To understand the working mechanism behind blocking diodes, we will consider a simple example. Let’s suppose you need to charge a battery using two solar panels. For that, you will also need a charge controller, depending on.
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However, most of the solar panel array already has a built-in bypass and blocking diodes. Nevertheless, you still have to be careful. I hope this article helped you in learning about blocking diodes and how they are necessary for solar panels.
Check the terminal box of the solar module. The blocking diode is usually located at the positive end of the series string inside this box. Examine the configuration of the diodes. Blocking diodes are connected in series with the solar panel. Blocking diodes can significantly affect the fault analysis in solar panels:
Examine the configuration of the diodes. Blocking diodes are connected in series with the solar panel. Blocking diodes can significantly affect the fault analysis in solar panels: With Blocking Diodes: Faults such as line-to-line (L-L) do not reverse the current through the faulty string, as the diode blocks the backflow.
This causes the solar panel to heat up and have some power loss. Those shaded solar cells become consumers of electricity instead of producers. Bypass diodes inside a junction box of a solar panel provide a low resistance path for the current go around a series of solar cells that have been shaded. The diode is wired in parallel with the cells.
If one cell is covered by a leaf, the second string of solar cells will not produce any current. If there were no bypass diodes, the whole solar panel would produce none or very little current. Thanks to the bypass diodes, the solar panels will still produce 2/3 of it’s rated current.
They mostly come with built-in blocking diodes to prevent the current from flowing backward into the solar panels at night. In simple words, your battery won’t discharge because of the blocking diode in the charge controller.
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