{"id":64795,"date":"2026-01-13T16:00:01","date_gmt":"2026-01-13T15:00:01","guid":{"rendered":"https:\/\/o7wkziwp0p-staging.wpdns.site\/technical-due-diligence-photovoltaics-bess\/"},"modified":"2026-10-26T15:58:05","modified_gmt":"2026-10-26T14:58:05","slug":"technical-due-diligence-photovoltaics-bess","status":"publish","type":"page","link":"https:\/\/greentech.energy\/en\/technical-due-diligence-photovoltaics-bess\/","title":{"rendered":"Technical Due Diligence Photovoltaics & BESS"},"content":{"rendered":"
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Technical Due Diligence for PV and BESS<\/h1>

Before purchase, sale, or commissioning, our Technical Due Diligence provides you with complete clarity on the technical condition and performance potential of your photovoltaic system or BESS.
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Inquire Now<\/a>Learn more<\/a><\/div><\/div><\/div><\/div>
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Technical assessment for maximum transparency and security<\/span><\/h2>\n<\/div><\/div>\n<\/div>\n\n
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Clarity for your investment. Security for your project.
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Our Technical Due Diligence provides the technical transparency you need to make well-informed decisions regarding purchase, sale, or commissioning. We verify whether the design, execution, and actual system condition align - independently, in depth, and always with a focus on future performance.<\/p>\n

Our experts analyse all relevant documents, assess structural design, electrical design, and installation quality, and identify weaknesses before they become risks. This creates a reliable basis for realistically assessing yields, safeguarding investments, and making effective use of potential.<\/p>\n

We tailor our services - from Technical Due Diligence to additional inspections and special services - individually to your needs.<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n

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We inspect your PV systems <\/span>and battery storage systems<\/span><\/h3>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n
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Technical Due Diligence (TDD) for PV systems<\/h4><\/div><\/div><\/div>\n\n

For photovoltaic systems, we assess both planned projects and operational assets.<\/p>\n

We review all relevant documents and documentation, detailed design, and technical components. Based on this assessment, we identify design or implementation weaknesses, optimisation potential, and risks to future energy yield.<\/p>\n

Partial services are also possible, e.g., a thermography inspection, review of DC and\/or AC detailed design as a design review, or assessment of individual system components to obtain targeted information on specific questions or risks.<\/p>\n<\/div><\/div>\n<\/div>\n\n

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Technical Due Diligence (TDD) for BESS<\/h4><\/div><\/div><\/div>\n\n

For battery storage systems, we assess the technical feasibility of the design as well as the execution of existing systems.<\/p>\n

All relevant documents, the battery system layout, electrical design, inverter design, and connection to grid and monitoring systems are analysed. This enables us to identify risks, optimisation potential, and possible impacts on system performance and safety.<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n

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When <\/span>is a Technical Due Diligence (TDD) useful?<\/h2>\n<\/div><\/div>\n<\/div>\n\n
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When buying or selling an asset<\/h3>

Technical Due Diligence is useful when buying or selling because it objectively determines the actual value of the asset and makes potential risks or optimisation opportunities transparent, providing buyers and sellers with a robust basis for price negotiations.<\/p>\n<\/div><\/div>\n\n

To review EPC contractors or technical service providers<\/h3>

Technical Due Diligence helps assess the quality of the responsible partners involved and ensures that all technical requirements, standards, and contractual specifications are reliably met.<\/p>\n<\/div><\/div>\n\n

When warranties are expiring or damage has occurred<\/h3>

Before warranties expire or in the event of damage, a Technical Due Diligence for photovoltaics\/BESS enables a technically sound assessment of the system condition, so that claims against manufacturers or service providers can be asserted clearly and transparently.<\/p>\n<\/div><\/div>\n\n

For greater transparency in project financing<\/h3>

For financing, Technical Due Diligence provides the technical and commercial evidence banks and investors need to reliably assess the design, performance, and risk profile of a photovoltaic or BESS project.<\/p>\n<\/div><\/div>\n\n

As an analysis prior to revamping or repowering<\/h3>

Before planned modernisations, a Technical Due Diligence for photovoltaics helps uncover technical weaknesses and efficiency potential and assesses which improvements can be achieved through new components or design adjustments. Drone-based thermography inspections are often used as well.<\/p>\n<\/div><\/div>\n\n

As a regular quality and performance inspection<\/h3>

During operation, Technical Due Diligence supports continuous monitoring of a system\u2019s technical quality and performance and ensures long-term availability and operational safety.<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n

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What sets our Technical Due Diligence <\/span>apart?<\/h2>\n<\/div><\/div>\n\n

