--- title: "Sungrow SG333HX Grid-tie Inverter: Specs & Datasheet | ComparePV" description: "Sungrow SG333HX 333 kW grid-tie inverter. Specs: 98.8% European efficiency, 12 MPPT, 1500 V max DC input, 116.0 kg." source: "https://comparepv.com/inverter/sungrow-sg333hx" updated: 2026-01-16 --- # Sungrow SG333HX ## Identity - **Manufacturer:** Sungrow - **Model:** SG333HX - **Series:** SG333HX - **Rated AC power:** 333 kW - **Type:** Grid-tie - **Phases:** Three-phase ## How it compares Compared against 95 inverters from 100 to 500 kW. Ranks are within that class. | Measure | This inverter | Class median | Standing | Rank in class | | --- | --- | --- | --- | --- | | European efficiency | 98.8% | 98.6% | Strong - top 21% | 5 | | MPPT trackers | 12 | 10 | Strong - top 14% | 3 | | Max DC input voltage | 1500 V | 1100 V | Strong - top 24% | 1 | | Weight per kW | 0.3 | 0.6 | Strong - top 8% | 8 | | Warranty | - | 5 yrs | | | ## Specification ### AC output - **Rated AC power:** 333 kW - **Max apparent power:** 333.00 kVA - **Phases:** Three-phase - **Nominal AC voltage:** 800 V - **Max AC current:** 240.5 A - **Grid frequency:** 50 Hz - **Power factor:** 0.8 leading – 0.8 lagging (PF > 0.99 at nominal power) - **Harmonic distortion (THD):** 3.0 % ### PV input - **Max DC voltage:** 1500 V - **MPPT voltage range:** 500 to 1500 V - **Start-up voltage:** 550 V - **MPPT trackers:** 12 - **Max input current per MPPT:** 40.0 A - **Max short-circuit current per MPPT:** 60.0 A ### Efficiency - **European efficiency:** 98.8 % - **Max efficiency:** 99.0 % ### Physical - **Dimensions:** 870 × 1136 × 361 mm - **Weight:** 116.0 kg - **Enclosure:** IP66 - **Cooling:** forced-air - **Operating temperature:** -30 to 60 °C - **Max humidity:** 100 % - **Max altitude:** 4000 m ### Connectivity and protection - **Interfaces:** Bluetooth, Display - **Protocols:** RS485, PLC, Bluetooth (via APP) - **Protection:** DC switch, Surge protection ### Warranty and certificates - **Certifications:** IEC 62109, IEC 61727, IEC 62116, IEC 60068, IEC 61683, EN 50549-2 ### Pros - **Up to 16 Independent MPPT Channels** - The inverter features up to 16 MPPT trackers (2 strings each), enabling plant designs with varied azimuth and tilt angles without significant mismatch losses. Competing platforms at comparable power ratings - e.g., the SMA Sunny Highpower Peak3 - offer up to 12 MPPTs, making the SG333HX the stronger choice for installations with trackers or irregular field layouts. - **Maximum Efficiency of 99.02%** - The peak efficiency of 99.02%, confirmed by the V6 datasheet (December 2023), places the series at the top of the 300+ kW string inverter class. The transformerless design minimizes thermal losses and reduces standby self-consumption, directly translating into higher annual energy yield under European operating conditions. - **Stable Operation at SCR ≥ 1.15** - The inverter maintains stable operation at a grid short-circuit ratio (SCR) of ≥ 1.15 and a reactive power response time of \< 30 ms. This is a critical capability for plants sited near weak grid connection points or in industrial zones with variable power quality - a segment where many competing inverters require additional filters or reactive compensators. - **Smart IV Curve Diagnostics via PLC Without Additional Wiring** - Built-in I-V curve diagnostics for PV strings are performed over a PLC (Power Line Communication) network, eliminating the need for separate signal cabling between communication modules and the inverter. This enables remote detection of module faults, blocked bypass diodes, and degradation, reducing O&M costs for utility-scale plants. - **IP66 Rating and -30…+60°C Operating Range** - The IP66 ingress protection rating and wide operating temperature range (-30 to +60°C) qualify the series for outdoor installation without climate-controlled enclosures, even in continental and subarctic climates. This lowers project CAPEX compared to solutions requiring additional thermostated housing. ### Cons - **20 A/String Limit Against 700 W+ Modules** - The maximum input current per string is 20 A. With modern bifacial modules in the 700-730 Wp class (Isc ~18-19.5 A plus a 5-15% bifacial gain), this value is close to the design limit, requiring string configuration verification for every project. Competing inverters in this power class - e.g., the Huawei SUN2000-330KTL-H1 - support 26 A/string, providing a significantly larger design margin. ## About this series The Sungrow SG333HX series are industrial grid-tie inverters designed for large-scale PV installations - farms, carports, and tracker systems. Their standout feature is the **multi-channel MPPT architecture**, enabling flexible connections of strings with different orientations and tilts, while minimizing losses during partial shading. This truly simplifies the design of large module fields and ensures stable energy yields under variable conditions. In practice, the SG333HX boasts **high European efficiency**, reflecting typical operating conditions in