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Fronius International Fronius Primo GEN24 7.7 208-240 [Plus]
Fronius International

Fronius Primo GEN24 7.7 208-240 [Plus]

7.68 kW Hybrid Single-phase Battery-ready
Compare with closest alternative Datasheet PDF
Rated AC (kW)
7.68
Weak · bottom 14%
Euro eff. (%)
-
Not published
MPPT
2
Typical · median 2
Max DC (V)
600
Weak · bottom 24%
Weight (kg)
20.9
Typical · median 20.9 kg
Warranty (yrs)
-
Not published

The Fronius Primo GEN24 series comprises single-phase grid-tie inverters with backup power functionality, designed with maximum flexibility in mind for domestic PV systems. The built-in PV Point ensures selected circuits remain powered even during a grid outage - without requiring an energy storage system. The GEN24 Plus variants take it a step further: these are hybrid inverters, compatible with energy storage systems, enabling full backup power once properly equipped with appropriate switching.

The 2 MPPT feature simplifies designing rooftop systems with different orientations and helps minimize losses from partial shading. High European efficiency ensures stable energy production under real-world conditions, not just in the lab. Monitoring and communication via Fronius Solar.web (including remotely, from the app) facilitate tracking of generation, autarky, and diagnostics. This is the choice for demanding prosumers and small commercial projects, where reliability, compatibility, and grid resilience matter.

Ranking

266 inverters from 6 to 12 kW
Metric This inverter Median Position in class Rank in class
European efficiency - 97.6% Not published -
MPPT trackers 2 2 Typical 46
Max DC input voltage 600 V 1000 V Weak · bottom 24% 161
Weight per kW 2.7 2.3 Typical 167
Warranty - 5 yrs Not published -
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Specifications

Open datasheet PDF
Rated AC power 7.68 kW Continuous output
Max apparent power 7.68 kVA
Phases Single-phase
Nominal AC voltage 240 V 208/220/240 Vac (-12% / +10%)
Max AC current 36.9 A
Grid frequency 60 Hz Range 45–66 Hz
Power factor 0.8–1 ind./cap.
Harmonic distortion (THD) 3.5 %
Max DC input power 8.00 kW DC/AC ratio 1.04
Max DC voltage 600 V Caps the string length
MPPT voltage range 200 to 480 V
Start-up voltage 80 V
MPPT trackers 2
Max efficiency 97.5 % Best single operating point
CEC efficiency 97.0 % California Energy Commission weighting
Battery port Yes
Battery voltage 150–455 Vdc
Max charge current 22.0 A
Max discharge current 22.0 A
Dimensions 583 × 529 × 180 mm Height × width × depth
Weight 20.9 kg 2.7 kg per kW
Enclosure Type 4X
Cooling forced-air
Operating temperature -40 to 60 °C
Max humidity 100 %
Max altitude 4000 m
Interfaces Wi-FiEthernet
Protocols Fronius Solar.webModbus TCPFronius Solar API (JSON)Modbus RTU (third-party via Fronius Smart Meter WR / Modbus RTU)
Protection AFCIDC switch
Certifications UL 1741 Third Edition (incl. UL1741 Supplement SA and SB)UL CRD - Non-Isolated EPS Interactive PV Inverters Rated Less Than 30kVAUL1998 (for functions: AFCI, RCMU, PVRSE and isolation monitoring)IEEE 1547:2018 incl. IEEE 1547a:2020IEEE 1547.1:2020IEEE 1547:2003 incl. IEEE 1547.1:2005ANSI/IEEE C62.41FCC Part 15 A & BCSA C22.2 No. 107.1-16 (reaffirmed 2021)CSA C22.2 No.290-19CSA C22.2 No.330-23CSA C22.3 No.9:20UL1699B:2021

Pros and cons

5 positive · 3 caution
What owners get
PV Point - a battery-free backup

The integrated PV Point provides up to 3 kW to a dedicated circuit solely from solar energy during grid outages - without an energy storage system. This is a unique feature in the segment of single-phase grid-tie tier-1 inverters, which is not available in comparable models such as SMA Sunny Boy or Huawei SUN2000-S0.

Efficiency of up to 99.1% (European standard: 97.9%)

The maximum efficiency is 99.1%, and the European efficiency for this series (which is crucial for Polish solar conditions) reaches 97.9% for the 10 kW variant. This places the series among the leaders in the single-phase segment, exceeding the typical 97.0-97.5% efficiency of competitors in this power range.

Two independent MPPT (Maximum Power Point Tracking) systems

Two MPPT trackers allow you to connect strings with different azimuths or roof angles without significant coupling losses. This is particularly valuable in Polish installations on pitched roofs (E/W) or in situations with partial shading from chimneys.

Modular design - quick maintenance

The design allows for component replacement without the need to replace the entire device. According to independent installer reviews (SolarQuotes.com.au, 2024), Fronius is a leader in on-site service, and replacement parts are delivered within 3-5 working days, which reduces downtime for installations.

Monitoring of Solar.web + scalability (UP.storage)

The Fronius Solar.web platform provides remote diagnostics, self-consumption analysis, and real-time alerts. The GEN24 Plus variant can also be activated for full backup mode through the UP.storage software update, which protects the investment from becoming obsolete.

