Batteries

Fronius Reserva

£ 1,099.82GBP · price may vary

Model: FR-4.240.370
Specifications: 21

Primo GEN24 3.0 Plus3.0 kW
Primo GEN24 3.6 Plus3.6 kW
Primo GEN24 4.0 Plus4.0 kW
Primo GEN24 4.6 Plus4.5 kW
Primo GEN24 5.0 Plus4.5 kW
View all 21 specifications ↓

Overview

The Fronius Reserva is an efficient DC-coupled high-voltage battery for storing solar energy with minimal losses. It can be flexibly expanded with two to five modules and is perfectly matched to Fronius hybrid inverters - for maximum performance. European data security and fast service ensure maximum reliability. 6.3-15.8kWh per tower Up to 4 parallel towers for a maximum capacity of 63.2kWh IP 65 Warranty: 10 years, 80% usable capacity Nominal DC-charge/discharge power (kW) with Fronius hybrid inverters 1 Reserva 6.3 (2 modules) Reserva 9.5 (3 modules) Reserva 12.6 (4 modules) Reserva 15.8 (5 modules) Primo GEN24 3.0 Plus 3.0 kW 3.0 kW - - Primo GEN24 3.6 Plus 3.6 kW 3.6 kW - - Primo GEN24 4.0 Plus 4.0 kW 4.0 kW - - Primo GEN24 4.6 Plus 4.5 kW 4.6 kW - - Primo GEN24 5.0 Plus 4.5 kW 5.0 kW - - Primo GEN24 6.0 Plus 4.5 kW 6.0 kW - - Primo GEN24 8.0 Plus 4.5 kW 6.75 kW - - Primo GEN24 10.0 Plus 4.5 kW 6.75 kW - - Symo GEN24 3.0 Plus 2.56 kW 3.0 kW 3.0 kW 3.0 kW Symo GEN24 4.0 Plus 2.56 kW 3.84 kW 4.0 kW 4.0 kW Symo GEN24 5.0 Plus 2.56 kW 3.84 kW 5.0 kW 5.0 kW Symo GEN24 6.0 Plus 4.5 kW 6.0 kW 6.0 kW 6.0 kW Symo GEN24 8.0 Plus 4.5 kW 6.75 kW 8.0 kW 8.0 kW Symo GEN24 10.0 Plus 4.5 kW 6.75 kW 9.01 kW 10.0 kW Symo GEN24 12.0 Plus SC 4.5 kW 6.75 kW 9.01 kW 11.26 kW Verto Plus 15.0 6.55 kW 9.83 kW 13.1 kW 15.0 kW Verto Plus 17.5 6.55 kW 9.83 kW 13.1 kW 15.0 kW Verto Plus 20.0 6.55 kW 9.83 kW 13.1 kW 15.0 kW Verto Plus 25.0 6.55 kW 9.83 kW 13.1 kW 15.0 kW Verto Plus 30.0 6.55 kW 9.83 kW 13.1 kW 15.0 kW Verto Plus 33.3 6.55 kW 9.83 kW 13.1 kW 15.0 kW 1 This data refers to the DC charge and discharge power. The DC discharge power varies from the AC power that reaches the loads in the home, since the efficiency rate of the inverter must also be included here.

Specifications

Primo GEN24 3.0 Plus	3.0 kW
Primo GEN24 3.6 Plus	3.6 kW
Primo GEN24 4.0 Plus	4.0 kW
Primo GEN24 4.6 Plus	4.5 kW
Primo GEN24 5.0 Plus	4.5 kW
Primo GEN24 6.0 Plus	4.5 kW
Primo GEN24 8.0 Plus	4.5 kW
Primo GEN24 10.0 Plus	4.5 kW
Symo GEN24 3.0 Plus	2.56 kW
Symo GEN24 4.0 Plus	2.56 kW
Symo GEN24 5.0 Plus	2.56 kW
Symo GEN24 6.0 Plus	4.5 kW
Symo GEN24 8.0 Plus	4.5 kW
Symo GEN24 10.0 Plus	4.5 kW
Symo GEN24 12.0 Plus SC	4.5 kW
Verto Plus 15.0	6.55 kW
Verto Plus 17.5	6.55 kW
Verto Plus 20.0	6.55 kW
Verto Plus 25.0	6.55 kW
Verto Plus 30.0	6.55 kW
Verto Plus 33.3	6.55 kW

What these specifications mean

Fronius Reserva is listed with 21 published specifications from Fronius, including primo GEN24 3.0 plus of 3.0 kW, primo GEN24 3.6 plus of 3.6 kW, primo GEN24 4.0 plus of 4.0 kW and primo GEN24 4.6 plus of 4.5 kW. Those figures are what decide whether this unit fits your system, so read them against the equipment it will connect to before comparing price.

