Use of Blocking Diode In Solar Panels

 

  • During daylight, an array has more voltage potential than the battery, so current flows from the array into the battery.
  • But at night, the module potential drops to zero, and the battery will be discharged all night, backward through the module.
  • This would not be harmful to the module but would result in a loss of precious energy from the battery bank.
  • Diodes placed in the circuit between the module and the battery can block any nighttime leakage.
  • Blocking diodes (series or isolation diodes) conduct current during normal system operation and are placed in series with a module/string/array.
  • Its main purpose is to prevent current from flowing backward through the modules at night and prevent current from flowing into a faulty parallel string.



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