Fronius Reserva: Is This Long-Awaited Solar Battery Worth It?
Quick Answer:
The Fronius Reserva is a reliable, well-built battery designed to pair seamlessly with Fronius Gen24 inverters. Ideal for existing Fronius owners seeking solid backup and smart design, it shines in smaller or mid-sized homes. However, limited capacity and delayed backup response mean it’s not for everyone.
Why the Fronius Reserva Matters
If you’re one of the thousands of Australians who already own a Fronius Gen24 inverter, the long-awaited Fronius Reserva might be exactly what you’ve been waiting for—a purpose-built solar battery solution that finally completes the system.
With growing demand for reliable backup power, energy independence, and smarter solar investments, the Reserva arrives as a solid—but not revolutionary—option.
At GI Energy, we’re big fans of Fronius inverters (we even have them on our own homes). But when it comes to their first battery, we’re here to give you an honest, no-fluff assessment: the good, the not-so-good, and whether it’s the right fit for your home.
What Is the Fronius Reserva?
The Fronius Reserva is a modular solar battery designed specifically to integrate with Fronius Gen24 hybrid inverters. Built for grid-connected homes seeking energy security and efficiency, it offers:
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Seamless compatibility with Gen24 inverters
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Slim profile (170mm depth)
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10-year warranty with 70% depth of discharge
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Black-start and three-phase backup
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Up to 62.8kWh capacity (with four towers on three-phase setups)
Fronius Reserva Features at a Glance
| Feature | Fronius Reserva |
|---|---|
| Compatibility | Gen24 Hybrid Inverter (Primo & Symo) |
| Capacity per Tower | 9.6kWh (1-phase) / 15.7kWh (3-phase) |
| Maximum Configurable Size | 38.4kWh (1-phase) / 62.8kWh (3-phase) |
| Dimensions | 1,745 x 570 x 170mm (per tower) |
| Mounting Options | Floor mount |
| Backup Power | Yes (Black Start + Three-Phase available) |
| Depth of Discharge | 94.5% |
| Warranty | 10 Years |
| Backup Delay | 10–30 seconds (non-instant) |
| Origin | Battery made in China, inverter in Austria |
Where the Reserva Shines
✅ Perfect for Existing Fronius Owners
If you already own a Gen24 hybrid inverter, the Reserva is a no-brainer to consider. It’s purpose-built to match, and that means simple integration, more reliable backup, and better support.
✅ Compact and Aesthetic
With a 170mm depth, sleek casing, the Reserva fits discreetly into modern homes. It’s ideal for garages or tight utility spaces.
✅ Strong Warranty and Safety
With 70% depth of discharge guaranteed for 10 years, Fronius is backing this battery with serious confidence. It’s also built to high European standards—even if assembled in China like most competitors.
✅ Flexible Placement
Up to 30m of cable distance between inverter and battery offers added flexibility for installations where ideal battery positioning might be tricky.
Where It Falls Short
❌ Limited Capacity for Single-Phase Homes
With a 9.6kWh cap per tower and up to 38.4kWh max (with four towers), it’s a decent offering—but modern households with EVs, all-electric appliances, or growing solar needs may find this limiting. Compare that to other brands offering up to 48kWh in a single stack.
❌ Delayed Backup (10–30 Seconds)
Unlike Tesla, Sigenergy or Sungrow systems that switch seamlessly, the Reserva introduces a delay when the power cuts out. That could mean lights flicker or TVs shut off—noticeable for some users, especially in homes relying on continuous power for servers or medical devices. This cab take up to 30 seconds.
❌ Not a Game-Changer in Innovation
There’s no EV DC integration, no ultra-fast charging, no AI-driven load shifting. It’s reliable, but not revolutionary. If you’re after bleeding-edge tech, other brands may be more appealing.
Who Is the Fronius Reserva Best For?
✅ You already own a Fronius Gen24 inverter
✅ You want a reliable, brand-aligned system
✅ You value aesthetic, compact battery designs
✅ You’re a low to mid-consumption household
✅ You want three-phase backup and strong warranty support
Real Talk From Our Team
We’ve worked with Fronius for years and love their inverters—rock-solid, well-supported, and built to last. The Reserva battery follows that same quality-first philosophy, but it’s not the most innovative battery on the market.
“It’s going to be a good product with some limitations.” – Daniel, GI Energy
It fills a crucial gap for Fronius loyalists but might not be suitable for high-demand households or those expecting zero-second backup and all-in-one functionality.
Can You Get a Rebate for Fronius Reserva?
Yes— The Reserva is eligible for the federal battery rebate. The actual rebate amount depends on your postcode, energy usage, and installer credentials.
Want to know what you’re eligible for?
Learn how you can get your solar federal rebate.
FAQs About the Fronius Reserva
Is the Fronius Reserva worth it?
Yes, if you already own a Fronius Gen24 inverter. It’s reliable, efficient, and backed by a strong brand—but may not suit high-energy users or those needing instant backup.
How much does the Fronius Reserva cost in Australia?
Expect $1,000 per kWh installed, depending on your configuration and before the battery rebate.
How long will the Fronius Reserva last?
Fronius offers a 10-year warranty with 70% depth of discharge, suggesting a practical lifespan of 10–15 years under typical use.
Can I use the Reserva without a Fronius inverter?
No, the Reserva only works with Fronius Gen24 hybrid inverters. It’s not compatible with other brands or AC-coupled setups.
Does the Fronius Reserva support EV charging?
Not directly. Unlike Tesla or other advanced systems, the Reserva doesn’t include EV integration—though external EV chargers can be used separately. The Fronius Watt Pilot will integrate with the overall system via the Gen24 inverter though.
Where is the Fronius Reserva made?
While Fronius inverters are made in Austria, the Reserva battery is manufactured in China. This brings it in line with industry norms while maintaining Fronius quality standards.
Key Takeaways
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The Fronius Reserva is best suited for current Fronius inverter owners
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It offers strong reliability, compact design, and good warranty terms
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However, it lacks instant backup, advanced features, and large single-phase capacity
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For the right home, it’s a solid option, but not a leap forward in innovation
Ready to See If Fronius Reserva Is Right for You?
Let’s design a system that fits your home, your lifestyle, and your budget.
✅ Request a tailored quote →
✅ Check your eligibility for rebates →
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About GI Energy
GI Energy is an award-winning Australian solar and battery installation company with over a decade of experience. Known for ethical practices, high-performance systems, and exceptional after-install support, GI Energy is trusted by homeowners, councils, schools, and major businesses nationwide.
Written by Daniel McCabe, founder and strategist at GI Energy. With over 16 years in the energy industry — from procurement to solar and holistic energy management — Daniel is focused on helping Australians take a balanced, long-term approach to their energy needs. His insights combine real-world experience with a strong belief in intelligent, ongoing support — not just one-off solar installs.
