--- title: "Sungrow SG50CX Grid-tie Inverter: Specs & Datasheet | ComparePV" description: "Sungrow SG50CX 50 kW grid-tie inverter. Specs: 98.4% European efficiency, 1100 V max DC input, 62.0 kg." source: "https://comparepv.com/inverter/sungrow-sg50cx" updated: 2026-01-16 --- # Sungrow SG50CX ## Identity - **Manufacturer:** Sungrow - **Model:** SG50CX - **Series:** SG33/40/50CX - **Rated AC power:** 50 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 | 98.4% | 98.2% | Strong - top 18% | 22 | | MPPT trackers | - | 4 | | | | Max DC input voltage | 1100 V | 1100 V | Typical | 3 | | Weight per kW | 1.2 | 1.1 | Typical | 143 | | Warranty | - | 5 yrs | | | ## Specification ### AC output - **Rated AC power:** 50 kW - **Max AC power:** 55.00 kW - **Max apparent power:** 55.00 kVA - **Phases:** Three-phase - **Nominal AC voltage:** 400 V - **Max AC current:** 83.6 A - **Grid frequency:** 50 Hz - **Power factor:** 0.8 leading – 0.8 lagging - **Harmonic distortion (THD):** 3.0 % ### PV input - **Max DC voltage:** 1100 V - **MPPT voltage range:** 200 to 1000 V - **Start-up voltage:** 250 V - **Max input current per MPPT:** 26.0 A - **Max short-circuit current per MPPT:** 40.0 A ### Efficiency - **European efficiency:** 98.4 % - **Max efficiency:** 98.7 % ### Physical - **Dimensions:** 645 × 782 × 310 mm - **Weight:** 62.0 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, WLAN (optional), Ethernet (optional), Bluetooth (via app) - **Protection:** DC switch, Surge protection ### Warranty and certificates - **Certifications:** IEC 62109, IEC 61727, IEC 62116, IEC 60068, IEC 61683, VDE-AR-N 4105:2018, VDE-AR-N 4110:2018, IEC 61000-6-3, EN 50549-1/2, AS/NZS 4777.2:2015, CEI 0-21 2019, CEI 0-16 2019, VDE 0126-1-1/A1 VFR 2019, UTE C15-712-1:2013, DEWA, UNE 206007-1/RD 1699, UNE 217001, Israel certificate, G99 ### Pros - **Peak Efficiency of 98.7%** - The datasheet confirms a maximum efficiency of 98.7%, placing this series among the top performers in the three-phase string inverter class of 33-50 kW. European efficiency hovers around 98.4%, translating into tangible energy yield gains under the variable irradiance conditions characteristic of Central European climates. - **Up to 5 Independent MPPTs** - The SG50CX features 5 independent MPPT inputs (SG40CX - 4, SG33CX - 3), each supporting up to 2 strings. In practice, this enables installations across multiple roof orientations without the need for power optimizers, minimizing system-level mismatch losses under partial shading conditions. - **IP66 Enclosure + Corrosion Class C5** - The IP66-rated enclosure with C5 corrosion resistance per ISO 12944 permits installation in industrial, coastal, and high-humidity environments without additional external enclosures - a higher standard than the typical IP65 rating offered by several competitors in this power class. - **Built-in Type II DC and AC SPD** - Type II surge protection devices (SPD) on both the DC and AC sides are factory-integrated, eliminating the need for separate surge arresters and simplifying the electrical design - particularly valuable in commercial installations where every additional component represents an added cost and potential failure point. - **Integrated PID Recovery and Bifacial Compensation** - The native PID recovery function protects modules susceptible to potential-induced degradation without external devices. Support for bifacial modules - accounting for elevated Isc values - was uncommon in the commercial segment at the time of the series launch in 2019, making it a forward-looking feature at the time of its introduction. ### Cons - **Production Discontinued ~2022** - The SG33/40/50CX series was discontinued around 2022 in favor of its successor, the SG36/40/50CX-P2. Availability of spare parts, communication modules, and manufacturer technical support will progressively decline - a significant concern given 10-year service warranties typical of C&I installations. - **58 kg Unit Weight - Two-Person Installation Required** - The unit weighs 58 kg with dimensions of 782×645×310 mm, requiring at least two installers and dedicated lifting equipment. The newer SG50CX-P2 successor retains a comparable weight, whereas competing platforms (e.g., Fronius Eco 25-50 kW) offer modular designs or lighter constructions. ## About this series The Sungrow SG33/40/50CX series are **three-phase grid-tie string inverters** designed for commercial and industrial installations, where high performance, design flexibility, and efficient service support are key. Their main advantage is featuring up to **5 independent MPPT channels** - making it easier to divide strings across different roof sections, orientations, and tilts, and minimizing losses from partial shading without needing optimizers throughout the entire system. In practice, high **European efficiency** also helps, meaning truly excellent performance in typical operating conditions in Poland, translating to more stable energy production throughout the year. The series offers **remote