Hybrid Streetlamp Group R
Students:
Team Members
Hunter O’Folan (ME) Karl Johanson (ME) Justin Dao (EE) Zachary Basch (EE)
Mentors: Professor Ting Tan (CE) Professor Tian Xia (EE)
Client: UVM Clean Energy Fund
Purpose • • •
Aesthetically pleasing, solar and wind powered streetlight Self sufficient, no grid connection Light lasts throughout night (at least 8 hours)
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Charge Switching ●
5 possible charging configurations ○ ‘0’ indicates low voltage, ‘1’ indicates high voltage ○ No charging effect if battery is high, regardless of solar and motor
Overcast Day Solar Voltage
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Highest amount of sunlight exposure around midday ● Little to no exposure after sunset
40W, 31” x 14” x 2.6”
LED Lighting System
● 4 LEDs in series per disc ○ 400mA draw per disc ○ Current: 3x400mA =1.2A
● 9 Strip Lights ○ ~100mA draw each ○ Current: 9x100mA = 900 mA
● Total Current: 1.2A + 0.9A = 2.1A
Absorbed Glass Mat Battery ● 12V nominal voltage, 108 Ah capacity ● 2.1A total current draw
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51.43 Hours until battery is drained to lessthan-useful voltage (~10.5V)
● Choose to neglect the current that the microcontroller requires ○
~40mA; very small in comparison to LEDs
● With mediocre charging days, battery can easily satisfy the 8 hour requirement
Voltage (V)
24 Hour Battery Monitor
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24-Hour Time Constant discharge after ~8pm Solar charges the battery quickly in the morning, caps at 12.6V Solar panel alone allows the system to be self sufficient
Airfoil Construction.1 3D Print
-The Airfoils were designed to use minimum material, and maintain shape in near vacuum pressure pump. -Dovetail like joints allow two halves to become whole.
Airfoil Construction.2 Bamboo Sheathing Test Run: 3 layers of . 6mm Bamboo Veneer Bonded with PVA wood glue, vacuum pressed around core.
Final Blade: Full length helical airfoil produced. 3 blades produced, 2 layers of Ecopoxy.
Blade holders, Bamboo arms, and Cable Tensioning.1
21” Helical airfoil with 360 lb aircraft cable running through it and bamboo arms.
ABS blade holders 3D printed
6.25” Bamboo arms
Carbon Fiber tube with Spring connecting both ends of aircraft cable
Slip Ring.1 Design
Total Assembly Cross Section
Inner part rotates. Outer is stationary. Brushes not shown.
Slip Ring.2 Fabrication
Inner Rotating ring. To the left is the rest of the wind turbine. Copper rings contact brushes.
Stationary part. Electric potential transferred through the brushes to lights on wind turbine.
Light Fixture half a fixture:
Aluminum Housing.1
Exploded View
Assembled. Wind Turbine extends up out of top. Motor and long aluminum pole below.
Battery and Micro-Controller Housing -Bulkhead Fitting Battery and board kept secure from external variables using professional-grade Pelican case. For our prototype, the case sits adjacent to the pole. A more finalized design will have all electrical components housed in the base of the pole. All wiring is internal (within pole).
Full system
Water Proofing - silicon - polycarbonate
Objectives Met
- Self sufficient - Aesthetically pleasing - Last eight hours
Looking Forward - Improved turbine - Ease of maintenance - Base structure - Renewable materials
We would like to thank the Clean Energy Fund for making this project possible. The goal of the Clean Energy Fund is to advance research and educational opportunities in the field of renewable energy through independent student projects. With the development of new clean energy technologies, we will strive to improve energy usage around the world. Our project is just one example of a common device that can be modified to be less dependent on non-renewable resources.
Questions?