--- title: "Fronius Verto 33.3 Grid-tie Inverter: Specs & Datasheet | ComparePV" description: "Fronius Verto 33.3 33.3 kW grid-tie inverter. Specs: 97.8% European efficiency, 4 MPPT, 1000 V max DC input, 41.8 kg." source: "https://comparepv.com/inverter/fronius-international-fronius-verto-33-3" updated: 2026-01-16 --- # Fronius Verto 33.3 ## Identity - **Manufacturer:** Fronius International - **Model:** Fronius Verto 33.3 - **Series:** Fronius Verto - **Rated AC power:** 33.3 kW - **Type:** Grid-tie - **Phases:** Three-phase ## How it compares Compared against 243 inverters from 30 to 100 kW. Ranks are within that class. | Measure | This inverter | Class median | Standing | Rank in class | | --- | --- | --- | --- | --- | | European efficiency | 97.8% | 98.2% | Weak - bottom 10% | 148 | | MPPT trackers | 4 | 4 | Typical | 34 | | Max DC input voltage | 1000 V | 1100 V | Typical | 125 | | Weight per kW | 1.3 | 1.1 | Typical | 145 | | Warranty | - | 5 yrs | | | ## Specification ### AC output - **Rated AC power:** 33.3 kW - **Max apparent power:** 33.30 kVA - **Phases:** Three-phase - **Nominal AC voltage:** 400 V - **Max AC current:** 50.5 A - **Grid frequency:** 50 Hz - **Power factor:** 0–1 ind./cap. - **Harmonic distortion (THD):** 1.0 % ### PV input - **Max DC input power:** 50.00 kW - **Max DC voltage:** 1000 V - **MPPT voltage range:** 150 to 870 V - **Start-up voltage:** 150 V - **MPPT trackers:** 4 - **Max input current per MPPT:** 28.0 A - **Max short-circuit current per MPPT:** 50.0 A ### Efficiency - **European efficiency:** 97.8 % - **Max efficiency:** 98.0 % ### Physical - **Dimensions:** 865 × 574 × 279 mm - **Weight:** 41.8 kg - **Enclosure:** IP66 - **Cooling:** forced-air - **Noise:** 56 dB - **Operating temperature:** -40 to 60 °C - **Max humidity:** 100 % - **Max altitude:** 4000 m ### Connectivity and protection - **Interfaces:** Wi-Fi, Ethernet - **Protocols:** Fronius Solar.web, Modbus TCP, JSON, 802.11b/g, RS485 Modbus RTU SunSpec (Fronius Smart Meter) - **Protection:** AFCI, DC switch, Surge protection ### Warranty and certificates - **Certifications:** IEC 62109-1/-2, VDE-AR-N 4105:2018, R25, EN 50549-1/-2, CEI 0-16, CEI 0-21, UNE 217002:2020, IEC 62116, IEC 61727, AS/NZS 4777.2:2020+A1, IEC 63027:2023, CE ### Pros - **4 independent MPPT with Dynamic Peak Manager** - Four MPPT trackers (each with 2 DC inputs, max 28 A/input) featuring a proprietary Dynamic Peak Manager algorithm allow for the management of strings with different orientations, angles, and varying levels of shading, without sacrificing energy yield from other strings. This is a significant advantage over inverters with 2 MPPT in the 15-33 kW segment. - **Arc Guard compliant with IEC 63027** - The built-in Arc Guard function detects and safely interrupts DC arcs in accordance with IEC 63027, without the need to install separate AFCI devices. In agricultural and multi-family installations, this reduces the risk of fire and simplifies technical inspections. - **SPD Type 1+2 DC and Type 2 AC in standard** - The integrated surge protection device (SPD) combining DC Type 1+2 and AC Type 2 protection is supplied as a complete unit (1+2 variant), eliminating the cost and time associated with installing separate surge protection devices. For outdoor installations (agriculture), this is a standard offering that many competitors often offer as a paid option. - **European efficiency ≥97.36%** - The Verto 33.3 achieves European efficiency of 97.36% and a maximum of 97.47% according to Fronius' official datasheet. Under typical Polish conditions (variable solar irradiance, frequent partial loads), the high efficiency at low and medium loads translates into a significantly higher annual energy yield than indicated by the Pmax value alone. - **IP66, operating temperature range: -40°C to +60°C** - The IP66 sealing class and operating temperature range of -40°C to +60°C with humidity levels of 0-100% allow for outdoor installation without the need for additional protective enclosures. Active cooling of the power electronics extends the lifespan of components in the typical summer overheating conditions often found on metal roofs. ### Cons - **The standard warranty is only 5 years.** - Standard protection covers 2 years + 3 years after the device is registered (totaling 5 years). Sungrow and Huawei offer a standard 10-year warranty without registration, which can be a deciding factor in institutional tenders and TCO analyses compared to competitors. - **Premium price: approximately 370 PLN/kW** - The Verto 30.0 (SPD 1+2) model costs approximately 11,100 PLN (~370 PLN/kW according to Polish distributors, 2025), placing the series in the higher price range of the three-phase segment. Tier-1 Chinese manufacturers (Sungrow, Huawei) with similar power ratings are priced significantly below this amount, which represents a real barrier for agricultural installations with limited budgets. ## About this series The Fronius **Verto** series are three-phase grid-connected inverters designed for installations where flexibility in the design is crucial and reliable operation under varying rooftop conditions is essential. What sets them apart are their **four independent MPPTs**, which facilitate managing multiple strings of modules with different orientations and tilting angles - and also improve energy yields when parts of the generator are periodically shaded. Additional support comes from the