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 4 3 Current (amps) 0 1-sun = 1000 w/m Noon 11am and 1 pm 10 am and 2 pm 24 10 12 V (volts) Figure P9.2a a. What is the resistance of the load? 408 Hool 8 m 9 am and 3 pm 8 am and 4 pm R Modules in series (b) 14 16 Modules in parallel (c) R Resistance load 18 20 22 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? Latitude 33.93 N July Aug Sep Oct 4.5 5.5 7.1. 6.8 5.9 5.0 5.0 5.7 6.6 6.6 6.0 5.4 4.7 4.7 5.1 5.6 5.4 5.2 5.8 6.0 5.7 5.5 5.0 4.1 4.1 3.8 2.5 2.2 2.4 3.0 3.6 4.2 4.3 5.1 6.0 7.1 8.2 7.8 7.7 8.7 8.4 7.4 6.6 5.6 18.7 18.8 18.6 19.7 20.6 22.2 24.1 24.8 24.8 23.6 21.3 18.8 21.3 Los Angeles, CA Jan Feb Mar Apr May Jun Tilt Lat - 15 Lat Lat+15 90 1-Axis (Lat) Temp. (C) Radiation data measured in kWh/m-day, average daily maximam temperature (C). 3.8 4.4 CF=0.087V- PR D 6.4 6.4 6.3 6.1 5.9 3.3 6.4 6.0 (Rayleigh winds) (6.65) Nov Dec Year 3.6 5.5 4.2 5.6 4.5 5.4 4.1 3.5 4.9 7.0