PV Firefighter Switches Planning with the QFire Configurator
QFire Configurator for the technical pre-planning of your PV generator disconnection system. Plan firefighter switches online.
QFire Configurator for the technical pre-planning of your PV generator disconnection system: PV firefighter switches planning now
With the QFire Configurator, you can pre-plan PV firefighter switches for commercial and industrial photovoltaic systems in a structured way. The tool guides you step by step through the key technical data of your system – from the number of PV strings and the MPPT assignment to surge protection, fuses, roof areas and optional accessories.
This creates a solid basis for the subsequent technical review by Q3 ENERGIE. Especially for larger PV systems with several inverters, many strings or complex cable routing, this saves time during technical coordination and reduces queries in the quotation phase.
Correctly designing firefighter switches for PV systems
A PV firefighter switch is not a component that is simply selected according to the system size in kWp. The actual system structure is decisive: the number of strings, system voltage, maximum string current, position of the DC cables, inverter structure and the requirements resulting from the fire protection concept, operator specifications or insurance requirements.
The QFire Configurator helps collect this data in a structured way. Instead of gathering individual details from plans, datasheets and emails, the relevant information is requested directly during the planning process. This simplifies the technical assessment and ensures that the later QFire solution matches the actual PV system layout.
What does the QFire Configurator ask for?
In the configurator, you enter the most important data for the PV system. This includes the number of PV strings, the assignment to inverters and MPP trackers, possible roof areas or generator fields, and the required equipment of the QFire switch boxes.
Depending on the project, surge protection, fuses in the positive and/or negative pole, external disconnection points, key switches, emergency stop buttons, connection to a fire alarm system or cluster solutions can also be taken into account. This allows even larger systems with several disconnection areas to be prepared in a much more structured way.
Which systems is the QFire Configurator designed for?
The QFire Configurator is aimed primarily at planners, installers, EPCs, project developers and technical decision-makers who want to pre-plan PV firefighter switches for commercial or industrial photovoltaic systems.
The tool is particularly useful for systems with many strings, several inverters, long DC cable routes, multiple roof areas or special requirements regarding disconnection, accessibility and status indication. Even if not all project details are final yet, the configurator provides a useful first structure for the technical planning process.
PV Firefighter Switches Planning: Why QFire?
Scalable for many strings
QFire BIG is a PV generator disconnection system for DC-side string disconnection and is designed for larger string quantities. Depending on the version, one switch box can accommodate up to 24 PV strings.
Suitable for 1,500 V DC systems
The switch boxes are designed for modern high-performance PV systems with up to 1,500 V DC system voltage and up to 20 A Isc per string.
Generator-side DC disconnection
Disconnection takes place where it makes technical sense: close to the PV generator, from the switch box towards the inverter. Galvanic and arc-free.
Modular project-specific planning
Surge protection, fuses, emergency stop, key switch, status contact, fire alarm system connection or the integration of AC-side disconnection via potential-free contact can be taken into account on a project-specific basis.
Suitable for multiple roof areas
With cluster solutions, even more complex system structures with several roof areas or building sections can be represented clearly and technically correctly.
Automatic reconnection
In the event of a grid failure, QFire automatically disconnects the PV strings. Once grid voltage returns, the system is automatically reconnected.
Made in Kaufbeuren
QFire is planned, built and tested on a project-specific basis at Q3 ENERGIE – with short communication paths between engineering, production and technical support.
Safe planning and documentation
With project-specific design, datasheets and documentation according to IEC 60947-3, QFire can be integrated cleanly into planning, tender documents and technical documentation.
Technical data and documents
Technical documents, datasheets, certificates, installation manuals and further documentation are available for the next planning steps. This information is particularly relevant for planners, tendering departments, installers and technical buyers when pre-planning becomes a concrete tender or project enquiry.
The most important documents can be found in the section Technical downloads QFire IEC 60947-3.
PV firefighter switches planning: technology and background
If you would first like to learn more about the function, application areas and technical requirements of PV firefighter switches, we recommend our technical overview page on PV firefighter switch technology.
There we explain why purely AC-side disconnection in PV systems does not automatically mean that the DC cables are de-energised, and what role generator-side DC string disconnection can play in PV firefighter switches planning.
PV firefighter switches planning now
The QFire Configurator is the guided option for your technical pre-planning. Inverter structure, MPP trackers, number of strings, roof areas, surge protection, fuses and accessories are requested step by step and displayed in a clear, transparent structure.
This creates a traceable basis for the further review by Q3 ENERGIE. The configurator is AI-supported; the final technical assessment is still carried out by our team.
Would you prefer to submit a classic enquiry, download technical documents or first read more about how the system works? The following sections take you directly to the right page.
Project Inquiry Firefighter Switch
Classic enquiry for prepared projects: with free-text information, project data and upload option for plans, inverter data or tender documents.
Technical Documentation Firefighter Switch
Data sheets, certificates, and technical documentation for QFire BIG and LITE, control boxes, switch boxes, and accessories.
Function + Technology
QFire
Technical fundamentals of DC-side disconnection, system design, triggering methods, galvanic isolation, and standards-compliant implementation.
FAQ on Firefighter Switches
Answers to frequently asked questions about application, standards, triggering concepts, mandatory requirements, and operation of firefighter switches in PV systems.