--- title: "SolarEdge SE33.3K (K33.3SE) – Three Phase Inverter for 277/480V Grid Grid-tie Inverter: Specs & Datasheet | ComparePV" description: "SolarEdge SE33.3K (K33.3SE) – Three Phase Inverter for 277/480V Grid 33.3 kW grid-tie inverter. Specs: 98.0% European efficiency, 1000 V max DC input." source: "https://comparepv.com/inverter/solaredge-solaredge-se33-3k-k33-3se-three-phase-inverter-for-277-480v-grid" updated: 2026-01-16 --- # SolarEdge SE33.3K (K33.3SE) – Three Phase Inverter for 277/480V Grid ## Identity - **Manufacturer:** SolarEdge - **Model:** SolarEdge SE33.3K (K33.3SE) – Three Phase Inverter for 277/480V Grid - **Series:** SolarEdge K33.3SE - **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 | 98.0% | 98.2% | Typical | 99 | | MPPT trackers | - | 4 | | | | Max DC input voltage | 1000 V | 1100 V | Typical | 125 | | Weight per kW | 1.4 | 1.1 | Typical | 157 | | Warranty | 20 yrs | 5 yrs | Strong - top 5% | 1 | ## Specification ### AC output - **Rated AC power:** 33.3 kW - **Max apparent power:** 33.30 kVA - **Phases:** Three-phase - **Nominal AC voltage:** 480 V - **Max AC current:** 40.0 A - **Grid frequency:** 60 Hz - **Power factor:** Configurable (range not specified) ### PV input - **Max DC input power:** 50.00 kW - **Max DC voltage:** 1000 V - **MPPT voltage range:** 680 to 1000 V - **Max input current per MPPT:** 40.0 A ### Efficiency - **European efficiency:** 98.0 % - **Max efficiency:** 98.1 % ### Physical - **Dimensions:** 540 × 315 × 260 mm - **Weight:** 45.0 kg - **Enclosure:** IP65 - **Cooling:** forced-air - **Noise:** 55 dB - **Operating temperature:** -40 to 60 °C ### Connectivity and protection - **Interfaces:** Wi-Fi, Ethernet - **Protocols:** RS485, Ethernet, Wi‑Fi (requires external antenna), ZigBee (optional), Cellular (optional) - **Protection:** AFCI, DC switch, Surge protection ### Warranty and certificates - **Warranty:** 20 years - **Certifications:** IEC 62109, IEC 62103, EN 50178, AS 3100, BDEW, CEI 0-16, IEC 61000-6-2, IEC 61000-6-3, IEC 61000-3-11, IEC 61000-3-12, RoHS, UTE C15-712-1 ### Pros - **98.3% Peak Efficiency (98% European Efficiency)** - A peak efficiency of 98.3% and a European efficiency of 98% place the SE33.3K at the top of the three-phase 30-35 kW inverter segment, well above the class median of approximately 97.6-97.8%. Under Central European climate conditions, European efficiency directly translates into real annual energy yield gains, particularly during the frequent periods of partial irradiance. - **Module-Level Monitoring** - The integrated data receiver aggregates telemetry from SolarEdge power optimizers and enables per-panel production visibility within the mySolarEdge platform via Ethernet or Wi-Fi. This capability shortens fault diagnostics and allows module-level performance verification - critical in commercial and multi-family residential installations with distributed arrays. - **Fixed DC Bus Voltage Architecture** - The fixed DC bus voltage topology allows designers to configure longer strings while maintaining a stable MPP operating point regardless of temperature swings or irradiance fluctuations. In practice, this reduces DC-side conversion losses compared to conventional three-phase inverters - an advantage particularly relevant during Central European winters with low temperatures and variable irradiance. - **Flexible String Configuration Under Shading** - With P-series power optimizers, partial shading of a single module does not degrade the output of the entire string. The architecture also supports mixing modules of different orientations and tilt angles within a single system - a tangible advantage for installations on complex multi-faceted commercial rooftops. - **12-Year Standard Warranty (Extendable to 25 Years)** - The standard 12-year manufacturer warranty significantly exceeds the baseline coverage offered by key commercial-segment competitors: Fronius Symo Advanced and SMA Tripower Core both ship with 5-year standard warranties. The option to extend coverage to 20 or 25 years simplifies the structuring of long-term O&M agreements for commercial PV projects. ### Cons - **Serious Manufacturer Financial Instability** - Between 2024 and 2025, SolarEdge conducted 4 rounds of layoffs totaling approximately 2,200 positions (>40% of its workforce), its stock lost ~95% of its value from the 2022 peak, the energy storage division was shut down, and the company replaced its CEO. These developments pose a tangible risk of reduced technical support and diminished spare-parts availability over the inverter's expected 10-15 year operational lifetime. - **Ecosystem Lock-In and Power Optimizer Cost Premium** - Full feature functionality of the series - including module-level monitoring and shade compensation - requires SolarEdge P-series power optimizers (~€40-60 per unit). For a 33.3 kW installation (~90 modules), this represents an additional €3,600-5,400 in BoS cost compared to competing multi-MPPT inverters (e.g., Huawei SUN2000-33KTL-M5 with 4 MPPTs, Fronius Symo Advanced) that require no additional per-module hardware. ## About this series SolarEdge K33.3SE series are three-phase grid-tie inverters designed for larger installations - from extensively expanded homes to commercial properties, including multi-family buildings. A key distinguishing feature of SolarEdge is its approach based on **constant working voltage**, which