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shading is a problem in PV modules since shading just one cell in the module can reduce the power output to zero

Shading of a Single Cell

The output of a cell declines when shaded by a tree branch, building or module dust. The output declines proportionally to the amount of shading. For completely opaque objects such as a leaf, the decline in current output of the cell is proportional to the amount of the cell that is obscured.

full_screen.pngMove the grey rectangle over the solar cell. The current is reduced by the amount of shading.

Shading of a Module

The cells in a module are all connected in series. Shading a single cell causes the current in the string of cells to fall to the level of the shaded cell.

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