03/02/2023
Fire breaks out in solar energy systems generally because of three main things, which are as follows:
1- Insulation fault (such as wounds between two wires as a result of mechanical stress, insulation corrosion over time, water leakage, etc.) )
2- Overloading cables (passage of a current that is not supported by the wire)
3- Reverse current in the solar panel reverse current, and we'll talk about this a little bit...
Reverse current in solar panels reverse current occurs as a result of:
1- Palace in the circle short circuit (as a result of negative touch and solar panel - or due to any connection error faulty wiring)
2 - The effect of matrix PV strings on each other, and this is the core of the matter and it happens as follows:
When the effort of the open-circuit voltage of a single string is significantly different from the effort of an open circuit for the rest of the chains parallel to it and connected to the same inverter or regulator or wherever it was ...
As this leads to current flowing from sound matrices to the matric that has weakness instead of flowing to the inverter and supplies the pump, battery or network... With the energy that is required .
Reverse current can lead to a dangerous rise in temperatures and cause fires in the solar matrix. Therefore, the endurance of the solar panel should be tested according to IEC 61730-2 standard and the manufacturer should provide a maximum reverse current value (IRM).
And here comes the importance of choosing the quality of solar panels, in conjunction with the importance of making electrical protectors from diodes, breakers, systems, etc...
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