The 1-sun I-V curve for a 40-cell PV module in full sun is shown below along with an equivalent circuit for a single cell (including its 10? parallel resistance). An array with two such modules in series has one fully shaded cell in one of the modules. Consider the potential impact of bypass diodes around each of the modules.

a) Sketch the 1-sun I-V curve for the series combination of modules with one cell shaded but no bypass diodes. Find the power output at the maximum power point. Compare it to the output when there is no shading.

b) Sketch the 1-sun I-V curve when the bypass diodes are included. Estimate the maximum power output now (close is good enough).

1 cell shaded 40 cells per module Current (A) 32 No Bypass Diodes 2 1 0 full sun 0 Isc 1-Sun, 1 Module 5 10 Equivalent circuit One Cell (Out of 40) 15 20 10 92 25 Voltage (V) 3 1 cell shaded 40 cells per module 30 full sun KH 35 With Ideal Bypass Diodes Bypass diodes (ideal) 40