For a battery, the figures that matter most are system voltage: 12 V, 24 V and 48 V for low-voltage packs, or a high-voltage stack, continuous charge and discharge current, which limits how much power you can draw from the pack, cycle life at a stated depth of discharge, commonly 3,000–6,000 cycles for LiFePO4 and round-trip efficiency, around 90–95% for lithium and 75–85% for lead-acid. Storage is what turns a solar array from a daytime bill-reducer into a system that covers evening loads and rides through outages. It is normally the single most expensive component, so sizing it correctly matters more than with any other part.

Choosing a battery: the checks that matter

The checks below apply to any battery. Run them against the specification table above — most disappointing solar purchases are compatible-on-paper units that fail one of these in practice.

Leave room to expand. Packs that parallel cleanly let you add capacity later; ones that do not force a full replacement.
Compare usable kilowatt-hours, not nameplate capacity. A 100 Ah lead-acid battery at 12 V is nominally 1.2 kWh but only about 0.6 kWh is safely usable, while a 100 Ah LiFePO4 pack gives you roughly 1.0–1.2 kWh.
Size from your evening consumption. Add up what actually runs after sunset for the hours you want covered, then divide by the usable capacity per unit — that number, not the array size, sets how many batteries you need.
Check the continuous discharge rating against your inverter. A battery that stores plenty of energy but can only deliver 50 A cannot support a large inverter at full output.

Common mistakes

Installing lithium packs in an unventilated, hot enclosure. Sustained high temperature is the fastest way to lose cycle life.
Ignoring the charge current limit and pairing a large array with a small bank, which trips protection and shortens life.
Mixing old and new batteries, or different chemistries, in one bank. The weakest unit drags the whole bank down and can be damaged by the others.

Price and availability

Fronius Reserva is listed at £ 1,100 (GBP). Solar pricing moves with supply, import duties and exchange rates, and distributors set their own margins, so treat this as a comparison reference and confirm the current figure before you order.

SolarBazaar compares equipment rather than selling it. Shortlist here on specification and price, then buy from an authorised distributor or installer in your country: warranty cover on solar hardware is normally honoured through the channel you bought from, so confirm who supports Fronius locally before ordering.

Fronius Reserva — frequently asked questions

How much does Fronius Reserva cost?

Fronius Reserva is listed at £ 1,100 (GBP). The figure is indicative — solar prices move with supply, duties and exchange rates, and each distributor sets its own margin — so confirm the current price with a supplier before ordering.

What are the specifications of Fronius Reserva?

We hold 21 published specifications for this battery, including primo GEN24 3.0 plus 3.0 kW, primo GEN24 3.6 plus 3.6 kW, primo GEN24 4.0 plus 4.0 kW, primo GEN24 4.6 plus 4.5 kW and primo GEN24 5.0 plus 4.5 kW. The full table is on this page, listed under model FR-4.240.370.

Who makes Fronius Reserva?

Fronius Reserva is a Fronius product, listed under batteries with model reference FR-4.240.370. The Fronius brand page lists the rest of its range so you can compare across the catalogue.

Is Fronius Reserva right for my system?

That depends on what it has to connect to. For a battery, check usable capacity after depth of discharge — LiFePO4 typically allows 80–100%, lead-acid closer to 50%, system voltage: 12 V, 24 V and 48 V for low-voltage packs, or a high-voltage stack and continuous charge and discharge current, which limits how much power you can draw from the pack against the rest of your equipment before price enters the decision. Read the warranty in full: lithium warranties are stated as a term plus either a cycle count or a total energy throughput, and whichever limit arrives first ends the cover.

Where can I buy Fronius Reserva?

SolarBazaar lists and compares equipment rather than selling it. Use the specifications and price here to shortlist, then buy through an authorised distributor or installer — buying in-channel is what keeps the manufacturer's warranty valid.

Reviews

No reviews yet

Be the first to review this product.