The test requires a DC voltage meter, and it helps to detect intermittent connection issues or open sub-circuits inside the module (such as diodes or solder traces).
PID is essentially a voltage leak. It happens when a difference in electrical potential between the solar cells and other panel materials, like the frame, causes ions to migrate. This can create a kind of "shadow" or dark patch on the panel.
The best, quickest, and easiest way to test a solar module is to check both the open circuit voltage (Voc) and short circuit current (Isc). Depending on the reason for testing; the test can be done: at the controller; at the combiner box (if.
On average, throughout the day, your 100 watt monocrystalline solar panel or polycrystalline panel can generate an average of 2. Nevertheless, this value can increase in the middle of the day and reach a maximum of 5.
This means your solar panel is generating voltage (open circuit), but the circuit is incomplete and therefore cannot generate current. This could be due to a loose or broken wire, a faulty inverter or charge controller, a poor connection, or an internal problem with the panel.
Working Principle: The working of solar cells involves light photons creating electron-hole pairs at the p-n junction, generating a voltage capable of driving a current across a connected load.
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