Holistic assessment, independent evaluation, commercially prioritised<\/h3>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n
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Holistic view of design, construction, and operations<\/h3>

greentech combines expertise from design, construction, operations management, and performance analysis. This 360\u00b0 understanding results in assessments that are accurate both technically and commercially. <\/p>\n<\/div><\/div><\/div><\/div>\n<\/div>\n\n

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Over 1 GW of inspected systems \u2013 hands-on experience<\/h3>

With more than 1 GW of inspected PV projects, we immediately recognise typical fault patterns, technical risks, and optimisation potential. This saves time and reduces investment risks. <\/p>\n<\/div><\/div><\/div><\/div>\n<\/div>\n\n

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Detailed analyses with modern measurement technology<\/h3>

In addition to visual inspections, we use drone thermography, string measurements and performance analyses. This reveals hidden defects and yield losses that remain undetected in document-only reviews.<\/p>\n<\/div><\/div><\/div><\/div>\n<\/div>\n<\/div>\n\n

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Clear recommendations, commercially prioritised<\/h3>

The results are presented clearly and include specific action steps\u2014along with a technical assessment and commercial relevance. This enables measures to be implemented directly and in a targeted manner. <\/p>\n<\/div><\/div><\/div><\/div>\n<\/div>\n\n

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Certified professionals with independent assessment<\/h3>

Our T\u00dcV- and VdS-certified experts inspect systems objectively, in compliance with standards, and from the perspective of external investors or banks. This creates robust, trustworthy decision-making foundations. <\/p>\n<\/div><\/div><\/div><\/div>\n<\/div>\n\n

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Flexibility \u2013 from full scope to individual inspections<\/h3>

Whether a complete Technical Due Diligence or individual modules such as thermography, electrical design reviews, or documentation review: we tailor the scope precisely to the project phase, requirements, and budget.<\/p>\n<\/div><\/div><\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n

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Our services in detail<\/h2>\n<\/div><\/div>\n\n

Core components of our Technical Due Diligence <\/span><\/h3>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n
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\"Review<\/span><\/div>\n<\/div>\n\n
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Technical document review<\/h4>\n

A technical review is carried out to verify compliance with regulatory requirements and to check the relevant documents, including the development plan and the status of the grid connection.<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n

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Review of layout design & expected yield<\/h4>\n

We review the existing layout design and the yield assumptions from a yield simulation \/ yield report<\/a> for plausibility. For this purpose, the system - including the selected structural components - is transferred into our software, assessed, and compared with the existing yield report.<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n

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Review of AC electrical design<\/h4>\n

We review the electrical design, including the selected grid connection components such as transformers, route cables, and metering, protection, and control technology. We also closely examine the plant IT concept and the secure connection of the system to the relevant monitoring, marketing, and control units. In addition, we determine whether all technical standards and requirements relevant to the project have been considered in the detailed design.<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n

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On-site inspection of construction and installation quality<\/h4>\n

For existing systems, we inspect the project on site, including layout, installed components, and DC and AC execution. We compare the implementation with the \u201cas-built\u201d documentation. In addition, we carry out visual inspections for structural defects, signs of degradation, or weather-related damage. If required, a thermography inspection can also be used. The monitoring and control system (SCADA), including control technology, is also analysed and assessed.<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n

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As needed: extended analyses & reports <\/span>within the TDD<\/h3>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n
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Design review of execution planning<\/h4>\n

As part of a Technical Due Diligence, we can carry out independent design reviews of existing or third-party system designs upon request. In our role as Owner\u2019s Engineer, we systematically review the execution planning for technical quality, compliance with standards, and operational practicality. To do so, we analyse DC- and AC-side electrical planning, the selection and sizing of main components, as well as protection, control, and metering concepts, and benchmark them against applicable standards, manufacturer specifications, and best-practice standards. We also incorporate our operations experience to assess maintenance- and OPEX-relevant aspects\u2014such as the placement of inverters and stations. This makes planning risks, optimisation potential, and possible impacts on yield, operations, and profitability transparent at an early stage. <\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n

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Thermography inspection<\/h4>\n

Within Technical Due Diligence, we use thermography inspections<\/a><\/span> as a targeted supplementary analysis tool for the objective assessment of the technical condition of the system. For new systems, it is typically carried out during commissioning or shortly beforehand to identify installation errors, hotspots, or faulty connections early and to rule out hidden defects before operations begin.<\/p>\n

For existing systems, thermography serves as a robust status quo analysis. It reveals thermal anomalies, signs of degradation, or gradual defects that may result from operation, ageing, or earlier execution errors. The results feed into the overall assessment of the system and support well-founded decisions, for example before warranty expiry, during transactions, or with regard to revamping or repowering measures.<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n

