If you have two 175 watt panels each at 42 volts you will need two 8 amp 45 volt diodes.
Blocking diode for 100w solar panel.
Blocking diodes will be of benefit in any system using solar panels to charge a battery.
Learn how and why blocking diodes and bypass diodes are used.
Diode and unidirectional flow of current.
Now let s consider what happens if one of the panels in the above diagram is shaded.
A blocking diode and bypass diode are commonly used in solar energy systems and solar panels.
For solar panels we recommend you put one blocking diode on each solar panel inside an abs project box the diode needs to have a voltage and amperage rating above that of the panel.
In short as diode only passes current in one direction so the current from solar panels flows forward biased to the battery and blocks from the battery to the solar panel reverse biased.
Blocking diode in a solar panel is used to prevent the batteries from draining or discharging back through the pv cells inside the solar panel as they acts as load in night or in case of fully covered sky by clouds etc.
Not only will that panel not be.
In this video you will learn the importance of a bypass diode in solar panel learn how to connect a bypass diode to your own solar cells to improve the eff.