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Fronius LFP: 15.8kWh [HV Battery]
The Fronius Reserva is a DC-coupled high-voltage modular Lithium Iron Phosphate (LFP) battery system designed for residential solar energy storage. Built around 3.15 kWh modules operating at a nominal 102.4 V each, the Reserva 15.8 uses 5 stacked modules to deliver 15.78 kWh of 100% usable energy. With 11.34 kW continuous charge/discharge power, a 12.68 kW 5-second peak, a 10-year warranty with 70% capacity retention in Australia, backup power capability, and full Fronius Solar.web monitoring, the Reserva 15.8 is the highest-capacity single-tower solution in the Reserva range. Designed to pair with Fronius GEN24 Plus and Verto Plus hybrid inverters, it delivers a fully integrated ecosystem for inverter, battery, monitoring, and support.
Fronius LFP 3.15 DataSheet
Fronius LFP 3.15 User Manual
Fronius LFP 3.15 Warranty
Key Benefits
| Benefit | What It Means for You |
|---|---|
| 10-Year Warranty (70% Capacity) | In Australia (Country Group 3), the minimum end-of-warranty capacity is 70% SOH - or higher total energy throughput, whichever occurs first. |
| 100% Usable Energy (DOD) | The full 15.78 kWh of stored energy is available to power your home. |
| 11.34kW Continuous Power | Steady continuous output handles typical residential loads including air conditioning, pool pumps and EV charging without throttling. |
| 12.68 kW Peak Power (5s at 25°C) | Short-duration peak output handles starting currents for motors and compressors. Rated at 37.76 A peak current for 5 seconds at 25°C. |
| 3.15 kWh Modules | Larger modules mean fewer components, faster installation, and a more compact footprint for the same capacity. |
| IP65 Rated Enclosure | Complete dust protection and water jet resistance, suitable for indoor or outdoor installation across all Australian climate zones, including exposed or coastal locations. |
| Fronius Solar.web Integration | Full system monitoring via the free Fronius Solar.web platform — live energy yield, consumption, battery state, and alerts. Covers all Fronius devices (inverter, battery, Wattpilot EV charger) without additional third-party tools. |
Premium Performance for High-Demand Homes
The Fronius Reserva 15.8 connects directly to the DC side of a compatible Fronius hybrid inverter, maximising efficiency by reducing conversion losses. As the largest single tower in the Reserva lineup, the 15.8 kWh system delivers extended runtime and higher sustained output, making it ideal for homes with significant overnight consumption, electrified appliances, and EV charging requirements. With 11.34 kW continuous output and 12.68 kW peak power, the system is capable of supporting near whole-home backup scenarios when paired with an appropriately configured Fronius inverter.
Advanced LFP Architecture at Scale
The Reserva platform uses lithium iron phosphate chemistry for improved safety, longevity, and thermal stability. Each module operates at 102.4 V nominal and 30.85 Ah. In the 15.8 kWh configuration, 5 modules are stacked to deliver 15.78 kWh usable energy at a nominal voltage of 512.0 V. The system operates within a voltage range of approximately 464.0 V to 568.0 V. The integrated battery management system monitors cell voltage, temperature, current, and system conditions to ensure safe and reliable operation.
Designed for Expansion and Long-Term Value
The Reserva 15.8 represents the maximum capacity per single tower in the Fronius system. For larger storage requirements, up to four towers can be connected in parallel, delivering up to 63.2 kWh total storage. As with all Reserva systems, increasing capacity through additional towers does not increase peak power output — it increases storage duration. This makes the 15.8 an ideal foundation for high-consumption households or future energy independence strategies.
