The 40% Multi-Color Solar Cell and Soldier Portable Solar Battery Chargers

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The 40 Multi-Color Solar Celland Soldier
Portable Solar Battery Chargers

• Lewis Fraas
• JX Crystals inc
• ARL Portable Power
• Dec. 2010

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Outline

• History of MJ Cells
• Proposed Soldier Portable Solar Battery Charger
• Proposed Schedule
• Progress Status
• Discussion and Conclusions

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32 Efficient InGaP/GaAs/GaSb Line-Focus
Cell-Interconnected Circuits for Satellites
Top Completed InGaP/GaAs/GaSb Circuit
Circuits fit into Middle Circuit with GaSb IR
Cells line-focus receiver Bottom Substrate
with Metal Traces
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NASA Sponsored Outdoor Test of Multi-Color Concent
rator Mini-Module in Texas Shows 30 Conversion
Efficiency
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Over 30 commercial multi-color concentrator
solar cells with

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A concept for a compact solar battery charger.
(a) Shows 12 W Charger in folded 4x8x1 case.
(b) The case is opened showing the folded
lenses.

(a) (b)
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Deployed Solar Battery Charger
The lenses are removed from the case, the lens
legs are folded out and the lenses are inserted
into corner slots. The charger is deployed in the
sun with circuits aligned E and W and the side
legs are swiveled out to the appropriate sun
angle.
JX Crystals Inc Proprietary
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The JXC Engineering Team

• Lewis Fraas PI Design and reporting
• James Avery Cell supply, testing, assist in
  reporting
• Leonid Minkin Plastic Lens and frame design and
  procurement
• Han Xiang Huang Circuit design and fabrication
  Tracker design and fabrication

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12 W Solar Charger Circuit Board Design
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Photos of Small Solar Battery Charger
Four of these units have now been fabricated
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Small Solar Battery Charger Outdoor Test
Data 11.6 W
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Aligned
Realistic Performance as A battery charger At 14 V
Operating Condition Operating Volts Current at 14 V Pmax at 14 V
Well Aligned 230 PM 14 V 0.65 A 9.1 W
Not tracking 250 PM 14 V 0.6 A 8.4 W
Not tracking 20 Minutes later
Measured in Issaquah WA July 23, 2010 DNI Solar
905 W/m2
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Deployed 36 W battery charger.
In folded form, this is about the size of a pad
of writing paper.
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Solar Charger 36 W Circuit Board Design
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36 W Solar Charger Dimensions Table W x L x
H.Closed  235 x 380 x 38 mm (9.25" x 15" x 1.5
")Opened 455 x 380 x 20 mm (17.9" x 15" x
.8")Deployed 455 x 380 x 125 mm (17.9" x 15" x
4.9")
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Status 36 W Solar Charger
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BELOW 75 Watt module deployed and following the
sun highlighting tracking motor and drive screw
ABOVE 75 W module in deployed and tracking
position
JX Crystals Inc Proprietary
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75 W unit viewed from north facing south showing
tracking in early morning (left), at noon
(middle), and in late afternoon (right) as low
power clock motor turns drive screw.
JX Crystals Inc Proprietary
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JXC 75 W Solar back pack unit
Fits inside Navy Seal 3-day Pack
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JXC Tracking 36 W Solar Charger
Size of a Notebook Computer 14.6 x 9.2 x 1.8
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Future JX Crystals 30 TJ LCPV 75 W Backpack
Solar Module vs First Solar 75 W Thin Film Module
(6 x smaller and 3 x lighter at 8 pounds)
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Conclusions

• We have a 2 year ARRA contract to design and
  fabricate small, medium, and larger portable
  TJ-LCPV solar battery chargers.
• We are procuring Fresnel lenses and cells for
  this project. from 3M and Boeing and JXC is
  designing and fabricating these solar battery
  chargers and delivering prototypes to ARL.
• JXC has fabricated four small TJ-LCPV chargers
  and delivered two units to ARL.
• The design of the medium sized charger is
  complete and the first unit has been delivered to
  ARL.
• Delivery of tracking 36 W and 75 W TJ-LCPV
  chargers is scheduled for 2011.