GCL System Integration Technology Co., Ltd.
Bring Green Power to Life
23
BYPASS DIODES AND BLOCK DIODES
In a system with two or more Modules connected in series, if part of a Module is shaded
while the other part is exposed to the sun, a very high reverse current will go through the cells
which have been partly or entirely covered and it will cause overheat on the cells, which may
damage the Module. Using bypass diodes can protect Modules from this kind of risk. There
are bypass diodes in junction boxes, which can reduce the effects of partial shadows. Do not
privately disassemble the junction box to replace the diodes, even when the diodes are broken.
This should be processed by the professionals.
In a system with batteries, if the controller doesn’t have the function of backswing
protection, block diodes installed between the battery and the Module can prevent the reverse
current from damaging the Module.
