Logo Fronius

Fronius Reserva - The new generation of high-voltage storage systems for maximum independence


With the Fronius Reserva, Fronius presents a new generation of high-voltage batteries that combine self-consumption optimization, emergency power capability and maximum efficiency in a single system. This DC-coupled storage system was specially developed for Fronius hybrid inverters and ensures that solar energy can be stored intelligently and used around the clock - for greater independence and lower energy costs.

Thanks to lithium iron phosphate (LFP) technology, the Fronius Reserva offers maximum safety, a long service life and maximum performance. The scalable capacity of 6.3 to 15.8 kWh, expandable up to 63 kWh, makes it the perfect solution for private households, businesses and farms that want to take their energy future into their own hands.

A particular highlight is the integrated emergency power and black start capability, which ensures a reliable power supply even in the event of grid failures. With Fronius Solar.web, the storage system can be seamlessly integrated into the PV system and monitored in real time at any time. There is also a special advantage in terms of data protection: all data is stored exclusively on European servers - for maximum security and transparency.


With the Fronius Reserva, Fronius is setting new standards for high-performance, flexible and future-proof energy storage. Anyone looking for an efficient, expandable and perfectly coordinated storage solution will find the ideal solution for a sustainable and independent energy supply. The storage system is available from May and offers an efficient, expandable and perfectly coordinated solution for a sustainable and independent energy supply.
Read more

Fronius Reserva - High-voltage battery for maximum independence

The Fronius Reserva is a DC-coupled high-voltage battery that has been specially developed for use with Fronius hybrid inverters. It enables efficient storage of solar energy to maximize the self-consumption of a PV system and ensure a reliable power supply. Thanks to its modular design, the battery can be flexibly scaled and adapted to individual energy requirements.

Why the Fronius Reserva?

  • Maximum efficiency - DC coupling minimizes charging and discharging losses, ensuring high economic efficiency.
  • Flexible expansion - Scalable storage capacity from 6.3 kWh to 15.8 kWh with up to five battery modules, expandable by connecting several batteries in parallel (up to 63 kWh).
  • Safe lithium iron phosphate technology (LFP) - High operational reliability without thermal runaway.
  • Compatibility with Fronius hybrid inverters - Optimum integration with Fronius GEN24 Plus for efficient control of the energy system.
  • Durable & reliable - 10-year warranty for long-term safety.
  • Emergency power & black start capable - The Fronius Reserva can serve as an emergency power supply and support the operation of a PV system even in the event of a grid failure.
  • Space-saving design - Compact design (IP65, -20 to +55 °C), ideal for confined spaces such as garages or utility rooms.
  • European data security - All data is stored exclusively on European servers, compliant with the highest security standards (ISO27001).
  • Convenient monitoring - Fronius Solar.web enables simple real-time monitoring of energy consumption, state of charge and feed-in.

Technical highlights

✔ Usable capacity: 6.31 kWh - 15.79 kWh (expandable by parallel connection up to 63 kWh)
✔ Nominal voltage: 204.8 V - 512 V
✔ Voltage range: 185.6 - 568 V (depending on the number of battery modules)
✔ Protection class: IP65 (protected against dust & water)
✔ Battery chemistry: Lithium iron phosphate (LFP)
✔ Operating temperature range: -20 °C to +55 °C
✔ Maximum number of parallel batteries: 4
✔ Weight: 86.6 kg - 187 kg (depending on number of modules)
✔ Installation location: Indoor and protected outdoor area
✔ Communication: RS485 interface for easy monitoring

Optimum energy management & monitoring
  • Seamless integration with the Fronius Solar.web app to monitor energy consumption, state of charge and feed-in in real time
  • Secure data storage exclusively on European servers for maximum data protection standards
  • Easy system integration without additional third-party software, ideal for efficient management of your PV system.


Which Fronius inverters are compatible?

The Fronius Reserva has been specially developed for smooth integration with the following inverters:
  • Fronius GEN24 Plus - Hybrid inverter for self-consumption optimization and emergency power supply
  • Fronius Symo Hybrid - Ideal for grid-connected systems with storage integration

Conclusion - Powerful performance for sustainable energy independence

The Fronius Reserva impresses with efficient DC coupling, safe lithium iron phosphate technology and perfect coordination with Fronius inverters. Thanks to the integrated monitoring solutions and high scalability, it offers a future-proof solution for households and companies that want to make the best possible use of their solar energy.

Discover more storage solutions from Fronius, including the Fronius GEN24 Plus series for hybrid solutions and the Fronius Primo series for smart charging of electric vehicles!

Frequently asked questions

  • How long are Fronius warranties?
    The manufacturer's warranty is 2, 5 or 10 years, depending on the product series. For more detailed information on the warranty period, please refer to the data sheet provided with the respective product.
  • What is Fronius' production volume?
    With a production volume of around 32,000 inverters per month in 2022, Fronius aims to increase this by more than 65% to over 52,000 inverters per month by the end of 2023. Thus, investments in the expansion of operations, compared to 2022 at 187 million euros, are also to be increased to more than 230 million euros. 
  • Where does Fronius produce?
    The company has been producing in its own production facility in Austria since its foundation. 
  • Where is the company located?
    Fronius now operates on five continents worldwide with its 37 subsidiaries, although the main concentration of locations is still in Europe. In addition, the sales and service partners are represented in over 60 countries on all continents, so that optimum support can be guaranteed around the globe. 
  • What products does Fronius specialize in?
    Fronius specializes within the photovoltaic industry in the production of inverters and electricity meters. 
  • When was Fronius founded and what are they known for?
    In 1945, the Fronius company was founded by Günter Fronius, a trained electrical engineer, in Pettenbach, Austria, as a one-man operation for radio and electrical maintenance work. Fronius' fame continued to grow through the invention of simple battery chargers, and welding transformers have been part of the company's portfolio since 1950. Over the years, the company continued to expand, entering the solar business in the 1990s. Now run by the 3rd generation of the Fronius family, the headquarters are still in Pettenbach, Austria, whose mainstays today are solar energy, welding and battery charging technology.