DOE Solar Energy Technologies Program

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Summary of FY 2005 Results inverter development into its existing new construction housing market. 4. Planned FY 2006 Activities Activities planned for FY 2006 follow a natural progression of improving designs to an acceptable reliability level, focusing on further improvement to a required level for inverters and BOS of at least a 20-year MTBF, and then fully integrating components that allow the complete system to have the same lifetime as the PV modules (now typically 30 years) and to optimize the performance of the systems through factory assembled and vertically designed and integrated systems. The “High-Tech Inverter, Balance-of- System, and Systems R&D: A 5-Year Strategy” project will be used to bring U.S. PV technologies to the forefront. The proposed milestones include: • Completing the HRII Phase III • Initiating the high-tech R&D strategies with integration into module manufacturing • Conducting the “conceptual design” (first phase for high-tech R&D) • Organizing a Systems-Driven Approach workshop for vertically integrated inverters, BOS, systems. Continuing micro-inverter development with funding and collaboration through PV module manufacturers. 5. Major FY 2005 Publications High Reliability Photovoltaic Inverter – Phase II Final Report (GE Proprietary), Deliverable D16.1, Proprietary Report to Sandia National Laboratories, SNL Contract Number 55792, General Electric Global, Dec 15, 2004. High Reliability Photovoltaic Inverter – Phase II Final Technical Progress Report, Releasable Report to Sandia National Laboratories, SNL Contract Number 55792, General Electric Global, Dec 15, 2004. High Reliability Inverter, Phase II Final Technical Progress Report, Report to Sandia National Laboratories, SNL Contract Number 54110, Xantrex Technologies, Dec 15, 2004. Draft Final Report Highly Reliable Photovoltaic Inverter (Detailed Proprietary), Prepared by: Dr. Leo Casey, Principal Investigator, SNL Contract Number 54099, SatCon Technology Corporation, Feb 22, 2005. Photovoltaic R&D Advanced Materials and Devices Milestone or Deliverable Sponsor High-Tech Inverter R&D Workshop. Due Status Date 10/31/ Completed on 04 time. Finalize development of new prototype design, with emphasis on switching technologies and switching devices; manufacturing processes and packaging technologies to be developed; cooling technologies and operating temperatures; surge suppression designs; and physical characteristics. Complete Phase II with delivery of prototype inverters and Phase II reports. 12/31/ 04 Two contractors completed work on time with prototypes delivered. Report on High-Tech Inverter R&D Workshop. 02/28/ Completed on 05 time. Complete no-cost extension of Phase II to bridge contracts and keep R&D teams intact during the Phase II evaluation period and determination of funding resources. 03/31/ 05 Completed on time. Validate the prototypes meeting the utility interconnection requirements and compliance with regulating standards (IEEE 1547, IEEE 519, and UL1741). 04/30/ 05 Completed. Two manufacturers provided prototypes on time. Deliver commercial quality high- reliability (>10 year) inverters to SNL. 09/30/ 05 Work delays due to funding delays. New dates extend to 12/06. Draft document for High-Tech Inverter, BOS and Systems R&D Strategies. Provide manufacturer feedback and complete summary report to discuss impacts on the PV program and systems. 02/28/ Completed on 05 time. In process, 08/31/ work delayed 05 due to funding delays. Assess, test, and validate high- reliability inverter prototypes with characterization and evaluation and determinations of effectiveness of cooling technology at SNL. 02/28/ 05 Completed on time with two validation iterations for each. Draft call for request for proposal for High-Tech Inverter and BOS R&D Strategies. 09/30/ 05 Announce- ment made on time with request for proposal in process. Both General Electric and Xantrex are currently active in Phase III of the High-Reliability Inverter Initiative and have extensive and critically timed commercialization plans for the products developed out of this program. Xantrex expects to use the fundamental high-reliability design as a basis for its next-generation family of products. GE is vertically integrating its newly acquired PV module-manufacturing capabilities with the new 69

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