Blocking Diode For Solar Panel

Blocking diodes are used to prevent your batteries from discharging backward through your solar panels at night.

Blocking diode for solar panel. The diode needs to have a voltage and amperage rating above that of the panel. A blocking diode allows the flow of current from a solar panel to the battery but prevents blocks the flow of current from battery to solar panel thereby preventing the battery from discharging. For solar panels we recommend you put one blocking diode on each solar panel inside an abs project box. As mentioned earlier the diode used in blocking and bypass diodes is mostly the same.

Now let s consider what happens if one of the panels in the above diagram is shaded. So during a sunny day the voltage of a solar panel will be higher than the voltage of a deep cycle battery so current will naturally flow from the panel to the battery. If you have two 175 watt panels each at 42 volts you will need two 8 amp 45 volt diodes. 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.

Blocking diodes are usually included in the construction of solar panels so further blocking diodes are not required. Get it as soon as wed aug 26. However they are used differently according to the purpose. Again current flows from high to low voltage.

If there is a short circuit in one of the branches the blocking diode will stop the neighboring solar panel strings to drain through the short circuited string. Free shipping on your first order shipped by amazon.