Day4 Energy's Proprietary Module Technology Paves the Way for Metallurgical Silicon Solar Cells



    Day4 Electrode with Integrated Shading Protection Maximizes Long-Term
    Performance of UMG PV Cells

    BURNABY, BC, Aug. 7 /CNW/ - Day4 Energy Inc. (TSX: DFE), a leading
manufacturer of high performance, cost-effective solar electric modules,
announced today that it has successfully developed and tested a proprietary PV
module technology specifically designed for application with solar cells based
on Upgraded Metallurgical Grade (UMG) silicon material. Once commercialized,
UMG silicon technologies are widely believed to become a viable source of low
cost alternative silicon material for solar industry. However, UMG silicon
processing presents a number of technical challenges across the industry's
value chain. Day4's proprietary technology is designed to address specific
requirements of UMG silicon based solar cells and is expected to offer
significant cost reduction potential for solar power generation.
    The company has used its proprietary Day4 Electrode and distributed
by-pass diode technologies to integrate shading protection directly into the
solar cells as opposed to the traditional approach that calls for by-pass
diodes placed in the centralized junction box area on the back of the solar
module. Due to the inherent flexibility of Day4 Electrode integrated by-pass
diode technology, shading protection can now be distributed through-out the
solar module reducing product sensitivity to changing solar illumination
conditions and partial solar module shading in particular. While the
technology is certainly applicable to all types of PV cells it is particularly
relevant for UMG silicon based solar cells as it addresses one of the key
issues of commercial UMG silicon based solar modules - increased sensitivity
and potential danger to PV module integrity at the time of partial module
shading when compared to conventional crystalline silicon solar module
technology.
    "It is known that UMG based solar cells typically have substancially
lower shunt resistance and a corresponding lower value of breakdown voltage
compared to conventional solar grade multicrystalline solar cells. This fact
imposes a limitation on the maximum number of solar cells that can be
connected in series in the solar module in order to prevent irreversible
breakdown in case of partial module shading during operation." says Professor
Leonid Rubin, chief technology officer of Day4 Energy. "Our low cost
integrated Day4 Electrode by-pass diode technology eliminates this problem and
removes some of the existing prejudice against wider employment of this
potentially prospective material."
    UMG silicon technology for manufacturing silicon ingots and wafers is
widely believed to offer significant potential for cost reduction for the PV
industry as a whole. With recent progress made by a number of companies at the
silicon purification level, UMG silicon material is starting to make its way
into the PV cell production lines. At the same time, PV module technology
requires its share of modifications in order to successfully utilize these new
UMG silicon based PV cells without jeopardizing the long-term integrity of the
final product. Day4's new technology addresses these issues and removes one of
the key roadblocks on the way to implementation of UMG silicon solar cells in
large-scale commercial solar module manufacturing. The technology is
ultimately enabled by a combination of the company's proprietary Day4
Electrode technology for contacting and interconnecting solar cells with a
proprietary low cost by-pass diode design. The company has applied for patent
protection in connection with this invention.

    About Day4 Energy:

    Headquartered near Vancouver, British Columbia, Day4 Energy Inc. (TSX:
DFE) designs, manufactures and sells photovoltaic (PV) modules based on its
patented Day4 Electrode technology, a proprietary method of contacting and
interconnecting solar cells that produces PV panels of high power density,
increased lifetime and uncompromised aesthetic appearance. Day4 Energy
partners with the industry's leading PV cell producers to deliver IEC- and
UL-certified commercial and residential solar products to customers throughout
Europe and North America.
    www.day4energy.com





For further information:

For further information: Press Contact: Rosalind Jackson, Antenna Group
(for Day4 Energy), (415) 977-1923, rosalind@antennagroup.com; Investor
Contact: Cory Pala, (416) 657-2400, CPala@Day4Energy.com

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