A given solar cell has the following specifications:Open-circuit voltage, Voc: 0.7 VShort-circuit current, Isc: 3 AVoltage at maximum power, Vmp: 0.5 VCurrent at maximum power, Imp : 2.65 ACalculate the fill factor.

• A. 1.23
• B. 0.81
• C. 0.63
• D. 1.58

Answer: (C)

Where,
Pmp is maximum power in watt
Vmp maximum voltage at maximum power in volt
Imp is maximum current at maximum power in ampere
Voc open circuit voltage in volt
Isc is short circuit current in ampere

Fill Factor = Pmp/(Vosc*Isc) = (Vmp*Imp)/(Voc*Isc)
= (2.65*0.5)/(0.7*3)
= 0.63