Technology Due Diligence: What to consider when choosing a single

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					Technology Due Diligence: What
 to consider when choosing a
      single-axis tracker
          Chris Lomibao
        Solar Energy Consultant


             June 16, 2011
Agenda


     Benefits of technology due diligence
     Single-axis tracking market overview – worldwide
     Technical review
     Quality and reliability
     Importance of supply chain
     Installation, operations and maintenance


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    Benefits of technology
    due diligence


      Supports financeability for
       emerging solar technologies
      Helps investors understand any
       possible risks to the project
      Can help capture the
       bankability of the product
      Piece of mind




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Single-axis tracking market overview - US


     In the US, the majority of the largest crystalline-
      silicon PV plants have been installed using SAT
      systems.
     SunPower has installed some of the largest SAT
      PV plants in the US (T0 and T20).
     Array Technologies has also installed over 60 MW
      of their Duratrack SAT in the US.



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US SAT Installation Examples

     SunPower T0 trackers at
      DeSoto Energy Center



                                     SunPower T20 trackers at the
                                      Nellis AFB




     ATI Duratrack trackers in
      Alamosa, CO
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Single-axis tracking market overview -
International

     Most of the PV systems built internationally were
      built using tracking systems
     Majority of PV systems in Spain are dual-axis
      tracking systems
     Many PV systems in South Korea, Italy and China
      were installed using SAT technology
     Notable international tracking manufacturers
      include: SunCarrier, Meca-Solar, and OSolar

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International Tracking Installation Examples


                                      6.58 MW Meca-Solar dual-
                                       axis tracker installation in
                                       Italy




    24 MW OSolar SAT
     installation in South Korea




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Technical Review


     Not all SAT systems were created equal!
     What are the critical components of the system?
     Design flexibility
     How does the system track?
     Preventative actions, Failure-modes, and
      Corrective actions.



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Critical Components Examples




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Design Flexibility




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How does the system track?

     Electronic controller
              Backtracking
              Wind stow
              Accuracy


     Bearing assembly
              Material
              Wear and tear

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How does the system track?

   AC Motor
          Features
          Motor control
          Failure modes,
           causes, consequences
           and corrective actions




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Preventative Actions, Failure-modes, and
Corrective Actions

     Mostly mechanical system = moving parts
     Possible failures can include:
              Excessive operating load criteria
              Control system failure
              Loss of tracking ability
     Failure-mode and effects analysis (FMEA)


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Quality


     Organization and Quality Assurance Tools
     Manufacturing Processes and Quality
              ISO Certification
              Quality check points
              Performance or stress tests
     Quality Control


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Reliability


     Approach on reliability
     Overview of key failure
      modes
     Reliability Testing
              Critical components
              HALT
              FEM analysis
     Field Experience and
      Lessons Learned
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Supply Chain

    Suppliers
          Selection criteria
          Production monitoring
    Transportation and Logistics
          Where to ship?
          Parts tracking and serialization
    Supply Chain Robustness
          Material substitution and substitution strategies
          Portfolio of vendors for critical parts
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Installation, Operations and Maintenance


     Installation
              Tracker blocks and recommended layouts
              Guidelines
              Site condition requirements or limitations
              Specialized installation equipment requirements
              Construction tolerances




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O&M


     Maintenance activities and frequency
              Scheduled maintenance
              Unscheduled maintenance




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Conclusions


     Not all SATs are created equal
     Research different SAT manufacturers
     Manufacturers field experience
     Design flexibility
     Quality and reliability
     Importance of supply chain
     O&M
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           THANK YOU!


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