Fronius Reserva 9.5
A high-voltage lithium iron phosphate battery tower with three modules and 9.47 kWh usable energy, IP65, for Fronius GEN24 Plus and Verto Plus inverters.
- Best for GEN24 inverter systems
- Installed battery
- 9.47 kWh
- 10-year warranty
- Made by Fronius.
- Energy: 9.47 kWh usable from three 3.15 kWh modules (the Reserva range runs from 6.31 kWh with two modules to 15.79 kWh with five).
- A battery only: it works with Fronius Primo GEN24 Plus, Symo GEN24 Plus and Verto Plus inverters.
- Maximum charge and discharge power 9.83 kW, limited to 32 A and depending on temperature, charge level and the inverter.
- Warranty 10 years; service life 6,000 cycles until 60% state of health. IP65.
Not tested by us
We have not tested the Fronius Reserva 9.5. The figures on this page come from the sources listed at the end of the page, checked on 11 November 2026, and we do not show prices. "Best for" is based on what the maker says the product is designed for, not on our own tests.
Key figures
9.47 kWh
Usable energy
9.83 kW
Maximum charge/discharge power
10 years
Warranty
Specifications
Last checked on 11 November 2026. The grey text under each name explains what the value means.
| Specification | Value |
|---|---|
| Storage | |
| CapacityHow much energy the battery stores. Bigger means longer runtime or more of your own solar power used later. | 9.47 kWh usable with three battery modules (3.15 kWh each), measured at 0.2C and 25 °C |
| Battery chemistryLFP (lithium iron phosphate) cells are known for long life and stable behaviour with heat. | Lithium iron phosphate (LFP), pouch cells |
| Depth of dischargeHow much of the battery can be emptied without harming it. 90% means 10% is kept in reserve. | Not stated as a percentage: the datasheet gives usable energy |
| Cycle lifeHow many full charge and discharge cycles the cells are rated for before they hold less than the stated share of their original capacity. | 6,000 cycles until 60% state of health (at 0.5C charge and discharge rate) |
| ExpansionExtra battery units that add storage to the same system. | Two to five modules per tower, and up to 4 towers in parallel with the same number of modules per tower |
| Power | |
| Charge and discharge powerHow fast the battery can take in and give out energy. It sets how many devices it can serve at once. | Maximum 9.83 kW (may vary with temperature, state of charge and the connected inverter); maximum output current 32 A, also with several towers in parallel. Rated voltage 307.2 V, range 278.4 to 340.8 V. |
| Round-trip efficiencyThe share of the energy you put in that comes back out. The rest is lost as heat. | Battery efficiency 95% at 0.2C and 25 °C (Fronius gives it as battery efficiency, not round-trip) |
| Backup in a power cutWhether it can keep selected circuits running during a grid outage. | Not stated in the battery datasheet: backup depends on the Fronius inverter system |
| Solar | |
| Solar inverterTurns the DC power from solar panels into AC for the home. Built in means no separate solar inverter is needed. | None: this is the battery only. Compatible inverters: Fronius Primo GEN24 Plus, Symo GEN24 Plus and Verto Plus |
| Connection and housing | |
| Grid connectionThe supply type it is built for. Check it matches your home's supply. | Not applicable: the battery connects to a Fronius inverter (high-voltage DC, Stäubli MC4-Evo connectors, 6 mm²) |
| Dimensions (W × D × H)Check the space before you buy, including room around it for airflow and cables. | 772 × 176 × 1,140 mm |
| WeightMatters for lifting, wall mounting and moving it. | 120 kg (base unit 16 kg, base 3.5 kg and 33.5 kg per module) |
| Protection ratingIP ratings show protection from dust and water. IP55 and IP65 are rated for outdoor-style exposure; check the installation guidance. | IP65; indoor and protected outdoor areas; humidity 5 to 95%; altitude up to 2,000 m |
| Operating temperatureThe range it is rated to work in. Cold and heat can reduce performance. | -20 to 55 °C ambient; charge and discharge power can be limited by temperature |
| Battery heatingA built-in heater that lets the battery charge in cold weather. | Not stated in the datasheet |
| ConnectivityHow you monitor and control it, usually through an app. | RS485 |
| CertificationsSafety and grid standards the maker says the product meets. | IEC 62619:2022 (including thermal runaway test), CE, VDE 2510-50, IEC 62477-1, UN 38.3 |
| Warranty | |
| WarrantyThe period the maker covers. Read the terms: conditions and capacity guarantees differ. | 10 years |
Compatible with
What Fronius says this product works with. Anything not listed here is not confirmed.
- Inverters
- Fronius Primo GEN24 Plus, Symo GEN24 Plus and Verto Plus.
- Expansion
- Up to 4 towers in parallel, with an identical number of modules per tower.
- Installation
- Indoors and in protected outdoor areas.
Rules where you live
An installed battery normally needs a qualified electrician, and in many countries you must also tell your grid operator, especially if it can export. This is not a plug-in battery. Rules, incentives and tax treatment differ by country: see our country guides for what applies where you live.
Strengths and things to check
Strengths
- 10-year warranty and 6,000 cycles to 60% health
- IP65 and indoor or protected outdoor installation
- Modular from 6.31 to 15.79 kWh per tower
- Battery efficiency of 95% stated
Worth checking before you buy
- Works only with Fronius GEN24 Plus and Verto Plus inverters
- Output current is limited to 32 A, even with several towers
- Backup and heating are not described in the battery datasheet
- 120 kg tower that needs a suitable wall and space
Change log
We record changes to this page here, so you can see when figures such as the warranty were last updated.
- 11 November 2026
- Page published. Warranty at publication: 10 years. Figures are from Fronius's Reserva datasheet (EN, version V08, November 2025) for the Reserva 9.5 with three modules; the 6.3, 12.6 and 15.8 variants are not covered here. A newer Reserva Pro exists and is not covered.
Where this information comes from
We have not tested this battery. Every figure above comes from Fronius's Reserva datasheet (English, version V08 of November 2025), last checked on 11 November 2026. The values are for the Reserva 9.5 with three modules. A value that the datasheet does not state is shown as not stated.
We do not show prices, because they depend on the installer's quote.
- Manufacturer Fronius Reserva datasheet (EN, V08 November 2025)
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Common questions about Fronius Reserva 9.5
How much does the Fronius Reserva 9.5 store?
Fronius lists 9.47 kWh usable energy for the three-module Reserva 9.5, measured at 0.2C and 25 °C.
Which inverters work with the Reserva?
Fronius names the Primo GEN24 Plus, Symo GEN24 Plus and Verto Plus. The battery is not a stand-alone product.
What warranty does the Reserva have?
Fronius lists a 10-year warranty and a service life of 6,000 cycles until the battery reaches 60% state of health.
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