Europe. This translates to better annual energy production, not just during ideal moments. For service and O&M, key functions include diagnostic tools (including string characteristic analysis) and comprehensive insulation protection and monitoring. Communication and monitoring are possible via popular wired interfaces and integration with the manufacturer's platform, facilitating remote supervision. This solution caters to investors and contractors who demand **stable operation in challenging grid conditions**, compliance with grid requirements, and typical, long-term warranties for the C&I segment. ## Questions ### How many MPPT channels does the Sungrow SG333HX inverter have, and why does it matter? The Sungrow SG333HX features 12 independent MPPT inputs in the standard configuration, or optionally 16 MPPT inputs, supporting input currents of up to 40 A or 30 A per channel, respectively. This architecture allows string arrays with different orientations, tilt angles, or string lengths to be connected without significant energy losses. In practice, this translates to greater flexibility in PV plant design and higher energy yields under partial shading conditions or non-uniform irradiance exposure. ### What is the European efficiency of the Sungrow SG333HX inverter? The European efficiency of the SG333HX is 98.8%, while the peak efficiency reaches 99.02%. European efficiency is a weighted-average metric that accounts for variable irradiance conditions typical of European climates - not just full-load operation. As a result, the inverter generates more energy over the course of a full year, particularly during spring and autumn when solar irradiance levels are lower. ### Is the Sungrow SG333HX suitable for installations with solar trackers? Yes, the SG333HX was designed with large-scale utility and industrial installations in mind, including systems equipped with single-axis and dual-axis solar trackers. Its multi-channel MPPT architecture with a maximum DC input voltage of 1500 V is well suited to the dynamically changing angle of incidence inherent to tracking systems. The inverter is compatible with modules rated 500 Wp and above, which is the standard for modern tracker-based PV plants. ### What warranty does the Sungrow SG333HX inverter carry? The standard warranty for the SG333HX is 5 years from the date of purchase. Sungrow, as a Bloomberg NEF Tier 1 manufacturer, offers the option to purchase an extended warranty. For C&I and utility-scale PV projects, it is advisable to include an extended warranty in the project budget, as an unplanned replacement of an inverter at this power class can generate substantial downtime costs for the installation. ### What is the operating temperature range of the Sungrow SG333HX, and will it perform reliably during summer in Poland? The SG333HX operates across a temperature range of -30°C to 60°C, covering both harsh Polish winters and hot summer conditions. It should be noted that at ambient temperatures above 35°C, the inverter's output power is derated to approximately 320 kVA - which is standard practice for devices in this power class. The IP66-rated enclosure provides full protection against dust ingress and heavy rain. ### Through which interfaces can the Sungrow SG333HX be monitored remotely? The SG333HX supports communication via RS485 and Ethernet, enabling integration with Sungrow's iSolarCloud platform as well as SCADA systems via the Modbus TCP protocol. This allows plant operators and O&M companies to monitor device performance, analyze I-V string characteristics, and respond to alarms without requiring a physical site visit. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/inverters/ds-20250617-sg333hx-datasheet-v6-en-e57e584d7cac.pdf) ## Alternatives | Inverter | Rated AC | Euro efficiency | MPPT | Weight | Difference | | --- | --- | --- | --- | --- | --- | | [Growatt MAX 333K-X](https://comparepv.com/inverter/growatt-max-333k-x) | 333 kW | 98.5% | 6 | 126.0 kg | -6 MPPT, 10.0 kg heavier | | [SolarEdge TerraMax Inverter SE330K](https://comparepv.com/inverter/solaredge-solaredge-terramax-inverter-se330k) | 330 kW | 98.8% | | 175.0 kg | -3.0 kW, 59.0 kg heavier | | [SOFAR 330KTLX0](https://comparepv.com/inverter/sofar-solar-sofar-330ktlx0) | 330 kW | 98.8% | | 113.0 kg | -3.0 kW, 3.0 kg lighter | | [Growatt MAX 320K-X](https://comparepv.com/inverter/growatt-max-320k-x) | 320 kW | 98.5% | 6 | 126.0 kg | -13.0 kW, -6 MPPT, 10.0 kg heavier | | [Sungrow SG320HX](https://comparepv.com/inverter/sungrow-sg320hx) | 320 kW | | 12 | 116.0 kg | -13.0 kW | | [Sungrow SG350HX-US](https://comparepv.com/inverter/sungrow-sg350hx-us) | 320 kW | | 12 | 122.0 kg | -13.0 kW, 6.0 kg heavier | | [GoodWe GW320K-UT](https://comparepv.com/inverter/goodwe-gw320k-ut) | 320 kW | | 15 | 124.0 kg | -13.0 kW, +3 MPPT, 8.0 kg heavier | | [GoodWe GW320KH-UT](https://comparepv.com/inverter/goodwe-gw320kh-ut) | 320 kW | | 15 | 124.0 kg | -13.0 kW, +3 MPPT, 8.0 kg heavier | --- Source: https://comparepv.com/inverter/sungrow-sg333hx