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Diodes are a one way valve for electricity. They also cause a bit of loss while in use. The balance is to have enough to prevent panel shutdown, but not so much as to cause reduction in power.
In a PV panel, they allow an electrical route around a group of shaded wafers .
Most PV panels over 50 watts have BYPASS diodes factory installed
In a battery system, they prevent nightime backfeed discharge into the PV panels.
(Note, most controllers built since the 90's, have the BLOCKING diode function built into them, as a FET)
Here's a short article about modernizing panel bypass diodes
So, in closing, 99.6% of the time, the end user never needs to worry about them.
In a PV panel, they allow an electrical route around a group of shaded wafers .
Most PV panels over 50 watts have BYPASS diodes factory installed
In a battery system, they prevent nightime backfeed discharge into the PV panels.
(Note, most controllers built since the 90's, have the BLOCKING diode function built into them, as a FET)
Here's a short article about modernizing panel bypass diodes
So, in closing, 99.6% of the time, the end user never needs to worry about them.
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