NCPV preprints for the 2. world conference on photovoltaic solar energy conversion Page: 82 of 144
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A third company in this group, PowerLight Corporation,
plans a 3-year program to accomplish enhancements to
their PowerGuardR product, a light weight, electrically
active roof tile that can be mounted without roof
penetrations in most applications. PowerLight plans
advances in manufacturing to reduce cost, increase
capabilities, and provide PV systems incorporating
financing options. PowerLight expects to demonstrate
system costs of $3.05/W and to complete improvements in
PowerGuardR tile fabrication manufacturing to achieve a
production capacity of 16 MW/yr. The products will be
produced to meet UL and international requirements, and
integrated warranties will be developed. Commercial
demonstrations of the modified PowerGuardR systems will
be evaluated each year. In addition, PowerLight is
working with Trace Technologies (a sister conipany to
Trace Engineering) to upgrade the control board for their
grid-tied inverter. Advancements include redesigning the
controller for PV-specific applications, adding an
integrated data-acquisition system, and establishing
communications for audit-worthy verification of PV
system performance. The improvements will apply to a
complete line of Trace Technologies' advanced inverter
products from 25 to 300 kW.
UPGI plans to reduce the total installed cost and
increase the reliability of residential roof-top-mounted PV
systems and meet market requirements for a U-I PV system
with storage. Through a range of integrating steps, UPGI
plans to achieve a 30% reduction in total non-module-
related system costs. The fully integrated system will
incorporate roof-top PV modules, a 4- to 6-kW power unit
and an optional battery storage unit. Power-conditioning
components will be designed to support a variety of
laminates, including the Siemens and Evergreen crystalline
silicon, and Solarex amorphous-silicon products. The
system will conform to applicable standards, building and
seismic codes, and be adaptable to a wide range of roof
materials for both new and retrofit applications. The
results will be demonstrated through a pilot production run
and beta-testing at a variety of locations.
The system and component manufacturing
advancements accomplished to date have resulted in
improved reliability and greater variety of integrated U.S.
PV products. Manufacturers report they are now
producing more versatile products that are easier and less
expensive to build, with demonstrated reliability,
simplified commissioning and ready serviceability.
Advanced systems range in size from 260 Wac to 15
kWac, and advanced inverter products range from 250
Wac to 100 kWac. Products and systems resulting from
this project are now in use.
This work is supported under DOE Contract Number
AC36-83CH10093 with NREL, a national laboratory
managed by Midwest Research Institute and Contract DE-
AC04-94AL8500 with SNL, managed by Lockheed Martin
Company. The authors wish to thank Paul Schissel for
serving on the contract monitoring team for the Evergreen
subcontract. Many people have contributed to developing
and implementing the Photovoltaic Manufacturing
Technology project and to the R&D efforts carried out in
this program. The authors acknowledge that this paper
represents their work.
 C.E. Witt, L.O. Herwig, R. Mitchell, and G.D.
Mooney, "Status of the Photovoltaic Manufacturing
Technology (PVMaT) Project," Proceedings of the
22nd IEEE Photovoltaics Specialists Conference, Las
Vegas, Nevada, October, 1991.
 C.E. Witt, L.O. Herwig, R.L. Mitchell, H.P. Thomas,
R. Sellers, and D.S. Ruby, "Recent Progress in the
Photovoltaic Manufacturing Technology Project
(PVMaT)," Proceedings of the 1st World Conference
on Photovoltaics, Waikoloa, Hawaii, December,
 R.L. Mitchell, C.E. Witt, H.P. Thomas, D.S. Ruby, R.
King, and C.C. Aldrich, "Progress Update on the
U.S. Photovoltaic Manufacturing Technology
Project," Proceedings of the 26th IEEE Photovoltaics
Specialists Conference, Anaheim, CA, September,
 W. I. Bower, H. P. Thomas, B. Kroposki, R. Bonn,
and T. Hund, "Balance-of-System Improvements for
Photovoltaic Applications Resulting from the PVMaT
Phase 4A1 Program," Proceedings of the 26th IEEE
Photovoltaics Specialists Conference, Anaheim, CA,
 M. Russell, C. Handleman, and G. Kern,
"Manufacture of an AC Photovoltaic Module,
PVMaT Annual Technical Report, August, 1995 -
August 1996," NREL, Golden, CO, NREL/SR-520-
23002, August, 1997.*
 S. Strong, J. Wohlgemuth, and M. Kaelin,
"Development of Standardized, Low-Cost AC PV
Systems, PVMaT Annual Report, September 1995-
November 1996," NREL, Golden, CO, NREL/SR-
520-23432, June, 1997.*
 T. Lambarski and G. Minyard, "Design, Fabrication,
and Certification of Advanced Modular PV Power
Systems, Final Report," NREL, Golden, CO,
NREL/SR-520-24921, June, 1998.*
 M. Stern, R. West, G. Fourer, W. Whalen, M. Loo,
and G. Duran, "Development of a Low Cost
Integrated 20 kW AC Solar Tracking Sub-Array for
Grid-Connected PV Power System Applications,
PVMaT Final Report," NREL, Golden, CO,
NREL/SR-520-24759, June 1998.*
 A. Wesley, and R. Wills, "Next-Generation Three-
Phase Inverters, PVMaT Phase I Annual Report,"
NREL, Golden, CO, NREL/SR-520-23330, July
 D. Porter, H. Meyer, and W. Leang, "Three-Phase
Power Conversion for Utility Interconnected PV
Applications, PVMaT Annual Technical Report,
October 1995 - April 1997," NREL, Golden, CO,
NREL/SR-520-24095, February 1998.*
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NCPV preprints for the 2. world conference on photovoltaic solar energy conversion, article, September 1, 1998; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc707815/m1/82/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.