eBook Solar Panel Design-1

8/3/2019 eBook Solar Panel Design-1

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Design (Component Name)

HOKIESAT DESIGN OF

SOLAR PANELSDocument Authors:

Brian Shepard [email protected]

Virginia Polytechnic Institute and State UniversityAerospace and Ocean Engineering

215 Randolph HallBlacksburg, VA 24060

Last Updated: 04/29/02 07:45 AM

Document Number: (To be assigned by Ann, Jana or Scott)Revision Number: 1

Version #??? Date (MM/DD/YY) 1/15


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Revision History

Revision Description Author / Date Reviewer / Date Systems / Date

1 Initial Fill-in of Temp. Brian S. 4/172 More fill-in Brian S. 4/29



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Table of Contents

HOKIESAT DESIGN OF...................................................................................................1

SOLAR PANELS...............................................................................................................1

Revision History.................................................................................................................2

Table of Contents................................................................................................................3

List of Figures.....................................................................................................................5

List of Tables......................................................................................................................5

List of Abbreviations..........................................................................................................6

Other Related Documentation.............................................................................................6

1.0 Introduction....................................................................................................................8

1.1 Solar Cell....................................................................................................................8

1.2 Solar Cell String.......................................................................................................10

1.3 Solar Cell Panel 1.....................................................................................................10

1.4 Solar Cell Panel 2.....................................................................................................11

1.5 Solar Cell Panel 3.....................................................................................................11

1.6 Solar Cell Panel 4.....................................................................................................12

1.7 Solar Cell Panel 5.....................................................................................................13

1.8 Solar Cell Panel 6.....................................................................................................13

1.8 Solar Cell Zenith Panel.............................................................................................14

2.0 Miscellaneous..............................................................................................................15

3.0 References....................................................................................................................15



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4.0 Appendix......................................................................................................................15



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List of Figures

List of Tables



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List of AbbreviationsNONE

Other Related DocumentationDocument Name Document Number Document location



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1.0Introduction

The solar panels are associated with the Power subsystem because the solar cells

mounted on these panels will convert sunlight into electricity and help power HokieSat.

Each solar panel will contain an array of solar cells that is made up of several soldered

strings. At the end and in between of each string will be wires that lead either to another

string or the inside of the satellite. All eight solar panels (six sides, one top, one bottom)

were designed individually to accommodate the uniqueness of each surface. This

included maximizing the number of solar cells on each surface and at the same time

avoiding other physical features.

1.1 Solar Cell

The solar cells used on HokieSat are GaInP2/GaAs/Ge high efficiency (22.6%)

cascade solar cells by TECSTAR. The approximate mass of each cell is 3.07 grams.

Figure 1.1.2 shows specifications of each cell1. Figure 1.1.1 shows a dimensioned

drawing of the cell, and figure 1.1.3 shows a 3-D picture of an individual cell1

.



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Figure 1.1.1- Dimensioned Solar Cell

Figure 1.1.2- Solar Cell Specifications

Figure 1.1.3- 3-D Picture of Individual Cell


Specifications Value

Length 2.497 in

Width 1.522 inCell Size

Thickness 0.0063 in

Length 0.383 inInterconnect

Width 0.09 in

Length 2.2 inTermination

Width 0.1 in

Length 2.497 inWidth 1.522 in

A/R

CoverglassThickness 0.004 in

By-pass diode voltage drop 0.6 V

Vopen circuit @ 28 C 2.47 V

Vmax power @ 28 C 2.1 V

Ishort circuit @ 28 C 370 mA

Imax power @ 28 C 350 mA

Cff @ 28 C 82 %

Efficiency 22.6 %

Mass (g) 3.10

Absorptivity 0.91

Emissivity 0.88


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Each solar cell is a combination of the cell, a cover glass over the cell, interconnects, and

end terminations.

1.2 Solar Cell String

Panels 16 have two strings of 12 solar cells, and the top panel has one string of 12

solar cells. A string is connected in series by either soldering the cells together or

soldering a wire (22 gauge) between two cells. More detail is discussed in the assembly

procedure.

1.3 Solar Cell Panel 1

Solar Panel 1 is shown in figure 1.3.1. Dimensions of the location of the different

strings are also shown. Primary concerns when designing this panel were working

around the irregular top side, placing around the patch antenna, placing around the

external connector, and spacing the cells for optimum distance between cells.

Figure 1.3.1- Panel 1



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strings are also shown. The primary concerns when designing this panel were working

around the camera hole and spacing the cells for optimum distance between cells.





around the thruster hole and spacing the cells for optimum distance between cells.



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around the thruster hole, camera hole, irregular top side, and spacing the cells for

optimum distance between cells.




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around the thruster hole and spacing the cells for optimum distance between cells.





around the thruster hole, camera hole, irregular top side, and spacing the cells for

optimum distance between cells.



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1.8 Solar Cell Zenith Panel

The zenith solar panel is shown in figure 1.9.1. Not many dimensions were needed

for this panel. It had been decided that three sections of four cells would be placed where

it was most convenient. The primary concern when designing this side was finding the

ideal distance between cells.

Figure 1.9.1- Zenith Panel



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2.0Miscellaneous

(WILL ADD SOMETHING HERE IF I CAN THINK OF IT)

3.0References

1. Taken from USU power documentation.

4.0Appendix

(DO I NEED SOMETHING HERE?)


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