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Inverter and BOS Development Performing Organization: Sandia National Laboratories (SNL) Key Technical Contact: Ward Bower, 505-844-5206, wibower@sandia.gov. DOE HQ Technology Manager: Dan Ton, 202-586-4618, dan.ton@ ee.doe.gov FY 2005 Budget: $1,643K ____________________________________________________________________________________ Objectives • Improve inverters and balance of systems (BOS) through the High-Reliability Inverter Initiative (HRII) for PV, to include: ○ Mean time between failure (MTBF) of >10 years ○ Inverter efficiency >94% ○ Inverter cost less than $0.90/watt ○ Meet Underwriters Laboratories UL 1741 certification requirements ○ Meet FCC Part 15, Class B for electromagnetic emanations requirements ○ Meet National Electrical Code (NEC®) requirements ○ Design for high-volume (>10,000/yr) production ○ Provide modularity and expandability to function with other distributed energy resources. • Improve and establish inverter and BOS designs that allow full-system integration while maintaining flexibility. • Influence codes, standards, and certifications through development, validation, and verification. • Establish the groundwork for a high-tech R&D strategy with 20-year MTBF inverter/system- integrated inverter and BOS goals. Accomplishments • Completed Phase II of the HRII with hardware deliverables from GE and Xantrex. • Continued the HRII with a Phase II+ no-cost work bridge. • Continued the HRII Phase III with GE and Xantrex. • Assessed alpha inverter and controller prototypes for conformity to utility interconnection requirements, performance objectives, and manufacturing objectives. • Conducted verification and validation of prototypes, through laboratory evaluations, review of highly accelerated life testing (HALT®), environmental testing, and performance. • Initiated “High-Tech Inverter, Balance-of-System, and Systems R&D” with a FedBizOps announcement and draft of a request for proposal to begin the project. • Developed an innovative high-reliability micro-inverter topology eliminating short-life components. Future Directions • Complete HRII Phase III with GE and Xantrex with focus on commercial-quality inverters. • Conduct high-tech R&D for inverters, BOS, and systems strategies. • Focus on inverter and BOS developments and strategies to facilitate building-integrated and vertically integrated systems designs. ____________________________________________________________________________________ 1. Introduction Inverters for PV systems are much more than just the power electronics to convert the DC power from PV arrays to load-compatible AC power. They are actually the power conversion devices surrounded by, and integrated into, total system controls. Given the number of functions the 65 inverter must perform today, much improved reliability, higher performance, and lower costs are essential. Higher quality inverters even at constant costs can very positively, and with a very high level of probability, reduce the levelized cost of energy (LCOE) of installed PV systems, as indicated in new prediction models (such as PV DesignPro and PVSAM) being developed within Photovoltaic R&D Advanced Materials and DevicesPDF Image | DOE Solar Energy Technologies Program
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