Tut 4

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Page 1 of 2 SOLA2540 & SOLA9001 Applied Photovoltaics Tutorial 4 Question 1 One solar cell has an open-circuit voltage of 0.55 V and a short-circuit current of 1.3 A. A second cell has values of 0.60 V and 1.0 A for these parameters. Assuming that both cells have an ideality factor of unity, calculate the open-circuit voltage and short-circuit current of the combination when the cells are connected: (a) in parallel; (b) in series. Question 2 An ideal solar cell (no resistive losses) has an open circuit voltage of 620mV, short circuit current of 2.5 Amps, ideality factor of 1 and T = 300K (nkT/q = 26mV). (a) Write an equation for V MP in terms of I MP , I 0 and I L . Given that I MP = 2.38A, calculate P MP. (b) 36 identical cells to that in (a) are connected in series to form a module. Sketch the output current- voltage curve, labelling Voc and Isc. (c) What size load in ohms is best matched to this PV module? (d) The above solar cells have a total area of 100 cm 2 and are illuminated by light of wavelength 1.0 microns. Assuming a quantum efficiency of 0.80 (80%), calculate the light intensity falling on the cells in mW/cm 2 .

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• One '14
• Photovoltaics, Solar cell, solar cells, Photovoltaic array, shaded cell

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