Technical Specifications
Energy Storage Specifications
| Parameter | Value |
|---|---|
| Model Number | Fronius Reserva 15.8 |
| Chemistry Type | LiFePO4 Prismatic Cell |
| Total Usable Capacity | 15.78 kWh (100% DOD) |
| Battery Module Capacity | 3.15 kWh per module |
| Number of Modules | 5 |
| Depth of Discharge (DOD) | 100% (settable) |
| Nominal System Voltage | 512.0 V |
| System Voltage Operating Range |
464.0 V – 568.0 V |
| Module Weight | 35.5 kg |
Power Specifications
| Parameter | Value |
|---|---|
| Max. Continuous Charge/Discharge Current | 22.1 A |
| Continuous System Power (approx.) | 11.34 kW |
| Short Circuit Protection | Integrated BMS overcurrent protection |
Physical & Environmental Specifications
| Parameter | Value |
|---|---|
| Dimensions (W × H × D) | 1140 × 1138 × 176 mm |
| Weight | 191 kg |
| Installation Location | Indoor/Outdoor |
| Mounting Method | Wall Mounted / Floor Stand |
| Protection Rating | IP65 |
| Cooling Method | Natural Convection |
| Operating Temperature Range (Optimum) | 15 °C to 30 °C |
| Permitted Temperature Range (Ambient) | -20 °C to 55 °C |
| Max. Operating Altitude | ≤ 2000 m |
| Allowable Relative Humidity | 5% - 95% |
System Integration
| Parameter | Value |
|---|---|
| Installation Type | DC Coupled (High Voltage) |
| Communication Interface | RS485 (Modbus) |
| Scalability | 2–5 Modules per Tower. Max 4 systems in parallel (63.2 kWh total) |
| Monitoring | Fronius Solar.web App & Web Platform, LED Status Display |
Warranty & Performance
| Metric | What It Means |
|---|---|
| Warranty Period | 10 Years |
| Minimum Capacity at End of Warranty | 70% of nominal capacity |
| Throughput Warranty | Scales proportionally with system size |
| Round-Trip Efficiency | 6000 cycles to ≥60% SoH |
| Battery Protection | Over/under voltage, over-current, over/under temperature, BMS with automatic deep-discharge protection |
Compatibility Table
The Sungrow SBH High Voltage Battery is primarily designed for Sungrow three-phase hybrid inverters:
| Component | Compatible Models/Types |
|---|---|
| Hybrid Inverters (Three-Phase — Primary) |
Symo GEN24 5.0–12.0 Plus Verto Plus 15.0–33.3 |
| Hybrid Inverters (Single-Phase) | Primo GEN24 3.0–10.0 Plus |
| Note on 9.5 LFP (9.5 kWh) | This capacity model is compatible with the listed Fronius hybrid inverter range subject to current Fronius compatibility guidance and approved system design. |
| Parallel Systems | Supports up to 4 battery systems connected in parallel (total: up to 63.2 kWh). |
Installation & Requirements
What's Included
| Included (✓) | Not Included (Required) |
|---|---|
| ✓ 5 × 3.15 kWh Reserva Battery Modules | Fronius GEN24 Plus or Verto Plus Hybrid Inverter |
| ✓ Reserva Battery Management System (BMS) | DC/AC Isolators (required for system safety) |
| ✓ Communication Cables & Connectors | Main Power Cabling (sized for your installation) |
| ✓ Mounting Hardware & Documentation | Installation Labour & Electrical Approvals |
Installation Prerequisites
| Requirement | Details |
|---|---|
| Location | Indoor or Outdoor (IP65 rated). Must be free of flammable/explosive materials and inaccessible to children. |
| Temperature Range | Permitted operation: -20°C to +55°C. Optimal: 15°C–30°C. |
| Mounting | Wall-mounted, vertical stacking installation using supplied bracket. The BMS unit mounts to the wall; battery modules stack below. Minimum 300 mm clearance required on top and bottom. |
| Handling | Each module weighs approximately 35.5 kg. Two-person handling is required for all module installation and removal. Total system weight for the Reserva 12.6 is 155 kg. |
| Clearances | Minimum 300 mm on top and bottom. In Australia, minimum 600 mm from all non-PV-system objects. |
Certifications & Compliance
| Certification | What It Means | Applies To |
|---|---|---|
| CEC Approved | Clean Energy Council listed for eligibility in Australian rebate schemes. | Product |
| IEC 62619 | Safety requirements for secondary lithium cells and batteries for use in industrial applications. | Battery |
| IEC 62040 | Uninterruptible power systems (UPS) standard. | System |
| UN38.3 | United Nations certification for the safe transport of lithium metal and lithium ion batteries. | Transport |
| VDE 2510-50 | German standard for stationary energy storage systems (inferred safety/performance). | System |
| UL9540A | Module-level and system-level fire safety certification. | System |
| IP65 | Complete protection against dust ingress and protection against water jets from any direction. | Enclosure |
AS/NZS 5139 Compliance Positioning
| Compliance Area | Positioning |
|---|---|
| Battery Chemistry | Uses Lithium Iron Phosphate (LFP) chemistry, widely regarded as a safer and more thermally stable battery technology for residential energy storage applications. |
| Installation Environment | Suitable for indoor or outdoor installation subject to site-specific assessment, required clearances, and installer compliance with AS/NZS 5139 and all local electrical and building requirements. |
| System Protection | Includes battery protection functions such as over/under voltage, over current, and over/under temperature monitoring, supporting safe system design when installed correctly. |
| Mounting Requirements | Floor-mounted configuration with wall fixing of the top module supports secure installation, but final compliance depends on the certified installer's site design and mounting method. |
| Location Assessment | Final placement must be assessed against AS/NZS 5139 requirements for exclusion zones, egress paths, habitable rooms, windows, doors, vents, and nearby ignition sources. |
| Installer Responsibility | Compliance with AS/NZS 5139 is determined by the complete installed system, not the battery alone. Installation must be completed by a suitably licensed and accredited installer. |
| Australian Market Suitability | CEC listing and relevant product certifications support suitability for Australian residential installations, subject to compliant system design and installation practices. |
Important: Product features and certifications support compliant installation outcomes, however final AS/NZS 5139 compliance is site-specific and must be confirmed by the installer based on battery location, mounting surface, clearances, barriers, ventilation, and the overall system design.
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