[1]. [7] constraintsdescription power requirementsthe solar panel must be coupled with a battery to...
TRANSCRIPT
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Bully Power Station
Mid-Semester Presentation
March 6, 2014
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Team Members
Lesley Brown
Electrical Engineer
- Hardware Fabrication
- Hardware Design
Mardreagus Williams
Electrical Engineer-Electrical Subsystem
Design
- Hardware Design
Stephen Shambra
Computer Engineer
- Network Implementation
- GUI Development
Graciela Perez
Computer Engineer
- Website Design
- Software and Hardware Design
Dr. Michael S. Mazzola, P.E.
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Outline
Problem Solution Constraints
Technical
Practical
System Overview Approach Progress Timeline
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Problem
There is a need for charging personal electronic devices in locations where typical 120VAC electrical outlets or USB ports are unavailable. common areas on school campuses
public recreational sites
outside concerts or sporting events
A secure means to charge a personal electronic device unattended.
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Solution
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The Bully Power Station will provide a secure and affordable off-grid renewable energy charging source for personal electronics.
Jack Hatcher Chair in Engineering Entrepreneurship
Entrepreneurship Center Advisory Board (ECAB)
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Technical Constraints
Constraints Description
Power Requirements The solar panel must be coupled with a battery to function during night time usage and instances or periods without adequate sunlight.
Battery Protection The battery must be protected from deeply discharging and overcharging according to predetermined specifications provided by the manufacturer
Output Power The unit must be able to output a range of power from 10W to 40W. Up to 5A combined.
User Interface The user interface must display when charging station has power available, the user’s remaining charge time, and whether the station is in normal operation or a low power state.
Secure Enclosure The charging station must provide a secure weatherproof enclosure for users to leave a device unattended while charging
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Practical Constraints
Category Name Description
Environmental Weatherproofing Charging station must be able to operate in areas where precipitation is likely to occur.
Health and Safety
Protection Wires must be properly insulated and the battery must be inside an enclosure.
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Practical Constraints
Environmental
The housing of the charging station electronic modules and battery must prohibit entry of water from precipitation as impurities in rainwater may corrode and damage components.
Must be able to withstand up to 100 MPH winds.
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Practical Constraints
Health and Safety
All wires in unit must be insulated to avoid shock to users.
A NEMA (National Electrical Manufacturers Association) enclosure must be present in design to mitigate incidents involving battery or battery fluid (i.e. battery fluid leak, battery explosion).
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Solar Panel
Charge Controller
BatteryDC Power
DC/AC Inverter
AC Power
Microcontroller
User Interface
Databas
e
System Overview
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Approach
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Approach - Solar Panel TypePros Cons Selecti
on
Monocrystalline
• 10% - 20% More efficient
• Perform better under low intensity sun light
• More tolerant to heat
• Cost :$165
Polycrystalline
• Just as reliable as Monocrystalline panels
• Cost $125
• Less Efficient • Absorbs less
sunlight
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Approach - Lead Acid Battery TypePros Cons Selecti
on
Flooded • Offers a higher discharge rate
• Constant deep discharging
• Requires ventilation• Requires
maintenance
AGM (Absorbed Glass Mat)
• Maintenance free• Longer life span• Operation temperature
ranges
• Doesn’t perform well when constantly deep discharging
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Approach - Charger ControllerPros Cons Selecti
on
Pulse Width Modulation(PWM)
• Inexpensive: $30• Help in extending battery’s
life• Cost efficient for smaller
systems
• Peak operation with full battery
• Solar panel & battery voltages must match
Maximum Power Point Tracker(MPPT)
• Operation temperature ranges
• Offer a higher rate of charge• Cost efficient for larger
systems
• Price: $115
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Approach - Microcontroller Type
Pros Cons Selection
Arduino Mega
• ATmega 2560• Digital and Analog
Pins• Based on C/C++• Cost: $25
• 8 KB SRAM • No network
capability• Wi-fi Shield
($80)
Raspberry Pi • ARM microprocessor core
• USB outputs• Video outputs• Network capability• Python
• Higher Power Consumption
• Only digital pins• Cost: $35
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Approach - Analog Measurements
Atmega328
• Operating voltage is 1.8 to 5.5
• Cheaper than purchasing 3 Analog to Digital Converters
• Easy to program
• Dedicated for low level functions
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(Atmega328 and Raspberry Pi interaction)
Progress
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(Atmega328 and Raspberry Pi interaction)
Progress
Atmega328 Output
Raspberry Pi Output
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Progress (single pole double throw relay)
ON OFF
OFF ON
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Timeline
January
•Research
February
•Research (Jack Hatcher Endowment And ECAB)
•Order Parts
•Develop Code
March
•Order Remaining Parts
•Construct Prototype And Test Subsystems
April
•Finalize Coding, Testing, And Constructing
•Finished Prototype
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Sources[1] (2014, February 23). “Solar Sprout” [Online]
Available: http://www.dreamstime.com/stock-images-concept-solar-panel-green-energy-image14098504
[2] (2014, February 23). “MPPT and PWM Controllers” [Online]
Available: http://solar.altestore.com/search?w=controller&view=grid&x=0&y=0
[3] (2014, February 23). “Deep Cycle Batteries” [Online]
Available: http://solar.altestore.com/search?w=battery&view=grid&x=0&y=0
[4] (2014, February 23). “Solar Panels” [Online]
Available: http://solar.altestore.com/search?w=solar+panel&view=grid&x=0&y=0
[5] (2014, February 23). “Arduino Mega Development Board” [Online]
Available: http://evolutiontoys.com/arduino-mega-atmega-128016au-p-216.html
[6] (2014, February 23). “Raspberry Pi Development Board” [Online]
Available: https://www.modmypi.com/raspberry-pi-model-a
[7] (2014, February 24). “Security Lock Boxes” [Online]
Available: http://www.cdw.com/shop/products/Black-Box-Security-Lockbox-rack-lock-box-3U/2079412.aspx
[8] (2014, March 3). “Battery Clipart” [Online]
Available http://www.clker.com/clipart-146793.html
[9] (2014, March 3). “Smartphone Clipart” [Online]
Available: http://www.clipartlord.com/category/home-clip-art/appliances-clip-art/mobile-phones-clip-art/smartphone-clip-art/
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Bully Power Station
Mid-Semester Presentation
March 6, 2014
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