Trade-offs
Battery compatibility: only BYD HVS/HVM

The only officially certified energy storage system is the BYD Battery-Box Premium HVS/HVM (5-22 kWh, up to 3 modules in parallel). The lack of support for popular alternatives (Pylontech, Solax Triple Power, Huawei LUNA2000) limits the flexibility in choosing a system and negotiating prices when upgrading.

A full backup requires additional equipment.

The full backup system for the entire house is not activated by default - it requires the purchase of an external installation switch and a paid Fronius UP.storage software update. Competitors, such as SMA Sunny Tripower Smart Energy, offer this full functionality as standard, without any additional implementation costs.

Shutter speed range: 15-35 seconds

According to technical documentation and user reports (forum.cleanenergyreviews.info, 2024), switching from network mode to emergency mode takes 15-35 seconds. This represents a brief interruption in power supply that is unacceptable for sensitive equipment (NAS servers, pumps with electronics), where systems with online UPS are required.

Inverter Power Euro eff. MPPT Weight Difference
Fronius International Fronius Primo GEN24 7.7 208-240 [Plus] 7.68 kW - 2 20.9 kg You are here
SUN-7.6K-SG05LP1-EU 7.6 kW 96.5% 2 24.0 kg 3.1 kg heavier
SUN-7.6K-SG01LP1-EU 7.6 kW 96.5% 2 30.0 kg 9.1 kg heavier
MIN 7600TL-XH-US 7.6 kW - 2 14.7 kg 6.2 kg lighter
SE8000H 8 kW 99.0% - 19.6 kg +0.3 kW, 1.2 kg lighter
MOD 8000TL3-XH 8 kW 98.1% 2 14.0 kg +0.3 kW, 6.9 kg lighter
MOD 8000TL3-HU 8 kW 98.1% 2 19.0 kg +0.3 kW, 1.9 kg lighter
SUN5000-8K-MAP0 8 kW 98.0% 2 21.0 kg +0.3 kW
SUN2000-8KTL-M1 8 kW 98.0% 2 17.0 kg +0.3 kW, 3.9 kg lighter

About the Fronius Primo GEN24 series

6 answered

These answers cover the whole series. Where a figure differs, the specification above is this model's own.

What are the key differences between the Fronius Primo GEN24 and the Fronius Primo GEN24 Plus?
The basic GEN24 version is a grid-tie inverter with an integrated PV Point function, providing backup power for a single circuit up to 3 kW per day, without the need for a battery storage system. The GEN24 Plus variant takes this further: it is a full-fledged hybrid inverter with a battery input, ready for use with energy storage systems such as BYD Battery-Box Premium HVS or HVM. This allows GEN24 Plus to provide complete backup power, independent of the time of day.
How does the PV Point function in the Fronius Primo GEN24, and does it actually operate without batteries?
Yes, PV Point is a unique feature of Fronius that does not require a battery storage system. When the grid goes down, the inverter switches the isolated outlet or circuit to power from the PV panels, up to 3 kW. The switching time is less than 90 seconds. The limitation is that it only works during the day, when the modules generate sufficient power. This allows you to power a router, laptop, or refrigerator during short power outages.
Which energy storage systems are compatible with the Fronius Primo GEN24 Plus?
The Fronius Primo GEN24 Plus is officially compatible with BYD Battery-Box Premium HVS (5.1-10.2 kWh) and HVM (8.3-22.1 kWh) high-voltage battery storage systems. Up to 3 battery modules can be connected in a cascade to a single inverter. The overall efficiency of the Fronius GEN24 Plus and BYD system reaches approximately 94%, resulting in significant cost savings compared to many competing systems.
What warranty does the manufacturer offer on Fronius Primo GEN24 inverters?
The standard warranty is 5 years, with the option to extend it free of charge to 10 years (5+5) upon registering the device on the Fronius Solar.web platform. Fronius is an Austrian manufacturer with a strong market position, and warranty service is provided through an authorized network of partners in Poland. The extended warranty covers defects in materials and workmanship of the inverter.
What is the European efficiency rating of the Fronius Primo GEN24, and what does this mean in practice?
The European efficiency rating for the GEN24 series inverters ranges from approximately 96.7% for versions with a power output of 3 kW or higher, approaching 97-98% at higher power levels. The European efficiency rating is a more important indicator than the peak rating, as it is calculated based on actual operating conditions in a moderate climate, taking into account operation under partial load. In practice, this means minimal energy loss due to heat and stable production throughout the year.
Is the Fronius Primo GEN24 suitable for installations on roofs with varying orientations or partial shading?
Yes. The Primo GEN24 series features two independent MPPT (Maximum Power Point Tracking) inputs, allowing you to connect two separate strings of panels with different orientations, tilt angles, or lengths. Each MPPT tracker independently searches for the point of maximum power, so shading of one part of the roof (e.g., by a chimney or skylight) does not significantly reduce the power output of the other. This is a significant advantage for typical pitched roofs and for more complex prosumer installations.
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