High Frequency Analysis

Our new power quality, high-frequency analysis method provides transparency in terms of network-related fall-outs and wear and tear of components in your plant.

A high frequency analysis allows you to go into great detail in order to get to the bottom of the causes of wear and failure with your photovoltaic system.

High-frequency analysis reveals hidden and
avoidable stresses on plant components

New high-frequency analysis measures currents, voltages and resonances up to 150 kHz

When components of a PV system fail, it could be due to harmonic distortions in the electrical network. These can have a major impact on the connected equipment by restricting functions, which greatly accelerates the wearing and aging processes of the components. This results in recurring repair costs due to failures and defects, although the exact causes often remain unclear.

High transparency of network topography

Thanks to a high sampling rate, our analysis determines impedances, even in the high-frequency range up to 150 kHz. In contrast to common standard measurements, this opens up completely new and much more detailed insights into the nature and quality of the network and the resulting challenges for the plant.

Derive and implement measures for trouble-free, long-term plant operation

The knowledge gained from the measurements we take can be used to derive indications of defective components, which can then be replaced in the next step and designed according to the existing grid conditions. In the case of new plants, for example, recommendations for action can be derived and implemented for the filter design of inverters before major damage occurs. Furthermore, it is possible to find out whether sources of interference outside the PV system have a negative influence on the operation of the system.

The advantages of our power quality, high-frequency analysis

Utility poles on a field connected to a commercial pv plant running through a power quality check

Power Quality Check: Checking the network quality

Get to the bottom of frequent failures or recurring defects in your plant:

  • Uncover causes of frequent, recurring failures in specific plant components
  • Obtain transparency in terms of overloading of certain components
  • Enable effective protective and preventative measures
  • Reduce repair costs and yield losses
Glowing electronic finger print of a high frequency analysis

Electrical Fingerprint

Focus on plant health right from the start, to ensure the basis for a long and efficient service life:

  • Reduces wear and overloading of new equipment from the offset of your PV project
  • Ensures longer intervals between maintenance, thereby reducing costs
  • Provides transparency regarding the condition of your plant post-construction
  • Enables objective plant evaluation, ideal in case of the potential sale of the plant
Measurements with recognizable target vs. actual deviations during a high frequency analaysis

Example: Measurements with recognizable target/actual deviations

Target behavior: redActual behavior: blue

Magnitude of the measured grid impedance at an inverter with intact filter capacitance (red curve) and defective filter capacitance (blue curve).

When does a high frequency analysis make sense?

A high frequency analysis provides insight into power quality in unprecedented detail, enabling you to locate the network-related source of downtimes that have not been found thus far.

We can help you uncover the causes of recurring failures and overloading of specific plant components, so you can take effective protective and preventative measures, which will reduce both repair costs and yield losses.

We take measurements to determine indications of defective components, which can be replaced or designed according to existing grid conditions. In the case of new plants, recommendations can be made and implemented for the filter design of inverters before major damage occurs. It is also possible to find out whether sources of interference outside the PV system have a negative influence on the operation of the system.

A high frequency analysis will enable you to offer an objective plant evaluation to any prospective buyers of your solar power plant. Transparency on the condition of your plant will allow you to build trust and ensure both parties are satisfied with the outcome of a potential sale.

We take detailed measurements of currents, voltages and impedances in the high-frequency range, and prepare a comprehensive report of the results, including an evaluation of normative specifications for the low frequency range.

Thanks to an extremely high sampling rate, our analysis determines electrical impedances, even in the high-frequency range up to 150 kHz. This opens up new and much more detailed insights into the nature and quality of the network, and the resulting challenges faced by the plant.

Why is our high frequency analysis so unique?

Solar modules on a field facing power loss due to an undetected failure in the elecrtical grid

An industry first, exclusive to greentech

Our high frequency analysis methods are the first of their kind, and they provide you with a level of detail impossible to find anywhere else in the PV industry. This ensures the performance and success of your plant in the long term.

Developed for you by a strong and
experienced team

Together with the engineers and grid specialists from morEnergy , we want to take the issue of power quality for photovoltaic systems to the next level. This is because we believe that a review of the normatively prescribed frequency range of up to 9 kHz will no longer be sufficient to ensure good power quality for the system and the grid in the future. The reasons for this lie in the expansion of the decentralised power supply through renewable energies and the increase in the high frequency levels of pulsing system components.

greentechs partner Morenergy with whom they developed the high frequency analysis for the photovoltaic sector
greentech IT equipment and tools to realize a high freqeuncy analysis

Detection of problems which would otherwise be impossible with standard analyses

We can detect hidden and avoidable stresses on plant components with innovative, game changing methods, so you can focus on plant health right from the start and ensure that your solar farm has a long and efficient service life.

High frequency analysis for photovoltaic systems, PQ Check
and Electrical Fingerprint

Our Services: Measurement, analysis and evaluation

Measurement of currents, voltages and impedances in the high-frequency range.

  • Measurement points usually on the low-voltage side of the transformer station
  • Scope depending on the number of transformer stations and inverter layout
  • Scope depending on the respective system type and the installed components

Data acquisition and transmission by the Online Network Impedance Spectrometer “ONIS 690 V

Analysis of the data and evaluation of the results of measurements

Preparation of a report with the following content:

  • consideration and evaluation of normative specifications for the low frequency range
  • definition and comparison of further limit values in the high-frequency range
  • evaluation of anomalies according to relevance, in the form of a traffic light system, with corresponding recommendations for action


The price is merely a guideline, which does not include travel expenses. It includes the effort for plants between 1 and 3 MW, with 4 measuring points. We are aware that every plant is different, so we will work out an individual measurement concept specifically for you, taking into account the type of plant you have, as well as the installed components and known problem areas.

High Frequency Analysis

from EUR 2,950

Why work with greentech?

we service | new energy

600 MWp managed &
1 GW inspected

Over 60 employees, including
TÜV/VdS certified experts

Experience from 250+
projects and 12 countries

About greentech

Expertise Every Step of the Way – Across All Project Phases

greentech is a service company with locations in Hamburg, Leipzig and Milton Keynes in the UK, specializing in the engineering and operational management of photovoltaic systems. With an interdisciplinary team of experienced experts, we provide a full-service operation management concept for PV systems of all sizes, as well as services for planning, quality assurance and yield maximization. We work independently of component manufacturers and general contractors and thus exclusively represent the interests of the plant owners.

With a comprehensive range of services and a current portfolio of more than 600 MWp, we are one of the largest independent service providers worldwide. greentech’s growing customer base includes private plant owners as well as municipal utilities, regional and international energy providers, project developers, insurance companies and investment funds

Your greentech specialists for a professional high-frequency analysis

Steffen Heberlein
Steffen Heberlein

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.
Carsten Weis
Carsten Weis

Manager, Field Services

Carsten Weis is the Head of Field Services at greentech and coordinates the deployment of technicians when repairs are needed. As the first point of contact for second-level support and quality management, he also works on the systems himself. Furthermore, he is a responsible electrician (VEFK) and VdS-certified assessor for photovoltaic systems. The master electrician has been working in the PV industry since 2007 and has extensive knowledge in the area of electrical installation of all PV components.