๐ What is PID (Potential Induced Degradation)?
PID occurs when high voltage stress causes leakage current from solar cells to the module frame or glass, leading to rapid efficiency loss.
๐จ Major Causes:
High temperature
High humidity
High negative voltage stress
Poor or improper grounding
Large system voltage (1000V / 1500V plants)
PID is not a surface problem — it’s an electrical stress issue that attacks cell performance internally.
๐ How PID Impacts Your Solar Plant
When PID starts developing, you may notice:
✔ String current mismatch
✔ Sudden PR (Performance Ratio) drop
✔ IV curve knee point shift
✔ Dark patches in EL (Electroluminescence) testing
✔ 20–30% annual energy yield reduction
Left untreated, PID can cause permanent degradation.
๐งช How to Identify PID in Your Plant
1️⃣ String-Level Analysis
– Some strings on the same inverter show significantly lower current.
2️⃣ IV Curve Test
– Noticeable knee point shift and reduced fill factor.
3️⃣ EL Testing (Electroluminescence)
– Dark patches visible on affected cells.
4️⃣ Megger / Insulation Resistance Test
– Insulation resistance drops significantly.
๐ How to Prevent & Recover from PID
✅ Install an Anti-PID box (night-time recovery up to 70–90% possible)
✅ Maintain proper earthing (<1 ohm preferred)
✅ Use PID-resistant certified modules
✅ Perform regular string-level monitoring
✅ Include IV curve & thermography testing in O&M schedule
✅ Apply reverse bias at night to recover affected cells
๐ฏ Key Message for Developers & EPC Teams
PID is NOT a cleaning issue.
It is a design + electrical stress issue.
✔ Early detection = Performance recovery
❌ Late detection = Permanent degradation
If you’re managing rooftop or utility-scale projects, it’s time to review your system health.
Let’s protect 25 years of performance, not just today’s generation.
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