Mitigating the Effects of Spot Shading on the Power Output of a Solar Module
Presenter: James Wafula and Izael da Silva
| Shading of half a single cell in a crystalline solar module results in over 30 % loss in power output. The power recovered by the shunt diodes in a partially shaded module averts the hot spot problem but this recovered energy is not used productively in the external circuit. Partially shaded conditions create multiple peaks in the power curve of the module that increases the complexity of MPPT techniques implemented in charge controllers. Solar Home Systems comprising single-module installations, commonly found in sub-Saharan Africa are especially vulnerable to partial shading conditions with small shading resulting in an entire installation being disabled.
James Wafula and Izael da Silva: Micro Perspective for Decentralized Energy (MES) 2015, Bangalore, India.