Fronius' new battery storage system features backup power and high charge rates

Following its initial announcement in February 2026, the new Reserva Pro battery is now becoming available at a growing number of retailers. Much like the standard Fronius Reserva model (without the "Pro"), the manufacturer is thus joining the ever-growing list of high-voltage storage providers. Direct competitors are likely to be Varta or BYD, who have also recently introduced new models.

According to Fronius, the energy storage system is geared particularly toward customers with high energy needs, such as large residential buildings or commercial enterprises. The system is indeed highly scalable: in its maximum configuration (via parallel connection), up to 128 kWh of storage capacity is possible. Thanks to the modular design, smaller systems can also be realized, with 3 modules totaling around 12 kWh representing the minimum system size. However, this capacity puts it in a range that should also be attractive to average customers with standard homes.

A major advantage of this new battery generation is its high charging and discharging performance, which ranges from roughly 10.6 to 28.3 kW, depending on the number of modules used. On the one hand, this is highly beneficial for backup power operations when the entire household, including large loads, needs to be supplied during a power outage. On the other hand, the manufacturer claims this will also help increase the self-consumption rate of power-hungry appliances.

Speaking of backup power and charging performance: Although the manufacturer naturally promotes these features in conjunction with the new battery, it should be noted here that all other system components must be equipped accordingly to utilize them. For instance, high charge rates require a suitably powerful inverter. Furthermore, anyone wanting to benefit from a whole-home backup power supply will need, at the very least, an appropriate transfer switch. In this context, Fronius mentions its own Backup Controller.

Pricing and Alternative Options

For the smallest 12 kWh configuration, the current estimated price in Europe is around 6,000 euros (see Geizhals price comparison). As more storage modules are added, prices increase accordingly; a 32 kWh setup is priced at around 13,000 euros. Deliveries are expected to begin around mid-April.

Those looking to save money and who do not necessarily need to scale their system to over 100 kWh of storage capacity will certainly find a more cost-effective option with the standard Fronius Reserva or BYD models. These offer very similar performances and are currently retailing at around 4,000 to 5,000 euros for approximately 11 to 12 kWh of capacity.