--- title: "Fronius International Symo Advanced 12.5-3-M Grid-tie Inverter: Specs & Prices | ComparePV" description: "Fronius International Symo Advanced 12.5-3-M 12.5 kW grid-tie inverter: 1 shop offer from 2 799.99 €. Specs: 97.4% European efficiency, 2 MPPT." source: "https://comparepv.com/inverter/fronius-international-symo-advanced-12-5-3-m" updated: 2026-10-10 --- # Fronius International Symo Advanced 12.5-3-M ## Identity - **Manufacturer:** Fronius International - **Model:** Symo Advanced 12.5-3-M - **Series:** Fronius Symo Advanced - **Rated AC power:** 12.5 kW - **Type:** Grid-tie - **Phases:** Three-phase ## Price offers Prices are the figure each shop printed, on that shop's side of VAT. | Shop | Market | Price | Per kW | Availability | Last read | | --- | --- | --- | --- | --- | --- | | [tab-solar.com](https://comparepv.com/go/99821) | Spain | 2 799.99 € incl. VAT | 224 €/kW | Not stated | Last read 11 Oct 00:44 | ## How it compares Compared against 227 inverters from 12 to 30 kW. Ranks are within that class. | Measure | This inverter | Class median | Standing | Rank in class | | --- | --- | --- | --- | --- | | European efficiency | 97.4% | 98.0% | Weak - bottom 20% | 138 | | MPPT trackers | 2 | 2 | Typical | 53 | | Max DC input voltage | 1000 V | 1000 V | Typical | 101 | | Weight per kW | 2.8 | 1.6 | Weak - bottom 12% | 196 | | Warranty | - | 5 yrs | | | ## Specification ### AC output - **Rated AC power:** 12.5 kW - **Max apparent power:** 12.50 kVA - **Phases:** Three-phase - **Nominal AC voltage:** 400 V - **Max AC current:** 18.9 A - **Grid frequency:** 50 Hz - **Power factor:** 0–1 ind. / cap. ### PV input - **Max DC input power:** 18.80 kW - **Max DC voltage:** 1000 V - **MPPT voltage range:** 200 to 800 V - **Start-up voltage:** 200 V - **MPPT trackers:** 2 ### Efficiency - **European efficiency:** 97.4 % - **Max efficiency:** 97.8 % ### Physical - **Dimensions:** 725 × 510 × 225 mm - **Weight:** 35.4 kg - **Enclosure:** IP66 - **Cooling:** forced-air - **Operating temperature:** -25 to 60 °C - **Max humidity:** 100 % - **Max altitude:** 3400 m ### Connectivity and protection - **Interfaces:** Wi-Fi, Ethernet - **Protocols:** WLAN, Ethernet LAN, Fronius Solar.web, Modbus TCP (SunSpec), Fronius Solar API (JSON), USB (Type A), RS422 (Fronius Solar Net), S0-Meter interface, RS485 Modbus RTU (SunSpec) - **Protection:** AFCI, DC switch ### Warranty and certificates - **Certifications:** IEC 62109-1/-2, IEC 62116, IEC 61727, VDE 0126-1-1/A1, VDE AR-N 4105, G98/1, G99/1, AS/NZS 4777.2, UNE 206007-1, CEI 0-21, CEI 0-16, NRS 097-2-1, TOR Erzeuger Typ A, VDE AR-N 4110, EN 50549-1/-2, IEC 61683, IEC 60068, IEC 63027:2023 ### Pros - **2 MPPT + DC over-sizing up to 150%** - Two independent MPPT (Maximum Power Point Tracking) trackers with a wide DC voltage range of 200-800 V and the ability to over-spec on the DC side up to 150% of the nominal AC power, allow for the design of strings in various roof orientations without compromising performance. This is an important parameter for commercial installations with uneven roof geometries. - **Dynamic Peak Manager - active shadow compensation** - The integrated Dynamic Peak Manager algorithm scans the I-V characteristics of the modules and dynamically searches for the global maximum power point, which minimizes losses under partial shading and uneven illumination - without the need for additional module-level optimization. - **Integrated WiFi/LAN + Solar.web monitoring** - The native WiFi and Ethernet interface allows connection to the Fronius Solar.web platform without the need for an additional datalogger, reducing setup time and system monitoring costs. Remote access, alerts, and detailed production reports are available through the web browser and mobile app. - **Extendable warranty up to 20 years** - Upon registering the product within 30 months of installation with Fronius, customers are granted an extension