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Pv presentation fsec

  1. 1. Photovoltaics Using the sun to generate electricity 1
  2. 2. An increasingly popular use of solar energy involves solar electric systems, called photovoltaics.Photovoltaic (PV) systems convert sunlight directly into electricity, and are potentially one of the most useful of the renewable energy technologies. 2
  3. 3. On a planet where more than two billion people have no access to electricity, PV systems can provide power for many uses. 3
  4. 4. The heart of a photovoltaic system is a solid-state device called a solar cell. 4
  5. 5. Groups of solar cells can be packaged intomodules, panels and arrays to provide useful output voltages and currents to provide a specific power output. 5
  6. 6. Photovoltaic power is ideal for remote applicationswhere other power sources are impractical orunavailable, such as in the Swiss Alps. 6
  7. 7. This mountain hut in a very remote areaof France uses PV to generate power. 7
  8. 8. Here is a lighthouse along the coast of Eritrea inAfrica. Before this PV system was installed, theLighthouse relied on bottled gas for power – a systemthat required constant maintenance and a permanentstaff on site. 8
  9. 9. Here is a stand-alone PV system in Oix, La Garrotxa in ruralSpain. This system consists of a 900-watt PV array withinverter and batteries. More than 60 rural homes in thismountainous area have been electrified with PV. 9
  10. 10. PV power for off-shore navigational aidseliminates trips to and from shore to refill generators with fossil fuels. 10
  11. 11. Solar-powered water pumps are very efficient andcost-effective in agricultural applications like this system in Kansas. 11
  12. 12. Another farm application – keeping animals wherethey belong, behind PV-electrified fence chargers. 12
  13. 13. PV-poweredstreetlights like thesein a rural town inCentral America helpcontribute to thesafety, security andgeneral standard ofliving in remote areasall over the world. 13
  14. 14. The lamp in this PV- powered insect- trap comes on automatically after sunset. It attracts insects which collide with the metal grid and drop into the receiver below. 14
  15. 15. PV applicationsinclude lighting forremote signs likethis outdoor boardalong a U.S.highway. 15
  16. 16. Off-shore navigationalaids, which requirelittle maintenance, canwithstand harshstorms, and cut downon the cost andpollution of batteryreplacement anddisposal by using PVfor power. 16
  17. 17. Highway directional signs can use PV systems tosave the expense of excavation to extend electriclights to the sign as well as the cost of maintaining the electric line. 17
  18. 18. PV is an excellentsource of power forbattery chargers forboats, vehicles, andequipment. The solar-powered chargerassures that thebattery is chargedand ready for use,even if the boat orvehicle has sat for along time and thebattery hasdischarged. 18
  19. 19. Campers can use PV in remote areas to provide power for lighting, appliances and other uses. 19
  20. 20. It is estimated that more than 15,000 homes in remote parts of the U.S. rely on PV systems to meet their energy needs. In many cases, it is more cost-effective to install a PV system than pay the costs of having the utility company extend the power lines to the home. 20
  21. 21. Many utility companies in the U.S. are turning tolarge PV systems to help meet peak power demandand reduce the need for building new power plants. 21
  22. 22. Around the world, there are many dramatic examples of PV systems. They include this PV-wind-diesel hybrid system inMexico that provides village-wide power for 43 homes, three schools, two stores, a church and an auditorium. 22
  23. 23. In 1987, the Swiss government started a program to mount PV arrays on a sound barrier along a main motorway. 23
  24. 24. This billboard in Mexico promotes a project that uses solar power to electrify streetlights. 24
  25. 25. This photovoltaic system in the Philippines not onlyprovides electricity to the home, but also creates a shelter for this motorcycle. 25
  26. 26. PV modules are used in this remote area in Africa north ofNairobi at the Kenya Gliding Club to charge batteries in VHFradios in gliders, to maintain the starter battery in the tow vehicle which moves the gliders around the airstrip, and to power other instruments. 26
  27. 27. Maybe no uses areas dramatic andimportant as theportable PV panelsand smallrefrigeratorscarried aroundAfrica on thebacks of camels. 27
  28. 28. Refrigerators likethis, carried on thebacks of camels andpowered by PV panels,allow vaccines to bekept in good conditionand transported toremote villages wheremedicines are needed. 28
  29. 29. This is theentrance sign at aWisconsin statepark. The PVsystem powerslights that operatefrom dusk to dawn. 29
  30. 30. This restroom PV lighting system at a state park has exterior amber LED lights, interior white LED lights, and a fluorescent light in a storeroom. 30
  31. 31. A PV-poweredpolice car inZermatt,Switzerland. Onlyelectric, solar-powered, or horse-drawn vehicles areallowed in thisquaint town in theAlps. 31
  32. 32. A photovoltaic kitis used to rechargeportable lamps inthe Ivory Coast inAfrica. 32
  33. 33. This solar panel powers a light in a busshelter in Australia, providing security and convenience at night. 33
  34. 34. In many parts of the world, getting water is asimportant as getting energy. This experimentalsystem in Israel uses PV and wind energy in adesalination project. 34
  35. 35. Discussion Questions• Are PV systems as efficient or economic as fossil-fueled systems?• Is PV a viable alternative for all of our power needs? For homes? For vehicles? For other needs?• Is PV the answer to all of the world’s power needs? 35