Ein Ertragsgutachten ist dann sinnvoll, wenn es nicht mehr um „Gefühl“ geht, sondern um belastbare Nachweise: Abweichung quantifizieren, Ursache erklären, Maßnahmen priorisieren.
GoalAssess underperformance in a provable way
ResultCause + yield impact + actions
ForOperators, insurance, disputes, acquisition checks
FocusEngineering, data, measurement, documentation
Typical triggers
- Consistently below forecast: Yields fall clearly short of expectations
- Dispute with installer: “Everything is normal” vs “yield is missing”
- Insurance / settlement: when causes and impacts must be assessed
- Investor check: Plausibility of yields before purchase/sale
Approach (practical and traceable)
1) AnalysisData, documents, plausibility checks, comparison periods
2) Narrowing downWhich inverters/trackers/strings deviate? Build hypotheses
3) VerificationOn-site inspection and measurements where anomalies appear
What you can prepare (saves time and cost)
- Yield data (daily/monthly), ideally per inverter/tracker
- Error logs / fault messages
- System data (kWp, orientation/tilt, components)
- String layout / module layout (if available)
- Info on shading/changes at the site
Important: Monitoring shows deviation—an expert report delivers the robust cause and quantifies the impact. That’s what matters for warranty, settlement or disputes.
FAQ
When is a PV yield report useful?
With persistent underperformance, when warranty/insurance is involved, or when causes must be proven.
What data is needed?
Yield data, inverter/tracker data, fault logs, system parameters, and ideally string plans.
How does an expert report differ from monitoring?
Monitoring detects deviations. An expert report explains the cause, quantifies the effect, and provides robust documentation for third parties.
Free initial assessment
Send a brief summary (system, period, issue) and I’ll tell you whether a yield report makes sense.
Email: info@gutachterpv.org
Enquire now