Troubleshooting Solar Panel

Troubleshooting a solar panel becomes necessary when you notice that your solar panel system isn’t producing properly.



  • Run A Shading Test:
  • If the array configuration is in a parallel or series-parallel, you don’t need to disconnect any wires.
  • Cover or shade just a few cells with any large enough object and the module’s output will drop down a half.
  • Monitor the current as you shade a section of one module and see if the current should drop. On the other hand if the current does not drop, obviously the module you have covered is disconnected from the circuit.
  • Check for the wiring of that module to resolve the fault.
  • Burnt Terminals
  • Temperature cycling could at times cause a metal resistance or loosen screws.
  • An oxidation or corrosion could cause electrical resistance.
  • Replace the oxidized metal parts or tighten a loose screw.
  • Avoid wiring too many panels to a terminal.
  • Add other terminals, if you had many panels.
  • Analyze For Heat Fading:
  • When the sun causes the solar panel system to overheat, this result in heat fade.
  • A simple detective way is, when the sun is at its highest peak, this will drop the system electricity output in your home.
  • The solution is to check the wire connection for inefficient wire or a short wire connection. And replace with a specified wire.
  • Diode Failures:
  • To prevent cells from overheating if there is a minor shade over them, some PV module uses bypass diode.
  • In most cases when it shorts out, this reduces the modules voltage to zero ohms in both directions.
  • Modules with a 12V array need no bypass diode. While a 24V array will rarely experience sustained minor shading, so you may not need to remove it. But of other cases, you need to replace with a silicon diode of an amp that is within or above the module’s maximum current, and of a voltage rating of 400V.
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