simplifies the design of long cable runs and helps maintain system stability under varying conditions. Another crucial advantage is **module-level optimization** - by working with combiner boxes, it minimizes losses during partial shading and allows flexible connection of modules with different orientations and tilts, rather than penalizing the entire string due to the weakest panel. In terms of performance, high European efficiency is significant - it refers to the inverter’s real-world effectiveness in Poland’s typical climate conditions. This translates to lower conversion losses and better annual energy production. A strong point is also the **SolarEdge monitoring** with installation performance viewing (including per-module) and flexible communication - via Ethernet or wireless solutions, depending on the configuration. The K33.3SE series is not a hybrid inverter - energy storage is typically handled via AC-side solutions when the project requires it. ## Questions ### What type of installations is the SolarEdge K33.3SE inverter designed for, and is it suitable for a single-family home? The SolarEdge K33.3SE is a three-phase inverter rated at 33.3 kW, designed primarily for larger applications such as multi-family residential buildings, commercial facilities, warehouses, and agricultural properties. For a typical single-family home with a 5-15 kW system, it is generally oversized. However, it may be appropriate for large homes with high energy consumption or for buildings served by multiple three-phase metering points. ### What is the warranty on the SolarEdge K33.3SE inverter, and can it be extended? The SolarEdge K33.3SE comes with a standard 12-year warranty. The manufacturer offers extended warranty packages that can increase coverage to 20 or even 25 years. This places the K33.3SE among the inverters with the longest standard warranty terms in the three-phase commercial segment, effectively reducing the risk of out-of-pocket service costs over the full lifecycle of the installation. ### Does the SolarEdge K33.3SE require power optimizers, and what does that mean in practice? The K33.3SE is designed to operate with SolarEdge power optimizers, although it can technically function without them. When power optimizers are used, each panel operates independently, meaning that shading on one module does not reduce the output of the entire string. This also allows modules with different orientations and roof tilt angles to be combined within the same installation, and monitoring provides individual panel-level performance data. ### What is the efficiency of the SolarEdge K33.3SE inverter, and how does it affect annual energy yield? The SolarEdge K33.3SE achieves a peak efficiency of approximately 98%. Its high European efficiency rating reflects real-world conversion losses under Polish climate conditions, where the inverter operates at partial load for the majority of the year. A high European efficiency translates to lower losses under diffuse irradiance conditions, resulting in better annual yield figures compared to inverters of similar rated power but lower part-load efficiency. ### Does the SolarEdge K33.3SE support energy storage, and is it a hybrid inverter? No, the SolarEdge K33.3SE is not a hybrid inverter and does not include a built-in DC battery interface. If a project requires energy storage, it must be implemented on the AC side via a separate battery inverter connected to the AC bus. For installations where battery integration is a requirement from the outset, the dedicated SolarEdge hybrid inverter product line should be considered instead. ### What communication and monitoring capabilities does the SolarEdge K33.3SE inverter offer? The SolarEdge K33.3SE supports several communication options: Ethernet and Wi-Fi are included as standard, with RS485, Zigbee, and GSM available as optional interfaces. Device configuration is performed via the SolarEdge SetApp on a smartphone, eliminating the need for a physical display on the unit. System data is transmitted to the SolarEdge monitoring platform, where production can be tracked in real time. When power optimizers are deployed, the platform also provides individual module-level performance visibility. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/inverters/se-three-phase-inverter-for-277-480-grid-setapp-datasheet-53d35e5e6983.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 | 13.0 kg lighter | | [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 | 3.0 kg heavier | | [Fronius Verto 33.3](https://comparepv.com/inverter/fronius-international-fronius-verto-33-3) | 33.3 kW | 97.8% | 4 | 41.8 kg | 3.2 kg lighter | | [SolarEdge SE33.3KUS (KUS33.3SE)](https://comparepv.com/inverter/solaredge-se33-3kus-kus33-3se) | 33.3 kW | | | 45.0 kg | Similar on paper | | [Huawei SUN2000-33KTL-NH](https://comparepv.com/inverter/huawei-sun2000-33ktl-nh) | 33.3 kW | | 4 | 43.0 kg | 2.0 kg lighter | | [Growatt MID 33KTL3-X](https://comparepv.com/inverter/growatt-mid-33ktl3-x) | 33 kW | 98.5% | | 29.5 kg | -0.3 kW, +0.5 pp efficiency, 15.5 kg lighter | | [Sungrow SG33CX](https://comparepv.com/inverter/sungrow-sg33cx) | 33 kW | 98.3% | | 50.0 kg | -0.3 kW, 5.0 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, 20.0 kg lighter | --- Source: https://comparepv.com/inverter/solaredge-solaredge-se33-3k-k33-3se-three-phase-inverter-for-277-480v-grid