2. The graphs show the performance of a crystalline silicon solar panel. Figure 1 Current (A) 14 12 20% 642 10 8 0 Figure 2 600 16 550 14 500 12 450 400 350 300 250 200 150 Power (W) Current (A) 10 8 100 2 50 0 0 0 10 20 30 40 50 Voltage (V) 10 20 30 40 50 Voltage (V) 25C 50C 75C 800W/m - 600W/m -400W/m -200W/m 1000W/m a. The efficiency of the solar panel is the ratio of maximum power output to solar power input. The efficiency of the solar panel is given as 22.5%. From Figure 1, what is the area of the solar panel? [Answer: 2.4 sq.m.] b. The "fill factor" of a solar panel is the ratio of maximum power to the product of the cell short circuit current and open circuit voltage. Fill Factor = Pmax/IscVoc What is the Fill Factor for the solar panel at 1000 W/m? Is it the same at 200 W/m? c. Figure 2 shows the effect of temperature on cell efficiency. Cell efficiency decreases with temperature. The data were measured at 1000 W/m. Temperature dependence on cell efficiency can be expressed as nt = 1 y(T - Tsc) Where nt = efficiency at a temperature T, no = efficiency at a standard temperature Tsc. The y is the constant of proportionality. The standard temperature is 25 deg.C. From Figure 2, what is the value of y? [Answer: y = 0.0036 (C)-. ]