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Photovoltaic Cells

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Photovoltaic Cells By: Charity Henderson & Laura Metzler What are Photovoltaics? Sunlight = Energy Absorb solar energy from the sun Transforms the energy into ... – PowerPoint PPT presentation

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Title: Photovoltaic Cells


1
Photovoltaic Cells
  • By Charity Henderson Laura Metzler

2
What are Photovoltaics?
  • Sunlight Energy
  • Absorb solar energy from the sun
  • Transforms the energy into electricity

3
What Are Photovoltaics Continued (Rochester Solar)
  • Flat Silicon Containing Panels
  • Three Types
  • Poly-Crystalline Micro-crystalline
    Thin film Panel
  • Multiple silicon crystals Single large
    silicon crystal several microns
    thick


  • used for shingles
  • Can be Mounted on Roof, Pole, Or Ground

4
Why Use Photovoltaics?(Rochester Solar)
  • Renewable Energy
  • Uses only the suns energy
  • 2kW system prevents 3,843 lbs of CO2 pollution by
    in one year

5
Why Continued
  • An average 2 kW system can reduce electricity
    consumption in an average house by 30( Nyserda)
  • In Energy Star homes it can be as much as 50(
    Lessord)
  • Use of a 2 kW system can reduce energy costs by
    32 a month (Nyserda)
  • New York State offers tax credits and incentives
    that can reduce cost by 50

6
How do Photovoltaics Work?
  • Consists of 2 sheets of differently coated
    silicon
  • Creates an electrical field in the junction
    between the sheets
  • Upper sheet absorbs photons of light, releasing
    electrons from the silicon (New Zealand PV)

7
How Continued
  • Through contact with the electrical field in the
    junction, the electrons reach the bottom layer of
    silicon and return to the top layer
  • The action creates electric current, which is
    conducted by the metallic contact finger (U of R)

8
How Continued
  • Because the current produced is direct current
    (DC), and most homes and businesses run on
    alternation current (AC), a typical PV system
    also includes a device called an inverter to
    change the power to a useable form.( New Zealand
    PV)
  • Batteries also used to store power not
    immediately being used.
  • PV energy can be sold back to a utility company,
    causing the meter to run backwards

9
Where is PV used?
Three Largest Markets (94 of growth)
  • Germany
  • 137 annual growth rate
  • Japan
  • 22 annual growth rate (maintained)
  • United States
  • 25 annual growth rate
  • (IEA PV)
  • Also Used in Australia, Austria, Canada,
    Denmark, France, Israel, Italy, Republic of
    Korea, Mexico, The Netherlands, Norway, Portugal,
    Sweden, Switzerland, United Kingdom

10
Who is using PV power?
  • Homes
  • Businesses
  • Colleges
  • Rochester Solar Technologies
  • HSBC Bank
  • Westchester Community College
  • SUNY Brockport??

11
Conclusion
  • Photovoltaic Solar Cell technology is a viable
    source of renewable energy.
  • It has already been implemented in homes and
    businesses of many countries.
  • The market for PV is growing annually because
    they are a practical energy alternative.
  • This is a technology that every homeowner can
    look into information is abundant and local.

12
Works Cited
  • IEA Photovoltaic Power Systems Program. Trends in
    Photovoltaic Applications. Available at
    http//www.iea-pvps.org/isr/index.htm
  • University of Rochester. What Are Photovoltaics?.
    Available at http//www.history.rochester.edu/cla
    ss/PV/whatspv.html
  • Lessord, Kara, of Rochester Solar Technologies.
    (Spoken material)
  • New Zealand Photovoltaics. Frequently Asked
    Questions About Photovoltaics. Available at
    http//www.photovoltaics.org.nz/faq.html
  • http//www.nypa.gov/press/2006/061227a.htm
  • Rochester Solar Technologies. Solar Education.
    Available at http//www.rochsolartech.com
  • Solar Electric Energy Pamphlet. NYSERDA.
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