
Fronius Reserva Pro 4,240,390 High Voltage Storage Battery 3.98kWh LiFePO4
The code 4,240,390 identifies the 3.98kWh Fronius Reserva Pro storage module, the building block of the Fronius Reserva Pro high voltage battery intended for medium to large residential and small commercial applications. Each tower accepts from 3 to 8 modules, covering sizes from 12.0 to 32.0kWh (11.9 - 31.9kWh usable); by connecting up to 4 systems in parallel, about 128kWh can be reached.
The module uses LiFePO4 cells, has a nominal voltage of 70.84V (range 55 - 80.3V) and weighs 36 kg. The battery interfaces via Modbus RS485 with the Fronius Primo GEN24 Plus, Symo GEN24 Plus and Verto Plus hybrid inverters, delivers up to 50A and uses Stäubli MC4 Evo Stor DC connectors. It is IP65 certified, operates from -20 to +50 °C and is covered by a 10-year warranty at 80% SOH.
Key features
Technical specifications
| Feature | Value |
|---|---|
| Product code | 4.240.390 |
| Model | Fronius Reserva Pro - 3.98kWh battery module (code 4,240,390) |
| Chemistry | LiFePO4 (LFP) |
| Nominal energy | Not declared separately by Fronius |
| Usable energy | 3.98kWh per module (11.9kWh with 3 modules, 31.9kWh with 8) |
| Rated voltage | 70.84V per module (212.52V with 3 modules, 566.72V with 8) |
| Voltage range | 55 - 80.3V per module (165 - 240.9V with 3 modules; 440 - 642.4V with 8) |
| Capacity | Not declared by Fronius |
| Max charge current | 50A (limited by the inverter) |
| Max discharge current | 50A (limited by the inverter) |
| Charge/discharge power | Determined by the paired Fronius hybrid inverter |
| Depth of discharge (DoD) | Not declared (Fronius states only the usable energy) |
| Modules per tower / scalability | From 3 to 8 modules per tower; up to 4 systems in parallel (approx. 128kWh) |
| Compatible inverters | Fronius Primo GEN24 Plus, Symo GEN24 Plus and Verto Plus |
| Communication | Modbus (RS485) |
| DC connection | Stäubli MC4 Evo Stor |
| Protection rating | IP65 - safety class II |
| Operating temperature | -20 ~ +50 °C |
| Humidity / Altitude | 5 - 95%; up to 2,000 m above sea level |
| Dimensions | System from 775 x 579 x 449 mm (3 modules) to 1,575 x 579 x 449 mm (8 modules) |
| Weight | 36 kg per module |
| Cycle life | Not declared in the datasheet |
| Warranty | 10 years (80% SOH) |
Documentation
PDFDatasheet 4,240,390Official manufacturer documentPlease check compatibility with your inverter and with the other modules in the tower before ordering. Installation must be carried out by qualified personnel in accordance with the applicable standards.