of the standard warranty (5 years) to 20 years. This represents a significant advantage over manufacturers that offer only 5- or 10-year warranties, particularly for commercial and industrial installations where the total cost of ownership (TCO) planning extends to 15-25 years. - **EN50549 and NC RfG certifications** - Having EN50549-1/-2 and NC RfG (Network Code Requirements for Generators) certifications is a formal requirement for connecting to OSD distribution networks in Poland for installations exceeding 11 kW AC. Symo Advanced meets these requirements from the factory, eliminating the need for additional certification costs. ### Cons - **Active fan-based cooling** - Symo Advanced utilizes forced-air cooling, while the competitive SMA Tripower X and newer Fronius GEN24 Plus inverters, up to 15 kW, use passive or hybrid cooling systems. The fan is the only moving part of the inverter, and it is statistically the most common component to fail after several years of operation - particularly in dusty environments. - **Maximum efficiency ~97.9% - below the top segment** - The maximum efficiency of 97.8-97.9% (according to Fronius/Krannich Solar datasheets) is lower than the current leaders in the three-phase segment: Huawei SUN2000-10KTL-M1 (~98.6%) and SMA Tripower Core1 (~98.4%). The difference of approximately 0.5-0.7% corresponds to measurable losses over a year, especially for large installations exceeding 15 kW. - **No support for energy storage (only on-grid operation)** - Symo Advanced is a purely grid-connected inverter without the ability to connect batteries - unlike the Fronius GEN24 Plus and Huawei SUN2000-10KTL-M1, which support DC-coupled storage. Given the rising costs of energy and the increasing popularity of home/commercial storage, the lack of this feature may require replacing the inverter when expanding the system with batteries. ## About this series The Fronius Symo Advanced series comprises three-phase grid-connected inverters (on-grid) designed for installations where stable operation, flexible string design, and rapid diagnostics are crucial. In practice, their two independent MPPTs stand out, facilitating high yields on rooftops with different orientations or where partial shading occurs - each tracker can operate at its own optimal point, rather than compromising the entire field's production. An embedded **Dynamic Peak Manager** algorithm helps maintain the optimal operating point even under uneven solar irradiation, while high **European efficiency** means significantly lower losses under typical operating conditions in Poland, resulting in better annual production, not just under ideal sunlight. Integrated communication and monitoring are also advantageous - connection via WiFi or Ethernet, compatibility with Fronius Solar.web, and convenient configuration from the application level. For investments requiring formal compliance, readily available certificates (including EN50549 and NC RfG) and the ability to register and extend warranty are significant. This is an excellent choice for larger homes as well as commercial and industrial installations where operational control and resilience to complex installation conditions are key. ## Questions ### Is the Fronius Symo Advanced still available for sale? The Fronius Symo Advanced series is gradually being phased out of active sales by the manufacturer. New units may be available from distributors with remaining stock, but these are not from the current Fronius production line. If you prioritize long-term support and up-to-date certifications, it is advisable to consider the newer generation of Fronius inverters, such as the Symo GEN24 line. ### What capabilities are available in the Fronius Symo Advanced series, and which installations are they suitable for? The series includes models ranging from 10 kW to 20 kW (including 10, 12.5, 15, 17.5, and 20 kW), making it a good choice for