Download - Off-Grid Solar Power System
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Off-Grid Solar Power System
Engineering Service Learning (Engr. 4692.01S)
Zach Dombi, Vincent Mazzone
Bradley “Scott” Valentine, Peter Worley
5/29/2014
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Presentation Topics1. Project Details
a. Backgroundb. Objectives
2. Design a. Processb. Electricalc. Mechanical
3. Post-Trip Resultsa. Issues Encounteredb. Objectives
Achieved/Deliverablesc. Sustainability and
Ownershipd. Cost Analysis
5. Conclusion6. References and
Acknowledgements
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Introduction
Role Team Member Specialization
Team Leader Zach Dombi Electrical
Communication Peter Worley Mechanical
Documentation Scott Valentine Electrical
Financial Vincent Mazzone Chemical
Team Members
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Background Information: Problem
● Model Home○ Stability○ Health○ Living Condition
● Residential Electricity ○ Lights○ Cellphone ○ Television○ Fans○ Refrigerator
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Background Information: Goal● Vocational School Dorm
○ Model home plus wings○ 8 students
● Off-Grid Power○ Grid unreliable○ High rates○ Long term vision
● Wind Power Impractical
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Need● Scope
o Construct pilot off-grid solar system at local home
o Power numerous applianceso 1 day autonomy
● Constraintso $1,400 budgeto Local partso Safetyo Replicable design
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Objectives● Deliverables
o Functioning solar systemo Information and maintenance
packeto On-site testing
Power levels Completed circuit
o Economic Analysis Rate of return
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Design Process1. Determine desired electrical devices2. Determine energy demand 3. Size inverter - max wattage
a. Max wattage4. Determine insolation or sun-hours/day5. Select solar panels
a. 15% inverter lossb. 16% 20 year loss
6. Size batteries - 50% depth7. Determine wire and circuit breakers
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Pre-Trip Electrical Design● Panel 180 W
● Safety box
○ Battery - 105 Ah
○ Charge Controller - 15 A
○ Inverter - 450 W
● Light bulbs with strings
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Pre-Trip Mechanical Design● Pole mount
● Security bolts
● Concrete foundation
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In-Country Implementation● La Bonanza● Rural, impoverished
community● House does not have
its own grid connection
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The House● Living room, kitchen, bedroom● 2 lights, one outlet● Unsafe
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Electrical Box
● Protection from environment
● Child safety● Ventilation
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Mount Frame● Scrap metal● Welded● Bolt panel to frame
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Mount Pole● Two galvanized “canteletas” welded
together● Significantly cheaper than metal pole
○ $40 vs. $100● 13 feet
○ 4 feet in the ground○ 9 feet above the ground
The beams were laid on each other and welded along the seam every few feet on both sides.
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Foundation● 2 foot diameter by 4 feet deep hole● Concrete with rebar● Ingenious Dzwonczyk Collar
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Final Assembly
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Location of Electrical Components within Home
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Electrical Wiring● Four Outlets● Four Light
fixtures● One circuit
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General Wiring Diagram
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Issues Encountered● The amount of cement needed
● Alignment of the bolt holes
o Panel and mounting system
● Securing the wood platforms
● A short in the system
o Grounding error
● The iron
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Objectives Achieved and Deliverables● Six main objectives/goals
● Local parts versus low cost
● Maintenance manual and a day of
education
● Under budget
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Sustainability and Ownership● All major parts bought locally● Minor parts can be purchased in
country ● Aiding in the installation● Education seminar
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Cost AnalysisTotal Cost: $1,177.23
● $1053.80 in Honduras all major solar panel components and other
miscellaneous items● $123.43 in United States
minor items (i.e. screws, outlets, fixtures)
Install Cost Utility Rate(monthly) Most Economical
Grid Connection $143 if < 150 kWh: freeif > 150 kWh: $0.24/kWh
X
Solar System (180 W) $1,177 if <30 kWh: free
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Economic Analysis● If use > 200 kWh/month there is an economic case for solar● WGM compound uses ~ 220 kWh/month● WGM vocational school would use more
Install Cost
Energy Usage
Monthly Bill
Grid Connection $143 200 kWh $48
Solar System (1 kW) $4,500 200 kWh (provides)
0
Install Cost Simple Pay-Back Rate of Return
Solar System (1 kW) $4,500 7.8 years 12.8%
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Non-Economic Analysis● Grid power erratic (frequent power outages)
● Remote villages unable to be grid-tiedo Islandso Hill/mountain sides
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Conclusion
● Achieved goals set by scope of work
● Objectives adjusted while in country to account for new information
● Easily replicable if funds are able to be generated
● Ownership established
● Viable for use in areas with no possibility of grid access in the foreseen
future
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Acknowledgments ● Roger and Mariant● Larry and Angie Overholt and WGM● Engineering Education Innovation Center● Solar Education and Outreach: Jason
Mulligan● Wiring Lab: Mike Lichtensteiger
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References1. http://www.state.gov/e/eb/rls/othr/ics/2012/191162.htm2. https://www.worldcityweb.com/past-events/global-connections/7808-energy-forum-ways-to-cut-energy-costs-in-latin-america3. http://www.siliconsolar.com/off-grid-solar-systems.html4. http://tyconpower.com/products/images/world_insolation_map_04-1250x691%20%281%29.gif
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Questions?