inverter's built-in **intelligent anti-islanding protection**, eliminating the need for extra components at the module level. In practice, their high European efficiency means better energy production under typical Polish operating conditions, not just in a laboratory setting. Monitoring is handled by **Fronius Solar.web and the application**, with communication via WiFi or Ethernet, along with remote diagnostics and update capabilities. Fronius Verto is primarily aimed at small businesses, agriculture, and multi-family buildings, where factors like safety, quick commissioning, grid certifications, and transparent warranty terms upon registration are paramount. ## Questions ### What does the MPPT (Maximum Power Point Tracking) feature of the Fronius Verto inverter mean for my solar panel system? The Fronius Verto features four independent MPPT (Maximum Power Point Tracking) systems, each capable of handling up to 28 A continuously. This means you can connect up to four strings of modules with different orientations or inclines (e.g., both a south-facing and an east-facing string) without sacrificing performance. Each MPPT system independently tracks the maximum power point, so the performance of one string does not negatively impact the performance of the others. ### What is the warranty on the Fronius Verto inverter, and how do I activate it? The standard factory warranty is 2 years. After registering the device on the Fronius Solar.web portal, the warranty is extended free of charge to 5 years (2+3 scheme). Fronius also offers optional packages for extending protection up to 20 years for an additional fee. Registration should be completed immediately after installation, as removing the inverter without the manufacturer's consent may result in the loss of warranty rights. ### Can the Fronius Verto system effectively handle partial shading on the roof without requiring additional optimizers? Yes. The Fronius Verto has built-in intelligent shading management directly within the inverter, eliminating the need to install optimizers at the module level. The four independent MPPTs allow for isolating the shaded portion of the array from the rest of the system. This is particularly useful in cases where chimneys, skylights, or neighboring buildings shade only a portion of the roof at certain times of day. ### Does the Fronius Verto system function effectively in winter and at low temperatures? Yes, the operating temperature range for the Fronius Verto inverters is from -40°C to +60°C, so Polish winters do not pose any problems for them. The IP66-rated enclosure protects the electronics from moisture, snow, and dust. The high European efficiency (up to approximately 97.9%) translates into good energy production, not just during sunny summers, but also during cloudy, winter days typical of the Polish climate. ### Which buildings and systems are Fronius Verto series best suited for? The Fronius Verto is a three-phase grid-tie inverter designed primarily for small businesses, agriculture, and multi-family buildings. Available power ratings from 15 kW to over 33 kW meet the needs of typical commercial installations. The inverter has the necessary grid certifications, which simplifies connection to the distribution network operator. It is not suitable for island operation without additional energy storage and a management system. ### How can I monitor the performance of a Fronius Verto inverter in real-time? The Fronius Verto communicates with the Fronius Solar.web platform via WiFi or Ethernet. The mobile app and web panel enable real-time monitoring of current production, generation history, operating status, and any potential errors. Remote diagnostics and software updates for the inverter are also possible without the need for a service technician, which reduces the operating costs of the installation. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/inverters/se-ds-fronius-verto-en-7d8078cc85ff.pdf) ## Alternatives | Inverter | Rated AC | Euro efficiency | MPPT | Weight | Difference | | --- | --- | --- | --- | --- | --- | | [SolarEdge SE33.3K](https://comparepv.com/inverter/solaredge-se33-3k) | 33.3 kW | 98.0% | | 32.0 kg | 9.8 kg lighter | | [SolarEdge SE33.3K (K33.3SE) – Three Phase Inverter for 277/480V Grid](https://comparepv.com/inverter/solaredge-solaredge-se33-3k-k33-3se-three-phase-inverter-for-277-480v-grid) | 33.3 kW | 98.0% | | 45.0 kg | 3.2 kg heavier | | [SolarEdge SE33.3K (K33.3SE) with DC Safety Unit (optional)](https://comparepv.com/inverter/solaredge-solaredge-se33-3k-k33-3se-with-dc-safety-unit-optional) | 33.3 kW | 98.0% | | 48.0 kg | 6.2 kg heavier | | [SolarEdge SE33.3KUS (KUS33.3SE)](https://comparepv.com/inverter/solaredge-se33-3kus-kus33-3se) | 33.3 kW | | | 45.0 kg | 3.2 kg heavier | | [Huawei SUN2000-33KTL-NH](https://comparepv.com/inverter/huawei-sun2000-33ktl-nh) | 33.3 kW | | 4 | 43.0 kg | 1.2 kg heavier | | [Growatt MID 33KTL3-X](https://comparepv.com/inverter/growatt-mid-33ktl3-x) | 33 kW | 98.5% | | 29.5 kg | -0.3 kW, +0.7 pp efficiency, 12.2 kg lighter | | [Sungrow SG33CX](https://comparepv.com/inverter/sungrow-sg33cx) | 33 kW | 98.3% | | 50.0 kg | -0.3 kW, +0.5 pp efficiency, 8.2 kg heavier | | [Sungrow SG33T-P2-CN](https://comparepv.com/inverter/sungrow-sg33t-p2-cn) | 33 kW | 98.3% | 3 | 25.0 kg | -0.3 kW, +0.5 pp efficiency, -1 MPPT | --- Source: https://comparepv.com/inverter/fronius-international-fronius-verto-33-3