Feasibility analysis for PV roof systems

How feasible and how profitable is the implementation of a PV system on your company or warehouse roof? We answer this question!

With technical support during the construction phase, we offer you a fully comprehensive service package for your photovoltaic project to ensure the quality of execution and the conformity with the planning documents.

PV roof system as a sustainable investment to reduce the electricity bill

More and more companies with large offices, production facilities or warehouses are using their roof areas for installation of PV systems to save electricity costs in the long term and to sustainably reduce their CO2 contribution. In some countries it is even mandatory to implement a PV system on the roof when constructing new commercial and industry buildings. It is also possible to lease the roof area to an external operator of the PV system for this purpose. In addition, storage solutions are increasingly being used. They make it possible to use a larger share of the self-produced PV electricity and thus increase independence from the currently rising electricity prices.

With our PV feasibility analysis, we offer you a technical assessment of the available roof area and the electrical integration into the building. You will receive an estimate of the energy production of the PV system, the expected CO2 savings and the expected economic payback period.

To estimate the expected electricity production, we use 3D planning software and create an optimised plant layout of the respective roof using a proven system design. By adding specific irradiation data of the area, the amount of electricity generated can be determined very precisely. With information on your current electricity consumption and your load profile, we can calculate how much of the electricity for the building can be generated by the PV system and directly used by the building and how much excess PV power is exported into the grid.

When does a feasibility analysis make sense?

We analyse your roof area(s) and provide you with a sound assessment of the economic viability of a PV system for your roof. Our analysis is based on a proven design, the use of site-specific irradiation data and the derivation of the resulting electricity yields.

We look at your roof surface(s) from a technical point of view and also take the individual conditions on site into account. To do this, we analyse the roof condition and load-bearing capacity, space conditions and restrictions due to pipelines or ventilation shafts as well as external shading, for example from trees or other buildings. This may also result in the conclusion that a roof surface is economically not suitable for the installation of a PV system.

As experts in operational management and PV system design, we provide you with a well-founded forecast of the expected yields of your potential rooftop system. We develop an individual plant layout for your roof based on a proven system design and an irradiation simulation based on local data. In the next step, we calculate how much of the PV electricity produced is consumed directly and how much excess power can be fed into the grid.

As a full-service PV provider, we benefit from a wealth of experience with regard to the costs incurred in the construction and operation of PV systems. We use realistic benchmarks for our calculations, combined with the specific system size, the components installed and other specific installation costs. For the amortisation, it is also relevant whether you use the produced electricity yourself or feed it into the public grid. There are various operations models possible, which we are considering: from feed-in-tariffs, self-consumption, power purchase agreements or a combination of these

The Levelised Cost of Electricity (LCOE) indicates the production costs of PV electricity and is a good parameter for assessing the profitability of a solar installation. It consists of the life-cycle costs (acquisition costs, operating and repair costs), which are set in relation to the total energy production over the lifetime of the system. If the total electricity production costs of a planned system with complete self-consumption are lower than the estimated electricity purchase price, the business case will be positive. This analysis is an integral part of our feasibility study and therefore shows the profitability of a solar plant.

Storage solutions offer the option of not feeding the electricity produced directly into the grid, but of storing it and being able to use it later. By using it yourself, you need to purchase less electricity from external sources. In times of rising electricity costs, this solution can pay for itself in a short time. We calculate when you will reach this point.

We offer the additional consideration of storage solutions individually on request.

Applied added value and full transparency


Only feasible or also profitable?

We offer the transparency you need to find out whether a solar system on the roof is economically viable for you. How we come to our conclusion is presented in a comprehensive report. We generate our information through the use of proven 3D planning and simulation programmes as well as our many years of experience in the areas of project development, system planning, operational management and our work as expert for PV yield assessments. In the end, we tell you not only whether a PV plant is feasible on your roof, but also how profitable it will operate.

Individual consideration and advice for the best possible, realistic result

Every system is different and is influenced, among other things, by the available (roof) area. Therefore, we clarify in advance which goals you are pursuing with a PV system and how you would like to use your generated electricity later. In addition, we ask for certain framework data and advise you in case of questions or uncertainties. To determine the best possible, but also realistic results for you, in addition to our specific PV knowledge and experience, we also need information about your building: These are construction plans, structural information, an overview of the electrical infrastructure and, if applicable, load profile data on your energy consumption.


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Basis for a possible implementation later

The system design carried out in the feasibility analysis represents the first step towards your PV system – you already have a concrete layout proposal at hand. You can use this as a basis for the following detailed planning and tender process or as a starting point for determining further optimisation potential.

Discover our full scope of services for your feasibility analysis

Technical analysis of the available roof area including shading objects

Determination of the additional roof load and comparison with the structural reserve loads of the roof

Analysis of the electrical infrastructure for integration of a PV system

Initial system design and layout planning

Site-specific simulation of the expected solar electricity yields

Load profile analysis: determination of future PV self-consumption as well as excess PV electricity generation for grid feed-in

Calculation of future CO2 savings

Estimation of the required investment costs

Determination of the PV Levelized Cost of Electricity (LCOE)

Detailed report on the technical and economic aspects of the assessment (e.g. payback period)

Optional: Consideration of storage solutions

Why work with greentech?

we develop | we build | we service | new energy

1+ GW managed &
1+ GW inspected

100+ employees, including
TÜV/VdS certified experts

Experience from 400+ projects
and 10 countries

About greentech

Expertise Every Step of the Way – Across All Project Phases

greentech is an integrated PV specialist. The range of services includes project developmentsystem design, construction, operation and management of PV power plants in Europe. In the area of operational management, we offer a full-service operational management concept for PV plants of all sizes with an interdisciplinary team of experienced experts, as well as services for planning, quality assurance and yield maximisation. With a comprehensive range of services and a current portfolio of more than 900 MWp in O&M, we are one of the largest independent service providers worldwide.

Your greentech specialists for professional area analysis

Steffen Heberlein

Senior Project Manager Sales & Business Development

Steffen Heberlein is responsible for the expansion of the business units Technical Operations Management, Commercial Operations Management and Technical Advisory. His activities for greentech’s customers range from price indications to contract negotiations and project implementation support. As a key account manager, he also looks after more than 250MWp for various customers in greentech’s existing portfolio.
Johannes Liebich

Head of Engineering & Technical Advisory

Johannes Liebich is head of the “Engineering & Technical Advisory” team at greentech. He is responsible for the planning and implementation of projects as well as the development of new services in technical plant consulting. Johannes Liebich studied Environmental Engineering with a focus on photovoltaics and has been working in the solar industry since 2011. As an experienced Technical Advisor, his main focus is on plant construction and operation.

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