5 A new PV module note that the module is comprised of sever

5) A new PV module (note that the module is comprised of several individual PV cells) has the following i-V curves illustrated on the following page.

Solution

Given Power output of the module under STC condition is P_m = 210 W;

From the I- V characterstic of PV module V_OC = 50.1 V and I_SC = 5.6 A at STC i.e 1000 W/m² , 25⁰C,1 air mass.

Maximum Power Point of PV module is P_m = V_m * I_m = 210 V.

From the graph maximum power point Voltage is V_m = 40 V

Maximum power point Current I_m = P_m / V_m = 210/40 = 5.25 A

Fill factor is defined as ratio of maximum point to V_OC*I_SC

F = P_m / (V_OC * I_SC) = 210 / (50.1 * 5.6) = 210/280.56 = 0.7485 ;

a) Energy Conversion efficiency is given by

%eta = ( P_m / (L*B*1000) ) *100

where L = 1.580 m is length of module and width of module is B = 0.812 m

%eta = ( 210 / (1.58*0.812*1000) ) *100 = 16.3683 %

b) No.of modules required to meet load of 4.2 kW is

N = 4200/210 = 20 panels.

No.of panels connected in series is n_s = V_DCT / V_oc = 300 / 40 = 7.5 = 8 panels.

No.of Panels connected in Parallel is n_p = 4200/(300*6.25) = 2.24 = 3 strings consisting of 8 panels each.

c) Each module weight is 15 Kg . Total weight of modules is 24*15 = 360 Kg and mounting structure is of weight same as modules i.e 360 Kg.

Total weight on building is W_T = 720 Kg.