Solar photovoltaic systems are robust long-term investments – but they are not indestructible. Whether caused by weather, manufacturing defects, improper installation, or simple ageing: nearly every system develops damage over the years that reduces output and, in serious cases, creates safety hazards. An independent, certified PV expert identifies these issues early and produces authoritative reports for insurers, courts, and property transactions.
1. Hotspots – the Silent Output Killer
What are hotspots?
Hotspots occur when individual solar cells are subjected to greater load than their neighbours – caused by shading, soiling, cell cracks, or faulty bypass diodes. The affected cell can heat up locally to 200 °C.
- Permanent output loss across the entire string
- Fire risk from severe hotspots
- Manufacturer warranty void where overheating is documented
Detection via infrared thermography: temperature differences >10 K between adjacent zones are considered critical (IEC 62446-3).
2. PID Effect – Potential-Induced Degradation
What is PID?
Leakage currents between the module frame and solar cells damage the anti-reflective coating and p-n junction. Output loss: 10–80 % in affected modules.
A PV expert report with electroluminescence imaging is the only reliable way to identify PID – critical for insurance claims and manufacturer warranty disputes.
3. Micro-Cracks
Origin and risk
Hail, snow load, installation errors, or thermal cycling create invisible cracks that progressively lead to cell separation and significant output losses.
Detection via EL measurement, classification according to IEC 60904 / SEMI PV17.
4. Delamination & EVA Yellowing
Moisture or manufacturing defects cause bubbling and detachment of the EVA encapsulant. UV-induced yellowing reduces light transmission by up to 15 %.
5. Snail Trails
Brown discolourations caused by silver paste oxidation combined with moisture – often accompanied by micro-cracks. Significantly reduces resale value.
6. Corrosion & Contact Issues
Corroded MC4 connectors are a leading cause of PV fires. Early detection via thermography and visual inspection is essential.
What Does a PV Expert Report Deliver?
- Type and extent of damage with normative classification (IEC/EN standards)
- Root cause analysis – manufacturing defects, installation quality, external factors
- Output loss quantified in kWh and monetary value
- Recommendations – repair, module replacement, monitoring
- Court-admissible documentation for insurance claims and warranty disputes
Our independent certified PV assessors produce your report – for insurers, courts, or property sales. Operating across Europe.
Request Expert Report →FAQ
How much does a PV expert report cost?
For residential systems (5–15 kWp) from approx. €500–900. Large installations on request.
How long does a PV assessment take?
On-site 2–4 hours, written report within 5–10 working days.
Can an expert report compel an insurer to pay?
Yes – a standards-compliant report is often the decisive factor in disputed claims.
Email: info@gutachterpv.org