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Lecture 28

Lecture 28. October 30, 2013. Stand Alone PV. San Luis Valley Solar Data (09/11/2010) Good Day [1]. San Luis Valley Solar Data (09/12/2010) Bad Day [1]. Intermittent Wind Generation. 5. Battery. Battery Equivalent Circuits. Lead Acid Battery. Battery Charge Discharge. Household Loads.

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Lecture 28

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  1. Lecture 28 October 30, 2013

  2. Stand Alone PV

  3. San Luis Valley Solar Data (09/11/2010) Good Day [1]

  4. San Luis Valley Solar Data (09/12/2010) Bad Day [1]

  5. Intermittent Wind Generation 5

  6. Battery

  7. Battery Equivalent Circuits

  8. Lead Acid Battery

  9. Battery Charge Discharge

  10. Household Loads

  11. Household Loads.

  12. Electronic Loads

  13. Battery Types Energy Density.

  14. NaS Batteries For Grid6h at 1MW • 1 Operating temperature 300 to 350o C

  15. NaS Battery Characteristics

  16. Picture NaS Battery

  17. Present Value

  18. Levelized Costs

  19. Nickel Metal Hydride

  20. Vanadium Redox Flow Battery

  21. Picture VRB System

  22. Present Value $/kw VRX

  23. Levelized Costs

  24. Zn Air Battery

  25. Zinc-Air Battery Prototype

  26. Zinc – Air Cell

  27. Present Value

  28. Levelized Costs

  29. Li Ion Battery

  30. Li Ion Battery

  31. Types of Li Ion Cells

  32. Big System

  33. Smaller System

  34. Home Li Ion

  35. Present Value Li Ion

  36. Levelized Costs Li Ion

  37. Li Ion Charge, Discharge Curves

  38. Internal Resistance Li Ion Battery

  39. Lead Acid Batteries

  40. 1 MW Lead Acid Battery

  41. Big System

  42. Present Value $/kW and $/kWhLead Acid

  43. Levelized Costs Lead Acid

  44. Some Limits On Batteries • 1. Depth of Discharge. • A. Car Batteries limits to 25% Life 10yr • At 50% cut life in half. Strengthen with Ca • B. For solar cells need 50 to 80% This means thicker electrodes bigger space between electrodes. Sb • C. Over charging leads to H2O→ 2H2 +O2 • D. Capacity depends on rate of charging and discharging. • E. Temperature dependence lower capacity at low temperatures

  45. State of Charge • 1. Internal resistance increases as the battery is discharged or with state of charge • 2. This makes it hard to calculate watt hours. • 3. Change to ampere hours and P= Vx I • 4. Specify in C= Ampere hour capacity • C/20 means capacity for full discharge over 20hr.

  46. Temperature Dependence of Lead Acid Battery

  47. Deep Cycle Lead Acid Batteries

  48. Rates of Charge and Discharge Change Capacity and Life

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