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KXOB22-12X1F

P1-P3P4-P6
IXYS reserves the right to change limits, test conditions and dimensions © 2010 IXYS All rights reserved
IXYS KOREA LTD. 4 IXYS Corporation
A-dong #1106, Uspace 1, 660 Daewangpangyo-ro, 1590 Buckeye Drive, Milpitas,
Bundang-gu, Seongnam-si, Gyeonggi-Do (Korea) CA 95035-7418, United States
Phone +82-70-7113-0300, Fax +82-70-7113-0301 Rev. June. 2016 Phone (408) 457-9000, Fax 408-496-0670
Background
Some basic information needs to be covered to better understand what to expect in terms of
the SolarBITs performance with regards to solar cell type, lighting conditions in terms of
power density, and general industry standards as they relate to battery charging.
Solar Cell Types
Keep in mind these cost and performance tradeoffs when comparing various solar cell
materials:
Polycrystalline cells are commonly found in outdoor applications and have a spectral
sensitivity range of 500nm to 1100nm. They’re in the medium price range and typically offer
a 13% power conversion efficiency.
Monocrystalline cells, such as the IXYS SolarMD, have a spectral sensitivity range from 300
nm (near-ultraviolet) to 1100 nm (near-infrared), which includes visible light (400 to 700 nm).
Due to this wide spectral range, they can be used in both indoor and outdoor applications.
Monocrystalline or single-crystalline material is the most expensive but it does not contain
impurities, and as such the power conversion efficiency does not degrade over operating time.
The power conversion efficiency of commercially available monocrystalline cells ranges from
15 to 22%. The surface of these cells is a homogenous dark blue or dark grey.
Finally, amorphous cells, which work in the spectral range of 300nm to 600nm, are used
predominantly indoors in products such as solar powered calculators since they are not
sensitive to the upper light spectrum and cannot take advantage of natural sunlight. They
offer about 5% power conversion efficiency and are mostly used with ultra low power devices
like clocks and electronic calculators. Amorphous cells, like polycrystalline cells, suffer from
efficiency degradation.
IXYS reserves the right to change limits, test conditions and dimensions © 2010 IXYS All rights reserved
IXYS KOREA LTD. 5 IXYS Corporation
A-dong #1106, Uspace 1, 660 Daewangpangyo-ro, 1590 Buckeye Drive, Milpitas,
Bundang-gu, Seongnam-si, Gyeonggi-Do (Korea) CA 95035-7418, United States
Phone +82-70-7113-0300, Fax +82-70-7113-0301 Rev. June. 2016 Phone (408) 457-9000, Fax 408-496-0670
SolarBit Description
SolarBITs are monocrystalline, high-efficiency solar cells in a surface mount package. They’re
robust and can be used in harsh environments. SolarBITs have a very high (22%) power
conversion efficiency, which means that 22% of the light energy is converted into electrical
energy. They’re extremely useful in applications requiring solar power generation in a limited
space.
Monocrystalline cells can be used in indoor and outdoor applications because they have a wide
spectral sensitivity, 300 to 1100 nm. However, the output power of a solar cell is proportional
(over a wide range) to the incoming light energy, and irradiance is generally much higher
outdoors. The values in the data sheet are measured at “standard condition” of 1 sun, which is
equal to 1000W per square meter sunlight irradiance at a defined light spectrum (air mass of 1.5)
and 25°C cell temperature.
IXYS reserves the right to change limits, test conditions and dimensions © 2010 IXYS All rights reserved
IXYS KOREA LTD. 6 IXYS Corporation
A-dong #1106, Uspace 1, 660 Daewangpangyo-ro, 1590 Buckeye Drive, Milpitas,
Bundang-gu, Seongnam-si, Gyeonggi-Do (Korea) CA 95035-7418, United States
Phone +82-70-7113-0300, Fax +82-70-7113-0301 Rev. June. 2016 Phone (408) 457-9000, Fax 408-496-0670
Relative Lighting Power Density
The figure above compares relative power density for various lighting conditions in units of Watts
per square meter (W/m
2
). The reference standard condition is 1 Sun and is equal to 1000 Watts
per square meter of sunlight irradiance at a constant 25°C cell temperature and at 1.5 Air Mass
(Air Mass stands for a well defined light spectrum which appears if the sunlight goes through the
earth’s athmosphere at a defined angle).
As the chart clearly shows, the power density of typical indoor lighting is dramatically lower than
that of sunlight. Not only is irradiance from indirect and artificial light lower; the spectrum is also
narrower. In typical Office Space lighting with a spectrum produced from incandescent or halogen
light bulbs, the power output may be roughly 100 times less than bright sunlight. It may be 200
to 500 times less with fluorescent lighting due to the further limited spectrum.
IXYS makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication and reserves the
right to make changes to specifications and product descriptions at any time without notice. Neither circuit patent licenses or indemnity are
expressed or implied. Except as set forth in IXYS’ Standard Terms and Conditions of Sale, IXYS assumes no liability whatsoever, and disclaims
any express or implied warranty relating to its products, including, but not limited to, the implied warranty of merchantability, fitness for a particular
purpose, or infringement of any intellectual property right.
The products described in this document are not designed, intended, authorized, or warranted for use as components in systems intended for
surgical implant into the body, or in other applications intended to support or sustain life, or where malfunction of IXYS’ product may result in direct
physical harm, injury, or death to a person or severe property or environmental damage. IXYS reserves the right to discontinue or make changes to
its products at any time without notice.
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KXOB22-12X1F

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