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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 Topics 1.Project Details a.Background b.Objectives 2.Design a.Process b.Electrical c.Mechanical 3.Post-Trip Results a.Issues Encountered b.Objectives Achieved/Deliverables c.Sustainability and Ownership d.Cost Analysis 5.Conclusion 6.References and Acknowledgements

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Introduction RoleTeam MemberSpecialization Team LeaderZach DombiElectrical CommunicationPeter WorleyMechanical DocumentationScott ValentineElectrical FinancialVincent MazzoneChemical 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 appliances o 1 day autonomy Constraints o $1,400 budget o Local parts o Safety o Replicable design

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Objectives Deliverables o Functioning solar system o Information and maintenance packet o On-site testing Power levels Completed circuit o Economic Analysis Rate of return

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Design Process 1.Determine desired electrical devices 2.Determine energy demand 3.Size inverter - max wattage a.Max wattage 4.Determine insolation or sun-hours/day 5.Select solar panels a.15% inverter loss b.16% 20 year loss 6.Size batteries - 50% depth 7.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 Analysis Total 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 CostUtility Rate(monthly)Most Economical Grid Connection$143if < 150 kWh: free if > 150 kWh: $0.24/kWh X Solar System (180 W)$1,177if

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$143200 kWh$48 Solar System (1 kW)$4,500200 kWh (provides) 0 Install CostSimple Pay-BackRate of Return Solar System (1 kW)$4,5007.8 years12.8%

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Non-Economic Analysis Grid power erratic (frequent power outages) Remote villages unable to be grid-tied o Islands o 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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References 1. http://www.state.gov/e/eb/rls/othr/ics/2012/191162.htmhttp://www.state.gov/e/eb/rls/othr/ics/2012/191162.htm 2. https://www.worldcityweb.com/past-events/global-connections/7808-energy-forum-ways-to-cut-energy-costs-in-latin-americahttps://www.worldcityweb.com/past-events/global-connections/7808-energy-forum-ways-to-cut-energy-costs-in-latin-america 3. http://www.siliconsolar.com/off-grid-solar-systems.htmlhttp://www.siliconsolar.com/off-grid-solar-systems.html 4. http://tyconpower.com/products/images/world_insolation_map_04-1250x691%20%281%29.gifhttp://tyconpower.com/products/images/world_insolation_map_04-1250x691%20%281%29.gif

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Questions?