Fronius Reserva Energy storage

Be independent and use your solar energy around the clock. The Fronius Reserva is a high-voltage battery with DC coupling that ensures particularly effective and efficient energy transfer.

With capacities from 6.3 to 15.8 kWh with two to five modules, it adapts flexibly to your needs. Perfectly matched to Fronius hybrid inverters, it integrates seamlessly into your photovoltaic system. Your data remains secure because it is stored exclusively on European servers. The proven Fronius Service & Support is always on hand to provide fast and reliable assistance for your entire system.

Experience freedom, security and efficiency in a perfectly designed complete system.

One-stop-shop

Fronius now offers all the components for 24 hours of sun - a complete PV system from a single source. With the Fronius Reserva, we are adding a powerful battery to our portfolio that perfectly complements your energy system. Everything is ideally matched, saving you time and ensuring smooth processes. The optimal interaction of our devices ensures efficient and reliable operation. Service is also straightforward: a single point of contact is all you need. With the Solar.web app, you can keep an eye on all your Fronius devices, such as the Reserva, the GEN24 Plus hybrid inverter and the Wattpilot Flex wall box, without the need for additional third-party tools. Add to that the security of the Fronius warranty and the quality of a company with over 80 years of experience.

Maximum efficiency, maximum independence

Experience maximum independence with the Fronius Reserva! Thanks to DC coupling, the energy from your PV system is charged into the battery with almost no loss - for maximum efficiency and full power. The high-voltage technology optimises the cost-effectiveness of your system. Combined with the GEN24 Plus, you benefit from exceptional charge and discharge performance, making the most of even short windows of sunshine. With lithium iron phosphate cell chemistry, the Fronius Reserva is built to last and offers you reliable security.

European data security

With Fronius Reserva, you can keep an eye on your data at all times - safely and securely. Our Solar.web monitoring platform visualises all important information and complies with all data protection regulations. Your data is only stored on European servers.

Fronius adheres to the highest security standards: we meet the latest information security standards (ISO27001) and have regular security audits carried out by renowned companies. In addition, secure coding training is mandatory for our software developers to ensure the best possible protection for your data.

Fronius Reserva Discover the highlights of the smart high-voltage battery

Backup power capability The Reserva is capable of backup power and black starts – it charges and discharges even during a power outage. This way, you remain independent and reliably supplied, even in emergencies.

Status display The battery status indicator shows you important information such as charge level or battery status right on the device.

Guaranteed performance Fronius guarantees that after 10 years, at least 80% of the battery capacity of the Reserva will still be usable.

Slim, space-saving design The Fronius Reserva impresses with its slim design and robust construction (-20 to +55 °C). It fits into the tightest of spaces, such as garages, and offers maximum installation flexibility.

Maximum adaptability The Fronius Reserva modules are easy to stack - from 6.3 to 15.8 kWh per tower. For larger storage capacities, you can connect up to four towers in parallel and achieve up to 63 kWh - without any additional devices such as combiner boxes.

Backup power capability

The Reserva is capable of backup power and black starts – it charges and discharges even during a power outage. This way, you remain independent and reliably supplied, even in emergencies.

Status display

The battery status indicator shows you important information such as charge level or battery status right on the device.

Guaranteed performance

Fronius guarantees that after 10 years, at least 80% of the battery capacity of the Reserva will still be usable.

Slim, space-saving design

The Fronius Reserva impresses with its slim design and robust construction (-20 to +55 °C). It fits into the tightest of spaces, such as garages, and offers maximum installation flexibility.

Maximum adaptability

The Fronius Reserva modules are easy to stack - from 6.3 to 15.8 kWh per tower. For larger storage capacities, you can connect up to four towers in parallel and achieve up to 63 kWh - without any additional devices such as combiner boxes.

Additional information for installers

Proven Fronius Service & Support

Our technical support team offers comprehensive troubleshooting for the Fronius Reserva, as they can view all relevant system data (inverter and battery). For other compatible storage systems, in many cases the manufacturer has to be referred to. With the Fronius Reserva, we can take care of everything from a single source – quickly and easily. Fronius offers technical telephone support in several time zones and national languages. In addition, our online self-service tool Solar.SOS is available to installers around the clock.

With a comprehensive network of Fronius partner companies, we ensure that our customers receive a smooth and timely replacement when servicing is required.

Your complete Fronius package

The heart of your PV system

With the Fronius GEN24 Plus you can have 24 hours of sun in your home. That's because the hybrid inverter allows you to connect a battery storage system, making you even more independent.

Full solar power for your energy transition

Backup power for every situation

With the Fronius Backup Controller & Backup Switch you can switch to full backup power generation either automatically or manually. These cost-effective switching components can be installed in the control cabinet to save space and eliminate the need for additional hardware such as switch boxes.

More about the Fronius backup power portfolio

Everything under control

With our Fronius Solar.web monitoring tool, you can keep an eye on your PV system anytime, anywhere, and keep your energy transition optimally on track – easily and conveniently on your smartphone or on the web.

Discover Solar.web features

Technical data & downloads

Data	Reserva 6.3	Reserva 9.5	Reserva 12.6	Reserva 15.8
Usable capacity	6,31 kWh	9,47 kWh	12,63 kWh	15,79 kWh
Number of battery modules	2	3	4	5
Rated voltage	204,8 V	307,2 V	409,6 V	512 V
Voltage range	185,6 ~ 227,2 V	278,4 ~ 340,8 V	371,2 ~ 454,4 V	464 ~ 568 V
Maximum output current¹	32
Battery cell chemistry	Lithium iron phosphate (LFP)
Parallel operation	up to 4 batteries
Dimensions (height x width x depth)	860 x 780 x 176 mm	1100 x 780 x 176 mm	1360 x 780 x 176 mm	1610 x 780 x 176 mm
Total weight	86,6 kg	120 kg	153,5 kg	187 kg
Compatible inverters	Fronius hybrid inverter²
Protection class	IP65
Max. altitude above sea level	2000 m
Ambient temperature range³	-20 to +55°C
Permissible humidity	5-95 %
Installation	Indoor and protected outdoor areas
DC connection technology	4x Amphenol
Certificates and compliance with standards	IEC62619:2022; CE; VDE 2510-50; IEC62477-1; UN38.3
Interfaces	Modbus (RS485)
Warranty	10 years

¹The charging and discharging current is limited by the inverter.

²Except Fronius Symo Hybrid.

³Depending on the temperature, the charging/discharging capacity can be limited.

Find an installer

Do you want to order and have the Fronius Reserva installed in your home? Then get in touch with one of our Fronius partner installers in your area.

Find a sales partner

As an installer, you can use our sales partner search to find the right Fronius partner in your area. Simply get in touch and order the Fronius Reserva for your customers.

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