No. That is to say that they can allow full current to flow in a panel which is partially shaded, but the resulting output voltage will be lower and so that panel will not contribute much if anything to the total output.
Instead you will get full voltage at whatever current the damaged section is capable of carrying without the bypass diode being active. In other words, the exact same power output as you would see without the diode there at all.
Instead you will get full voltage at whatever current the damaged section is capable of carrying without the bypass diode being active. In other words, the exact same power output as you would see without the diode there at all.
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