Fronius Reserva Pro is a high-voltage battery storage system developed for large residential buildings, commercial businesses, agricultural operations and photovoltaic systems with high energy consumption.
Its modular design allows each tower to be configured with a minimum of three and a maximum of eight modules, providing a usable capacity ranging from 11.9 to 31.9 kWh. Up to four towers of the same capacity can be connected in parallel, reaching a maximum total storage capacity of 127.6 kWh, commercially indicated as 128 kWh.
Lithium iron phosphate (LFP) cells provide high thermal and chemical stability. The multi-level safety design and integrated Battery Management System continuously monitor overvoltage, undervoltage, overcurrent, temperature and potential cell or hardware faults.
Reserva Pro is compatible with Fronius Primo GEN24 Plus, Symo GEN24 Plus and Verto Plus hybrid inverters. When combined with Fronius Verto Plus, DC coupling enables a maximum charging and discharging power of 28.3 kW. The effective charging and discharging current is limited according to the inverter used.
When integrated with a compatible Fronius inverter and a correctly configured backup power changeover system, the battery can supply priority loads during grid outages. Its Black Start capability also supports system restart without a grid power supply by using the residual energy available in the battery.
Through Fronius Solar.web and the Fronius Energy Cost Assistant, the system can optimise energy management by analysing photovoltaic production, electricity consumption and energy prices. AI-based algorithms adapt the storage strategy to increase self-consumption and reduce energy costs, without requiring additional hardware.
The IP65 protection rating allows installation indoors and in sheltered outdoor areas. The permitted ambient temperature range is from –20°C to +50°C, although charging and discharging power may be limited depending on the temperature.
Communication with the inverter takes place via the Modbus RS485 protocol, while the DC-side connection uses Stäubli MC4-Evo stor connectors. Commissioning can be completed through the Fronius Solar.start app or via the inverter’s web interface.
Both the battery cells and modules are manufactured in Europe, helping to reduce transport distances and improve supply chain stability.
Fronius Reserva Pro is covered by a 10-year warranty, with the battery retaining 80% of its state of health. Any capacity expansion is recommended within the first two years following initial commissioning. Expansion remains possible at a later date, but new modules will operate according to the lowest SOH level within the battery system.
