Control module – FRONIUS – Reserva BMS
Product details
Reserve
Reserva by Fronius is a high-voltage, DC-coupled battery for storing solar energy with minimal losses. It uses lithium iron phosphate (LFP) cells and works with Fronius hybrid inverters, except for the Fronius Symo Hybrid. Its modular design allows the storage capacity to be tailored to the user’s needs.
Key advantages of Reserva
- Usable capacity 6.31–15.79 kWh depending on the configuration, comprising 2 to 5 modules.
- Expansion up to approximately 63 kWh thanks to the parallel connection of up to four towers, without additional combiner boxes.
- 10-year warranty with a guarantee of retaining at least 80% of the battery capacity for 10 years.
- Backup power and black start capability — the battery can also charge and discharge during a power outage.
- Support for variable energy tariffs thanks to the energy cost assistant in Solar.web Premium: charging when prices are low and using stored energy when tariffs are higher.
- Enclosure with a depth of 176 mm and an IP65 protection rating allows installation indoors and in a sheltered outdoor area, including in confined spaces, e.g. in a garage.
Who is this a good choice for?
Reserva is a solution for homeowners with a photovoltaic system and a compatible Fronius hybrid inverter who want to store solar energy and benefit from backup power. Users on variable electricity tariffs can use the energy cost assistant feature in Solar.web Premium, while those planning to increase storage capacity can take advantage of the modular design and the option to connect towers in parallel.
| Parameter | Reserve 6.3 | Reserve 9.5 | Reserve 12.6 | Reserve 15.8 |
|---|---|---|---|---|
| Electrical parameters | ||||
| Usable capacity (kWh) | 3,15 | |||
| Number of battery modules | 2 | 3 | 4 | 5 |
| Nominal voltage (V) | 102,4 | |||
| Voltage range (V) | 185,6 ~ 227,2 | 278,4 ~ 340,8 | 371,2 ~ 454,4 | 464 ~ 568 |
| Maximum output current (A) | 32 | |||
| General information | ||||
| Battery cell type | Lithium iron phosphate (LFP) | |||
| Parallel operation | Up to 4 batteries | |||
| Compatible inverters | Fronius hybrid inverter ² | |||
| DC connection technology | 4x Amphenol | |||
| Interfaces | RS485 | |||
| Dimensions and weight | ||||
| Dimensions (H x W x D) (mm) | 250 x 780 x 176 | |||
| Weight (kg) | 33,5 | |||
| Operating conditions | ||||
| Degree of protection | IP65 | |||
| Maximum altitude above sea level (m) | 2000 | |||
| Ambient temperature (°C) | -20 to +55 | |||
| Permissible humidity (%) | 5 - 95 | |||
| Installation location | Indoor area and protected outdoor area | |||
| Certificates | ||||
| Certifications and standards met | IEC62619:2022; CE; VDE 2510-50; IEC62477-1; UN38.3 | |||
| Warranty | ||||
| Product warranty (years) | 10 | |||
| Components — BMS | ||||
| Dimensions (H x W x D) (mm) | 250 x 780 x 176 | |||
| Weight (kg) | 33,5 | |||
| Components — basics | ||||
| Dimensions (H x W x D) (mm) | 250 x 780 x 176 | |||
| Weight (kg) | 33,5 | |||
| Components — single module | ||||
| Usable capacity (kWh) | 3,15 | |||
| Nominal voltage (V) | 102,4 | |||
| Dimensions (H x W x D) (mm) | 250 x 780 x 176 | |||
| Weight (kg) | 33,5 | |||
The charging and discharging current is limited by the inverter. Compatibility does not include Fronius Symo Hybrid. Charging and discharging power may be limited depending on the temperature.

