So welcome back everyone. Today we will learn, what is bypass diode, which is used in solar panel, and what is the purpose does it serve?. [Music] A solar panel is a collection of solar cells. Lots of such solar cells are connected in series to form the solar panel. When light hit on the solar panel, electricity is generated. More the light hit the panel, the more the electricity it produces. Now I will tell you more about what is bypass diode, and why it is used. When we buy new solar panels, if you look at the back side, we can see built in diode connected across the positive and negative terminal of the panel.
This diodes are called bypass diodes and, these are connected in reverse bias mode. So in general, what we will do in a solar panel is, we split the total number of cells into three groups. And connect a diode across each group of cells. Now I will tell you the purpose of using bypass diode in a solar panel. Bypass diodes are used to reduce the power loss in a solar panel, experience due to partial shading. Now I'm going to explain that in more detail. During normal operation of solar panels, that's when all the cells are conducting, the flow of current would be like this as you see.
In this condition, the bypass diode ideally will not pass any current through it Now I'll tell you what happens when shading occurs. Now imagine that a part of the cells of the panel experiencing partial shading. Then these cells opposes the flow of current generated by the other cells. Which leades to panel heat up and power loss, and also it can create local hotspots. The bypass diode helps to get rid of these issues. So instead of going through the high resistance path, the current would take a low resistance path and that low resistance path is provided by this diode. So instead of going through these solar cells the current passes through the diode. Which improves the system performance and reduces the loss. So let me conclude this. The bypass diodes are used in a solar panel for two reasons. First one is, to improve the overall system performance of the module by reducing the losses. And second one is, to provide a greater amount of product safely by avoiding the chances of formation of local hotspots. So that concludes the discussion.
Thanks for watching. [Music].