larger residential, commercial, and industrial installations powered by three-phase networks. Installations with a power output exceeding 10 kW require notification to the network distributor and possession of the necessary certifications, which Symo Advanced holds. ### Does the Fronius Symo Advanced meet the certification requirements in Poland, such as NC RfG and EN50549? Yes, inverters from the Fronius Symo Advanced series (models 10-20 kW) have a certificate of compliance with EN50549-1 and meet the requirements of the NC RfG (German Network Agency) in Poland. This allows them to be legally connected to the distribution grid. Certification documents are available directly on the Fronius website, in the technical support section. ### What are the benefits of having two independent MPPT (Maximum Power Point Tracking) systems in a Fronius Symo Advanced inverter, and when do they truly make a difference? Two independent MPPT (Maximum Power Point Tracking) trackers allow you to connect panels from different roof sections or with different orientations and inclines to a single inverter without significant performance loss. In practice, if one part of the panels is shaded (e.g., by a chimney, a skylight, or a neighboring building), the second MPPT operates at its optimal point, rather than reducing the output of the entire string. This is particularly important for roofs with irregular shapes. ### What is the efficiency of the Fronius Symo Advanced, and does this matter when choosing a string inverter? The European efficiency rating for Symo Advanced inverters is approximately 97.1% (for the 10 kW model), which indicates very low conversion losses under real operating conditions in Poland, where cloudy weather and variable sunlight are common. The higher the European efficiency rating, the more energy from the panels reaches the grid or consumers throughout the year, not just during sunny southern afternoons. ### How does monitoring and diagnostics work in the Fronius Symo Advanced? The inverter has an integrated Wi-Fi module and Ethernet port, which allow connection to the Fronius Solar.web platform without additional devices. The app enables monitoring of current production, historical data, and service alerts. An RS485 and Modbus TCP interface is also available, which is useful for integration with BMS or SCADA energy management systems in commercial installations. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/inverters/se-ds-fronius-symo-advanced-en-b05608f40488.pdf) ## Alternatives | Inverter | Rated AC | Euro efficiency | MPPT | Weight | Difference | | --- | --- | --- | --- | --- | --- | | [SolarEdge SE12.5K](https://comparepv.com/inverter/solaredge-se12-5k) | 12.5 kW | 97.7% | | 30.7 kg | 4.7 kg lighter | | [SolarEdge SE12.5K (Three Phase)](https://comparepv.com/inverter/solaredge-solaredge-se12-5k-three-phase) | 12.5 kW | 97.7% | | 33.2 kg | 2.2 kg lighter | | [Fronius Primo 12.5-1](https://comparepv.com/inverter/fronius-international-fronius-primo-12-5-1) | 12.5 kW | | 2 | 37.4 kg | 2.0 kg heavier | | [Fronius Symo 12.5-3 480](https://comparepv.com/inverter/fronius-international-fronius-symo-12-5-3-480) | 12.5 kW | | | 35.5 kg | Similar on paper | | [Growatt MOD 12KTL3-X](https://comparepv.com/inverter/growatt-mod-12ktl3-x) | 12 kW | 98.2% | 2 | 14.0 kg | -0.5 kW, +0.8 pp efficiency, 21.4 kg lighter | | [Growatt MOD 13KTL3-X](https://comparepv.com/inverter/growatt-mod-13ktl3-x) | 13 kW | 98.2% | 2 | 16.0 kg | +0.5 kW, +0.8 pp efficiency, 19.4 kg lighter | | [Growatt MOD 12KTL3-X2(Pro)](https://comparepv.com/inverter/growatt-mod-12ktl3-x2-pro) | 12 kW | 98.2% | 2 | 15.6 kg | -0.5 kW, +0.8 pp efficiency, 19.8 kg lighter | | [Sungrow SG12KTL-M](https://comparepv.com/inverter/sungrow-sg12ktl-m) | 12 kW | 98.1% | 2 | 20.0 kg | -0.5 kW, +0.7 pp efficiency, 15.4 kg lighter | --- Source: https://comparepv.com/inverter/fronius-international-symo-advanced-12-5-3-m