Fronius Reserva Pro 28.0 27.86 Usable Capacity 28 kWh (7 modules à 3.98 kWh + 1 Reserva Pro BMS + base)
€ 9.970,50 exkl. USt.
Fronius Reserva Pro 28.0 27.86 Usable Capacity 28 kWh (7 modules à 3.98 kWh + 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
Pro 24.023.9 kWh6 Modules
Pro 28.027.9 kWh7 Modules Current
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 7 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 commonly used in residential homes.
IP65 – also outdoors
Indoor and sheltered outdoor area, −20 to +50 °C, up to 2,000 m above sea level. No separate technical room required.
High-voltage technology
495.88 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 funding.
Warranty & Longevity
Funding in Austria
The prerequisite is that the product is listed on the White List of the EAG processing agency 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 may change at any time – without guarantee and without claim to a funding commitment. Binding information is provided exclusively by the EAG processing agency.
Technical Data – Reserva Pro 28.0
| Parameter | Value |
|---|---|
| Usable Energy | 27.9 kWh |
| Number of Battery Modules | 7 × 3.98 kWh |
| Nominal Voltage | 495.88 V |
| Voltage Range | 385 – 562.1 V |
| Maximum Output Current | 50 A |
| Battery Cell Chemistry | Lithium Iron Phosphate (LFP) |
| Dimensions (H × W × D) | 1,415 × 579 × 449 mm |
| Weight | 270 kg |
System & Operating Conditions
| Parameter | Value |
|---|---|
| Parallel Operation | up to 4 batteries (max. 127.6 kWh) |
| Protection Class | IP65 / II |
| Ambient Temperature | −20 to +50 °C |
| Permissible Humidity | 5 – 95 % |
| Maximum Altitude above Sea Level | 2,000 m |
| Installation Location | Indoor and sheltered outdoor area |
| DC Connection Technology | Stäubli MC4 Evo Stor |
| Interfaces | Modbus (RS485) |
| Compatible Inverters | Fronius GEN24 Plus and Verto Plus |
Certificates & Standard Compliance
Frequently Asked Questions
What does LFP mean and why this cell chemistry?
LFP stands for Lithium Iron Phosphate. These cells are cobalt-free, significantly more thermally stable than NMC cells, and can withstand many charging cycles. For a storage unit that is charged and discharged daily for years and is located in a residential building, this is the safest common design.
How much do 27.9 kWh bring me in everyday life?
27.9 kWh is designed for an annual consumption of 9,000 to 12,000 kWh – a large house with a heat pump and multiple electric cars, or a commercial enterprise. It can also easily bridge several cloudy days in a row.
Is there funding for the storage unit?
The EAG investment grant supports electricity storage units 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 subsidized, only in conjunction with a new or expanded PV system. All information is non-binding – binding information is provided by the EAG processing agency.
Can I expand the storage unit later?
Yes. A tower can accommodate up to 8 modules of 3.98 kWh each, totaling up to 31.9 kWh. In addition, up to 4 towers can be operated in parallel, totaling up to 127.6 kWh. So you start small and grow as heat pumps or electric cars are added.
Can the storage unit be placed outdoors?
The Reserva Pro is IP65 protected and approved for indoor and sheltered outdoor use, at −20 to +50 °C and up to 2,000 m above sea level. Sheltered means: no prolonged direct rain and no blazing sun, for example under a canopy 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 the 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 upon request. For orders over €5,000, shipping within Austria is free. We are happy to advise you personally on design questions.
€ 9.970,50 exkl. USt.
Fronius Reserva Pro 28.0 27.86 Usable Capacity 28 kWh (7 modules à 3.98 kWh + 1 Reserva Pro BMS + base) is backordered and will ship as soon as it is back in stock.