DEHN protects PV systems
DEHN protects photovoltaic systems

Protect photovoltaic systems from direct lightning strikes and transient overvoltages

Secure the availability of the PV system

Surge damage due to a thunderstorm is one of the most frequent causes of damage in PV systems

Surges often lead to the destruction of system parts such as modules, inverters and monitoring systems. The financial consequences are dire. Replacement of a faulty inverter, new installation of the PV system, loss of revenue resulting from downtime… all mean that the break-even point and thus the profit zone is reached much later.

Decide in favour of a professional and comprehensive lightning protection system
consisting of

  • External lightning protection with an air-termination and down conductor system
  • Internal lightning protection with surge protection for lightning equipotential bonding,

In doing so, you increase system availability and secure your revenue in the long term.

Rooftop PV systems

Professional planning with a concept

One of the most common forms of PV systems is the rooftop system. Due to its exposed position, it is particularly prone to damage caused by direct and indirect lightning effects.

Comprehensive protection is therefore required.

Take a look at some practical solutions for three different application scenarios:

  • Buildings WITHOUT external lightning protection
  • Buildings WITH external lightning protection AND sufficient separation distance
  • Buildings WITH external lightning protection but WITHOUT sufficient separation distance

PV free-field systems and solar parks

Protection against direct lightning strikes and transient overvoltage

A lightning protection system for free field systems and solar parks has two main goals:

  • Protecting the power plant area from lightning-related damage 
  • Protecting the modules, inverters and monitoring systems from the effects of electromagnetic impulses.

Have a look at some possible configurations here for a "centralised configuration with central inverter" or the "distributed configuration with string inverter".

FAQ Photovoltaic

Find answers to frequently asked questions concerning lightning and surge protection for photovoltaic systems.

Electric battery storage systems

Battery storage systems store the excess energy produced by PV systems and feed it back into the grid when required. This counterbalances fluctuations and peak loads in the power supply network.

Surges, direct lightning strikes and grid-related voltage peaks put your battery storage system at risk.

Minimise expensive maintenance and repair work. Safeguard the availability of your storage system. With a customised lightning and surge protection concept.

Arc Fault Protection

Protect employees - optimise system availability

An arc fault protection system provides you with the safety and assurance you need to effectively protect your employees, to optimise the availability of the switchgear assembly and to conduct your planning in line with the valid regulations. Depending on the purpose and energy density of the switchgear assembly, different protection systems are available to suit the particular situation and type of system.

DEHNshort: this active arc fault protection reacts directly in the switchgear assembly.
DEHNcare personal protective equipment (PPE) protects your employees and is both comfortable to wear and safe.

Safety Equipment

Working on PV systems under DC voltage

Photovoltaic modules generate voltages up to 1500 V direct current. Therefore, they by far exceed the "dangerous value" of 120 VDC specified in the German accident prevention regulation BGV A3.

Safety first

With DEHN safety products for installation and maintenance the safety of your workers is the top priority. Protect your service staff during work on rooftop systems and solar parks.


Have you got any questions? Contact us.

Technical support ⎟ Photovoltaics

T. +49 9181 906 1740

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