9.2 Consider a single PV module supplying power to a resistance load. The hour-by-hour I-V curves for the PV module are shown below along with the I-V curve for the resistance. For simplicity, consider each I-V curve to apply for one hour (e.g., the "8-A.M." curve is from 7:30 A.M. to 8:30 A.M.). 5 1-sun = 1000 w/m² Noon 11am and 1 pm Resistance load Current (amps) 4 10 am and 2 pm ♡ 9 am and 3 pm 2 8 am and 4 pm 0 0 2 4 6 8 10 12 14 16 18 20 20 V (volts) Figure P9.2a a. What is the resistance of the load? W R Modules in series (b) Modules in parallel (c) R Figure P9.2b b. Suppose the same resistive load is connected to two such modules wired together in series (so their voltages add). Draw the I-V curves for the pair of modules and from that, determine the daily energy delivered (W-hr). Compare that with the energy that would have been delivered with just a single module. c. If two modules are connected in parallel (so their currents add), what would be the daily energy delivered to the same resistive load? 22 Los Angeles, CA Latitude 33.93°N Tilt Jan Feb Mar Apr May Jun July Aug Sept Oct Nov Dec Year Lat 15 3.8 Lat 4.5 4.4 5.0 5.5 6.4 6.4 6.4 7.1 6.8 5.9 5.0 4.2 3.6 5.5 5.7 6.3 6.1 6.0 6.6 6.6 6.0 5.4 4.7 4.2 5.6 Lat+15 90 4.7 5.1 5.6 5.9 5.4 5.2 5.8 6.0 5.7 5.5 5.0 4.5 5.4 4.1 4.1 3.8 3.3 2.5 2.2 2.4 1-Axis (Lat) 5.1 6.0 7.1 8.2 7.8 7.7 8.7 8.4 3.0 3.6 7.4 6.6 4.2 4.3 4.1 3.5 5.6 4.9 7.0 Temp. (°C) 18.7 18.8 18.6 19.7 20.6 22.2 24.1 24.8 24.8 23.6 21.3 18.8 Radiation data measured in kWh/m²-day, average daily maximum temperature (°C). 21.3 PR CF = 0.087V (Rayleigh winds) (6.65) D²