The four steps in lesson 3 in module 1.2 in the Photovoltaic course 1.
PV M 1.2 L 3 S 1
PV M 1.2 L 3 S 2
PV M 1.2 L 3 S 3
PV M 1.2 L 3 S 4
PV M 1.2 L 3 S 5
PV M 1.2 L 3 S 6
PV M 1.2 L 3 S 7
PV M 1.2 L 3 S 8
