Lesson 24: Photocell Electrical Characteristic and Circuit Model ET 332a Dc Motors, Generators and Energy Conversion Devices 1Lesson 24 332a.pptx.

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Presentation transcript:

Lesson 24: Photocell Electrical Characteristic and Circuit Model ET 332a Dc Motors, Generators and Energy Conversion Devices 1Lesson a.pptx

2 Learning Objectives After this presentation you will be able to:  Identify and interpret a photocell electrical characteristic  Find the maximum power output from a photocell  Calculate a photocell’s efficiency  Determine circuit model parameters for a photocell given its characteristic curve  Perform a calculation using the circuit model of a photocell.

Lesson a.pptx3 Fill Factor = FF P m = Maximum cell power 0.7 <FF<0.85 Typical FF range Cell Efficiency P I = incident solar power Photocell Characteristic Curve

Lesson a.pptx4 Solar Cell Characteristics Example (1)

Lesson a.pptx5 Solar Cell Characteristics Example (2)

Lesson a.pptx6 Solar Cell Characteristics Example (3)

Lesson a.pptx7 Solar Cell Characteristics Example (4)

Lesson a.pptx8 Circuit Model of Solar Cell R s slope of characteristic near V oc R sh slope of characteristic near I sc Values determined by cell construction

Lesson a.pptx9 Solar Cell Circuit Model Parameters Cell Characteristic

Lesson a.pptx10 Solar Cell Circuit Model Example (1)

Lesson a.pptx11 Solar Cell Model Example (2)

Lesson a.pptx12 Solar Cell Efficiency  AM1.5 Solar Intensity (Incident power density) 1000 W/m 2 or 100 W/cm 2  Losses  Photon Energy -47% of photons have eV<1.1, 30% goes to heat  Voltage factor – ratio of energy given to energy required to produce electron 0.65  Recombination – electron/holes that recombine 10%  Reflection – reduced to 4%  Overall Efficiency  c = (0.47)(0.65)(.10)(.96)=.26  26% Maximum efficiency using current technologies

End Lesson 24 ET 332a Dc Motors, Generators and Energy Conversion Devices Lesson a.pptx13