Fronius Reserva Pro 20.0 19.9 Usable Capacity 20 kWh (5 modules of 3.98 kWh each + 1 Reserva Pro BMS + base)
€ 7.475,58 exkl. USt.
Fronius Reserva Pro 20.0 19.9 Usable Capacity 20 kWh (5 modules of 3.98 kWh each + 1 Reserva Pro BMS + base) is backordered and will ship as soon as it is back in stock.
All expansion stages at a glance
Pro 12.011.9 kWh3 Modules
Pro 16.015.9 kWh4 Modules
Pro 20.019.9 kWh5 Modules Current
Pro 24.023.9 kWh6 Modules
Pro 28.027.9 kWh7 Modules
Pro 32.031.9 kWh8 Modules
Prices incl. VAT, daily updated from the shop. All stages consist of the same modules – subsequent upgrading is possible at any time.
Advantages at a glance
Modularly expandable
Built from 5 modules, expandable in the tower up to 8 modules (31.9 kWh). Up to 4 towers in parallel result in 127.6 kWh.
LFP cell chemistry
Lithium iron phosphate is thermally stable and cobalt-free – the safest cell chemistry widely used in homes.
IP65 – also outdoors
Indoor and protected outdoor areas, -20 to +50 °C, up to 2,000 m above sea level. No separate technical room required.
High-voltage technology
354.2 V nominal voltage and 50 A maximum output current – fewer conversion losses than with low-voltage systems.
10 year warranty
Fronius guarantees 80% of the originally usable capacity (State of Health) after 10 years.
Made in Europe
Fronius develops and produces in Upper Austria – relevant for the Made-in-Europe bonus of the EAG subsidy.
Warranty & Longevity
Funding in Austria
A prerequisite is that the product is listed on the EAG processing body's whitelist and that the bonus is applied for together with the main application. Storage units are also only subsidized in conjunction with a newly built or expanded PV system. Non-binding information, as of August 2026. Subsidy rates, conditions and product listings are subject to change at any time – without guarantee and without claim to a funding commitment. Binding information is provided exclusively by the EAG processing body.
Technical Data – Reserva Pro 20.0
| Parameter | Value |
|---|---|
| Usable energy | 19.9 kWh |
| Number of battery modules | 5 × 3.98 kWh |
| Nominal voltage | 354.2 V |
| Voltage range | 275 – 401.5 V |
| Maximum output current | 50 A |
| Battery cell chemistry | Lithium Iron Phosphate (LFP) |
| Dimensions (H × W × D) | 1,095 × 579 × 449 mm |
| Weight | 198 kg |
System & Operating Conditions
| Parameter | Value |
|---|---|
| Parallel operation | up to 4 batteries (max. 127.6 kWh) |
| Protection class / Safety class | IP65 / II |
| Ambient temperature | −20 to +50 °C |
| Permissible humidity | 5 – 95 % |
| Maximum altitude above sea level | 2,000 m |
| Mounting location | Indoor and protected outdoor area |
| DC connection technology | Stäubli MC4 Evo Stor |
| Interfaces | Modbus (RS485) |
| Compatible inverters | Fronius GEN24 Plus and Verto Plus |
Certificates & Standards Compliance
Frequently asked questions
What does LFP mean and why this cell chemistry?
LFP stands for Lithium Iron Phosphate. These cells do not contain cobalt, are significantly more thermally stable than NMC cells and tolerate many charging cycles. For a storage unit that is charged and discharged daily for years and located in a residential building, this is the safest common design.
How much do 19.9 kWh bring me in everyday life?
19.9 kWh is the right size for households with an annual consumption of 6,000 to 8,000 kWh – i.e. a detached house with a heat pump or an electric car. The storage unit lasts through the night and still has a reserve for one charge in the morning.
Is there funding for the storage unit?
The EAG investment subsidy will fund electricity storage in 2026 with €150 per kWh of usable capacity, with a Made-in-Europe bonus of €165 per kWh. Up to 50 kWh and a maximum of 30% of the investment costs are funded, only in conjunction with a new or expanded PV system. All information is non-binding – binding information is provided by the EAG processing body.
Can I expand the storage unit later?
Yes. A tower can hold up to 8 modules of 3.98 kWh each, i.e. up to 31.9 kWh. In addition, up to 4 towers can be operated in parallel, for a total of up to 127.6 kWh. So you start small and grow as a heat pump or electric car is added.
Can the storage unit be placed outdoors?
The Reserva Pro is IP65 protected and approved for indoor and protected outdoor areas, at -20 to +50 °C and up to 2,000 m above sea level. Protected means: no continuous direct rain and no blazing sun, for example under an awning or in a carport.
Who is Fronius?
Fronius International is an Austrian family business based in Wels, Upper Austria, founded in 1945. In addition to welding technology and battery charging systems, solar electronics is one of its three divisions. Development and production take place in Austria.
Where can I buy the Fronius Reserva Pro in Austria?
At SOLARVIC on solarvic.at – as a specialist dealer and installer, we deliver throughout Austria and install on request. For orders over €5,000, shipping within Austria is free. For questions regarding dimensioning, we would be happy to advise you personally.
€ 7.475,58 exkl. USt.
Fronius Reserva Pro 20.0 19.9 Usable Capacity 20 kWh (5 modules of 3.98 kWh each + 1 Reserva Pro BMS + base) is backordered and will ship as soon as it is back in stock.