Our Services
As a specialized expert assessment office, we offer a broad spectrum of assessment services for photovoltaic systems and battery storage. Our focus is on technical precision and legal admissibility.
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Court Expert Reports
Independent evidence preservation and resolution of technical disputes in civil proceedings and independent evidentiary proceedings.
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Court Expert Reports & Evidence Preservation
We prepare expert reports for civil courts, administrative courts, and arbitration proceedings. Our expert assessors are experienced in working with courts and understand the formal requirements for court-admissible documentation.
✔Independent evidentiary proceedings
✔Private expert reports as evidence
✔Technical opinions
✔Counter-expert reports
✔Defect notices and evidence preservation
✔Damage assessment and valuation
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Private Expert Reports
For system operators, investors, and companies requiring an independent technical evaluation.
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Private Expert Reports & Technical Consulting
Private expert reports serve as a basis for decisions regarding purchase, sale, or disputes with installers and manufacturers. We deliver objective, traceable evaluations.
✔Acceptance inspections for new systems
✔Yield assessment reports
✔System valuation for purchase/sale
✔Technical due diligence
✔Insurance reports
✔Damage analyses after severe weather
Insurance Reports & Damage Assessment
For damage events such as lightning strikes, fire, overvoltage, or storm damage, we determine the extent and cause of damage for insurance companies and policyholders.
✔Damage assessment after severe weather
✔Fire damage analysis
✔Overvoltage damage
✔Theft damage
✔Assessment for insurance companies
✔Support in claims settlement procedures
Service Portfolio for Insolvency Administrators
Quick Assessment (Quick-Check)
Quick assessment based on available documentation. Without on-site visit.
📄 Brief report (1–2 pp.)🕑 2–3 business days
Report for Disposal Process
Detailed analysis (documents, yield, market) in preparation for sale.
📄 Detailed (5–10 pp.)🕑 3–5 business days
Full Report (Detailed Valuation)
Court-admissible valuation incl. on-site visit, thermography, IV curve measurement.
📄 Detailed (10–20 pp.)🕑 5–7 business days
Additional Services
Documentation for sale, answering buyer questions, brief reports for creditors.
Revenue Protection
Organization and monitoring of operations management, maintenance, and fault resolution to secure the estate.
Economic Viability Review
Determination of whether continued operation is viable (OPEX vs. expected cash flows).
Repair Management
Commissioning of necessary repairs under cost-benefit considerations.
Monitoring & Safety
Ongoing monitoring for immediate detection of failures and safety risks.
Grid Operator & Remuneration
Clarification of billing issues and ensuring EEG payments.
Realization Strategy
Advisory on optimal scenarios: asset deal, share deal, individual component sale, or continued operation.
Technical Data Rooms
Preparation of all relevant documents, yield forecasts, and reports for investors (fact sheets).
Investor Communication
Technical answering of inquiries during the bidding process to avoid price discounts.
Contract Support
Technical support during contract negotiations and plausibility checks of purchase offers.
Note: Expert assessment activities are strictly separated from legal evaluations and serve the expert answering of technical evidentiary questions, as well as the maintenance of operations.
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Describe your case. We will determine which type of report is suitable for your needs.
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At a Glance
The PV-BESS-Assessor experts of Prosperus GmbH prepare independent, court-admissible expert assessment reports for photovoltaic systems and battery storage (BESS). Our service portfolio ranges from yield assessments through damage analyses to technical due diligence — TUV-certified and available Europe-wide.
Risk Matrix — BESS Technical Due Diligence
Probability
high
Cell Aging
BMS Condition
Fire Safety
medium
Grid Compliance
Revenue Model
low
Contract Status
low
medium
high
Impact Severity
What photovoltaic assessments do we prepare?
Our service portfolio in the photovoltaic sector covers all expert assessment and testing tasks. This includes yield assessment reports to evaluate actual system performance, defect analyses per DIN VDE 0100-600, damage assessment reports for fire, hail, and lightning strikes, independent acceptance inspections for new installations or purchases, drone thermography and electroluminescence for non-destructive fault detection, VdS 3602 inspections for insurance coverage, DGUV Regulation 3 inspections for occupational safety, lightning protection inspections per DIN EN 62305, as well as residual value determinations and repowering assessments for existing systems.
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What BESS assessments do we prepare?
For battery storage systems and utility-scale storage, we offer commissioning and acceptance assessment reports for new installations, technical due diligence for investors and banks, bankability assessment reports for financing assurance, revenue assessment reports for revenue stacking with FCR, aFRR, mFRR, and arbitrage, capacity measurements and state-of-health determinations, damage assessment reports for thermal runaway and BMS failures, safety assessments per DIN EN IEC 62619, AwSV inspections for water-hazardous substances, and noise emission forecasts per TA Larm.
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Who do we work for?
Our clients include private individuals, commercial enterprises, agricultural operations, insurance companies, banks and financial institutions, lawyers, courts, as well as project developers and investors. Our assessment reports are court-admissible and are recognized as evidence by courts across Europe.
What measurement technology do we use?
We work with state-of-the-art measurement technology: drone-based infrared thermography for detecting hotspots and cell damage, electroluminescence measurement for identifying micro-cracks, IV curve measurement for performance evaluation of each individual module, insulation resistance measurement of all DC and AC circuits, and visual inspection per DIN EN IEC 61215. For BESS, we additionally perform BMS function tests, capacity tests, and safety assessments according to applicable standards.
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