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End-of-warranty inspection<\/h4>\n

End-of-warranty TDD is carried out shortly before warranty or guarantee periods expire and serves to objectively assess the technical condition of the system. The aim is to identify potential defects in time and safeguard justified claims against EPCs, manufacturers, or suppliers.<\/p>\n

Existing documentation (\u201cas-built\u201d) is reviewed against the realised system condition, including mechanical and electrical design on the DC and AC sides, as well as key assumptions such as layout design and component selection. An on-site inspection records installation deviations, visible damage, and initial signs of degradation. Optionally, a thermography inspection supplements the review with thermal anomalies. In addition, operational and monitoring data are included in the assessment to identify performance deviations or recurring faults. The results are summarised in a structured final report and provide a robust basis for warranty claims or decisions on continued operation.<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n

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Why work with greentech<\/span>?<\/h2>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n
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Years of experience<\/h3><\/div>\n<\/div>\n\n
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Employees active in 6 European countries<\/h3><\/div>\n<\/div>\n\n
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Projects in the development pipeline<\/h3><\/div>\n<\/div>\n<\/div>\n\n
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Ground-mounted PV systems built<\/h3><\/div>\n<\/div>\n\n
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in technical consulting<\/h3><\/div>\n<\/div>\n\n
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in operational management<\/h3><\/div>\n<\/div>\n<\/div>\n\n
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Your specialists for
\nTechnical Due Diligence<\/span><\/h2>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n
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\"Expert:<\/span><\/div>\n<\/div>\n\n
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Viola Hoffmann<\/h5>

Commercial Head of Engineering<\/p>

As Commercial Head of Engineering at greentech, Viola Hoffmann is responsible for the commercial management of the engineering department. In her role, she connects technical project requirements with economic implementation \u2013 from offer and project costing to the further development of suitable commercial services within the engineering context. Viola Hoffmann has been active in the solar industry since 2017. She studied European Studies as well as International Business Administration and Politics (among others in the Netherlands and Copenhagen) and also brings experience from entrepreneurship and working in young, dynamic companies.<\/p>\n<\/div><\/div><\/div>\n<\/div>\n<\/div>\n\n

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\"Experte:<\/span><\/div>\n<\/div>\n\n
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Johannes Liebich<\/h5>

Head of Engineering & Technical Advisory<\/p>

Johannes Liebich ist Leiter des Teams \u201eEngineering & Technical Advisory\u201c bei greentech. Er ist verantwortlich f\u00fcr die Planung und Umsetzung von Projekten, sowie die Entwicklung neuer Leistungen in der technischen Anlagenberatung. Johannes Liebich studierte Environmental Engineering mit dem Schwerpunkt Photovoltaik und ist seit 2011 in der Solarbranche t\u00e4tig. Als erfahrener Technical Advisor liegt sein Schwerpunkt vor allem im Bereich Anlagenbau und -betrieb.<\/p>\n<\/div><\/div><\/div>\n<\/div>\n<\/div>\n\n

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J\u00f6rn Carstensen<\/h5>

Chief Technical Officer (CTO)<\/p>

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In seiner Rolle als CTO b\u00fcndelt J\u00f6rn Carstensen die Leitung aller technischen Bereiche der greentech Gruppe. Er ist verantwortlich f\u00fcr Anlagenbau, Engineering Services und Technisches Management. Ziel ist es, einheitliche Standards und Prozesse in allen technischen Bereichen bei greentech zu schaffen und so unternehmensweite Synergien, hohe Qualit\u00e4t und gr\u00f6\u00dftm\u00f6gliche Transparenz sicherzustellen.<\/p>\n

J\u00f6rn Carstensen kam 2014 als Business Development Manager zu greentech. Neben der Erschlie\u00dfung verschiedener europ\u00e4ischer M\u00e4rkte baute er den Bereich Engineering & Technical Advisory auf. Von 2006 bis 2014 war er f\u00fcr die Conergy Group in verschiedenen internationalen Funktionen im Corporate und Business Development t\u00e4tig. Zuvor arbeitete er f\u00fcr eine Beratungseinheit von Accenture und unterst\u00fctzte Versorgungsunternehmen bei strategischen und organisatorischen Fragestellungen. J\u00f6rn Carstensen hat Wirtschaftsingenieurwesen mit Schwerpunkt Energie- und Umweltmanagement an den Universit\u00e4ten Flensburg und Southampton studiert.<\/p>\n<\/div>\n<\/div><\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n

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Contact<\/h2>\n<\/div><\/div>\n<\/div>\n\n
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Only 45 seconds for your request<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n

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