A PV module is made up of 75 identical cells all wired in se

A PV module is made up of 75 identical cells, all wired in series, i.e., a string. Assume a 2 sun insolation (2 kW/m2). Each cell has a short-circuit current ISC = 6.0 A and an open circuit voltage of VOC = 0.6 V. The series resistance of each cell is Rs = 0.1 ohm.

a) What would the voltage, current and power be from the module?

b) If the 75 cells are divided into 3 parallel strings calculate, the voltage, current and power delivered form the module? Again assume the series resistance for each cell is Rs = 0.1 .

Solution

a) Here the number of cells in parallel M=1 and

the number of cells in series N=75

Voltage from the circuit=N*V_OC=75*0.6=45V

Current from the circuit=M*I_SC=1*6=6A

Power from the circuit=V_OC*I_SC=45*6=270W

b) Here 75 cells are divided into 3 parallel strings of 25 each

So M=3 and N=25

Voltage from the circuit=N*V_OC=25*0.6=15V

Current from the circuit=M*I_SC=3*6=18A

Power from the circuit=V_OC*I_SC=15*18=270W