the effect of Smart Modules: Pvsyst: Change two parameters to approximate the effect of using Smart Modules in a system:  Use Linear Shade Model  Use 0% mismatch loss in the Detailed Losses section. Helioscope by Folsom Labs: Calculates the effect of Smart Modules at the component and system level. A 90 day trial subscription to Helioscope is available through Trina.

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1. Equipment

2. Design 3. Installation

4. Commissioning

Installation Collecting Module Barcodes:  Module barcodes are used to commission the smart module system.  Barcodes are located on the side of the J-box.  Remove the barcode label with the tab and place on your array drawings or the barcode list printed out from the Wizard configuration tool.  During configuration a CSV file can be downloaded to a mobile device for barcode scanning in the field.

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Mechanicals Trinasmart Standard Frame Modules:  60 and 72 Cell Modules – 35mm or 40mm  Junction Box is field replaceable.

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Installation Mounting the MMU:  120V outlet for power  Ethernet connection for internet access.  Near the inverter if logging AC output or inverter data.

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Installation Gateway Cable: Class 3 Circuits- Separated from power cabling - Use Type PLTC, Sunlight Resistant, 300V - 2 twisted pair cable -Not more than .31 outer diameter - 18-22 AWG depending on length of run and number of gateways. - Refer to NEC 725.136 Class 1 Circuits- Run with power cabling - Use Type TC, Sunlight Resistant, 600V. - 2 twisted pair - 18-22 AWG - Not more than .31 outer diameter - Must be fused before the MMU - Refer to NEC 725.35 II

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Installation Mounting the Gateways:  Gateways mount either to the module frame or on the racking system.  Mount near the center of the array section.  Make sure the wiring matches the terminal in the MMU.  Up to 7 Gateways can be ‘daisy chained’ together to cover more modules  The last gateway in the chain requires a termination resistor in the second terminal block (included with each gateway).

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Installation MMU Test Functions: These tests can be performed from the LCD screen on the MMU.    

Network Test Gateway Test PV Safe Power On

You can also customize any special network settings like fixed IP address or Proxy server on the LCD.

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1. Equipment

2. Design 3. Installation

4. Commissioning

Discover MMU Command Automatically:  Finds all components on the array (Trinasmart, Gateways etc)  Assigns communication instructions  Ensures that basic system functionality works Note: Modules will function produce power before discovery, but discovery turns on the optimization and communication

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Commissioning Monitoring configuration is part of commissioning a Trinasmart array.  Collect the MMU and module ID barcodes from the array.  Follow the steps in the configuration Wizard to add a new site or edit an existing project.

Note: Modules will function before the monitoring system is commissioned but module level data will not be available.

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Commissioning Check Array Function: Use the data collected by the Trinasmart modules to verify array function.

 Use the Voltage, Current, and Power data displayed on the Summary screen to verify that each module functions properly.  Black modules are reporting data but are at a low power level.  Tigo or Trina support can help you with any problems you may experience during this process. [email protected]

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Commissioning – Coming January 2014 • Commissioning Report with module-level data approved to replace IV curve tracing on large commercial arrays

Questions?

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