startup and updates** and diagnostic functions (including I-V curve scan and analysis), reducing O&M response time. Monitoring and communication can operate wirelessly (optional WiFi) or via standard cable-based solutions, with everything supported by an installation management platform. The enclosure features high sealing, anti-surge protection, and compliance with network requirements, facilitating easy installation. ## Questions ### How many MPPT trackers does the Sungrow SG50CX inverter have, and why does that matter for a commercial installation? The Sungrow SG33/40/50CX features up to 5 independent MPPT trackers. In practice, this means that string arrays installed on different roof sections with varying orientations or tilt angles operate independently of one another. Partial shading on one section does not reduce the yield of the remaining sections. For commercial installations on large, non-uniform rooftops, this translates into real energy savings without the need to install costly power optimizers on every individual panel. ### What is the warranty on the Sungrow SG33CX/SG40CX/SG50CX inverter? The standard manufacturer's warranty for the SG33/40/50CX series is 5 years. Sungrow offers an optional extended warranty of up to 10 years. The company ranks among the global top-tier (Tier 1) inverter manufacturers and maintains a dedicated service and technical support presence in Poland - a significant factor when selecting an inverter for a commercial installation with a long operational horizon. ### Can the Sungrow SG50CX inverter be monitored remotely without an on-site service visit? Yes. The SG33/40/50CX series supports communication via RS485, with optional Wi-Fi and Ethernet connectivity. The inverter enables remote commissioning, firmware updates, and remote diagnostics - including I-V curve scanning and analysis. This means that the majority of operational issues can be diagnosed, and often resolved, without dispatching a technician to the site, which significantly reduces system downtime. ### What is the operating temperature range of the Sungrow SG33CX, and does it perform reliably in Polish winters? The inverter operates across a temperature range of -30°C to +60°C, which fully covers Polish climatic conditions. Cooling is provided by smart forced-air cooling, with the fan activating adaptively based on load. Standby power consumption at night is as low as 2 W, and a high European efficiency rating ensures effective operation even under the low irradiance levels typical of Polish winter months. ### What protection features does the Sungrow SG40CX include, and does it meet grid connection requirements in Poland? The SG33/40/50CX series is equipped with Type II DC- and AC-side surge protection devices (SPDs), integrated short-circuit protection, residual current protection, and an IP66 ingress protection rating. A version with corrosion protection class C5 is available for industrial and coastal environments. The inverter holds certification for compliance with European grid requirements, which facilitates acceptance testing and grid connection approval with distribution network operators in Poland. ### Is the Sungrow SG50CX inverter compatible with bifacial solar panels? Yes, the SG33/40/50CX series is compatible with bifacial modules. The built-in PID recovery function protects panels against potential-induced degradation, which is particularly relevant for high-voltage and bifacial modules. The inverter's peak efficiency of 98.7%, combined with the higher energy yield of bifacial panels, delivers a favorable overall energy balance for utility-scale and industrial installations. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/inverters/ds-20210206-sg33cx-sg40cx-sg50cx-including-premium-datasheet-99d1fe235bb4.pdf) ## Alternatives | Inverter | Rated AC | Euro efficiency | MPPT | Weight | Difference | | --- | --- | --- | --- | --- | --- | | [Huawei SUN2000-50KTL-JPM0](https://comparepv.com/inverter/huawei-sun2000-50ktl-jpm0) | 50 kW | 98.6% | 6 | 71.0 kg | 9.0 kg heavier | | [Huawei SUN2000-50KTL-M0](https://comparepv.com/inverter/huawei-sun2000-50ktl-m0) | 50 kW | 98.5% | 6 | 74.0 kg | 12.0 kg heavier | | [Solis-50K-HV](https://comparepv.com/inverter/ginlong-solis-solis-50k-hv) | 50 kW | 98.5% | 4 | 61.0 kg | 1.0 kg lighter | | [Growatt MAX 50KTL3 LV](https://comparepv.com/inverter/growatt-max-50ktl3-lv) | 50 kW | 98.4% | | 82.0 kg | 20.0 kg heavier | | [Solis-50K](https://comparepv.com/inverter/ginlong-solis-solis-50k) | 50 kW | 98.4% | 4 | 63.0 kg | 1.0 kg heavier | | [SOFAR 50000TL](https://comparepv.com/inverter/sofar-solar-sofar-50000tl) | 50 kW | 98.3% | 3 | 68.0 kg | 6.0 kg heavier | | [Sungrow SG50CX-P2](https://comparepv.com/inverter/sungrow-sg50cx-p2) | 50 kW | 98.3% | 4 | 41.0 kg | 21.0 kg lighter | | [Fronius Tauro 50-3-D (Direct)](https://comparepv.com/inverter/fronius-international-fronius-tauro-50-3-d-direct) | 50 kW | 98.3% | | 92.0 kg | 30.0 kg heavier | --- Source: https://comparepv.com/inverter/sungrow-sg50cx