--- title: "Sungrow SG320HX Grid-tie Inverter: Specs & Datasheet | ComparePV" description: "Sungrow SG320HX 320 kW grid-tie inverter. Specs: 12 MPPT, 1500 V max DC input, 116.0 kg." source: "https://comparepv.com/inverter/sungrow-sg320hx" updated: 2026-01-16 --- # Sungrow SG320HX ## Identity - **Manufacturer:** Sungrow - **Model:** SG320HX - **Series:** SG320HX - **Rated AC power:** 320 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 | - | 98.6% | | | | MPPT trackers | 12 | 10 | Strong - top 14% | 3 | | Max DC input voltage | 1500 V | 1100 V | Strong - top 24% | 1 | | Weight per kW | 0.4 | 0.6 | Strong - top 10% | 10 | | Warranty | - | 5 yrs | | | ## Specification ### AC output - **Rated AC power:** 320 kW - **Max AC power:** 352.00 kW - **Max apparent power:** 352.00 kVA - **Phases:** Three-phase - **Nominal AC voltage:** 800 V - **Max AC current:** 254.0 A - **Grid frequency:** 50 Hz - **Power factor:** 0.8 leading ~ 0.8 lagging - **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 - **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:** 5000 m ### Connectivity and protection - **Interfaces:** Bluetooth, Display - **Protocols:** RS485, PLC, Bluetooth (APP) - **Protection:** DC switch, Surge protection ### Warranty and certificates - **Certifications:** IEC 62109-1, IEC 62109-2, IEC 61727, IEC 62116, GB/T 19964, NB/T 32004-2018, CGC/GF 035-2013, CNCA/CTS 0002-2014, Q/GDW 1617-2015, GB/T 32826-2016, GB/T 32892-2016, GB/T 37408-2019 ### Pros - **99.01% Peak Efficiency - Class-Leading Performance** - According to the manufacturer's datasheets, the SG320HX achieves a peak efficiency of 99.01%, outperforming direct competitors in the ~320 kW class - the Huawei SUN2000 equivalent series reaches ~98.6% and the SMA CORE2 ~98.7%. This 0.3-0.4 percentage point advantage translates into measurably higher annual energy yield at utility-scale PV plants. - **Up to 16 Independent MPPT Trackers** - Depending on the variant, the inverter supports 12 MPPT inputs for 210 mm modules or 14/16 MPPT inputs for 182 mm modules, with a 40 A input current per tracker (compatible with 500 Wp+ modules). This high MPPT granularity minimizes losses from uneven irradiance across different roof sections or under partial shading conditions. - **IP66 Ingress Protection + C5 Corrosion Category** - The IP66-rated enclosure combined with anti-corrosion category C5 enables deployment in coastal zones, chemical environments, and industrial sites without the need for additional external enclosures. This is a significant advantage over competing products in the same power class that offer only C3/C4 protection. - **1500 V DC Architecture + DC 2-in-1 Combiner** - The 1500 V DC architecture with an MPPT voltage range of 500-1500 V and an integrated DC 2-in-1 switch-disconnector allows the use of longer PV strings, reducing DC cabling quantities and balance-of-system (BoS) infrastructure costs - estimated savings of 15-20% compared to 1000 V systems at equivalent plant capacity. - **Reactive Power Response Time \<30 ms + PLC Communication** - The inverter meets stringent grid operator requirements for dynamic reactive power (Q) support - response time below 30 ms - and supports PLC-based communication, eliminating the need for a separate communication cable run. This simplifies grid connection acceptance testing on utility-scale projects and reduces O&M infrastructure costs. ### Cons - **116 kg Unit Weight - Lifting Equipment Required** - The unit weighs 116 kg with dimensions of 870×1136×361 mm, making a pallet truck or crane necessary for mounting on the support structure. At sites with restricted access - such as industrial rooftops - this increases installation logistics costs compared to lighter, modular inverter designs offered by competing manufacturers. - **In-Country Service Handled Through Distributor Network** - Sungrow does not operate a dedicated service office in Poland; technical support is provided through authorized distributors backed by a support center in Germany. Compared to European manufacturers with local service infrastructure (SMA Polska, Fronius Polska), this arrangement may result in longer response times and reduced spare-parts availability in the event of a critical fault. ## About this series The Sungrow SG320HX series are **grid-tie inverters (on-grid) for large commercial and industrial installations**, designed to maximize energy yield in challenging field conditions. A key feature is the **multi-string MPPT architecture (depending on the version, up to several trackers)**, which facilitates managing strings on different panels, varying tilt angles, and partial shading - enabling the installation to operate more stably and produce more energy annually. High **European efficiency** means significantly lower conversion losses under typical operating conditions in Poland, translating to a higher yield per kWh from the modules. The series supports advanced O&M functions, such as string diagnostics and I-V curve scanning, speeding up problem location. It uses communication methods including PLC, and monitoring is possible remotely (with system integration). The casing, with **high-grade sealing and corrosion resistance**, aids outdoor operation, while the wide range of network certifications facilitates acceptance in farm projects. This is the choice for investors seeking to minimize downtime and service costs. ## Questions ### How many MPPT trackers does the Sungrow SG320HX inverter have, and why does that matter for a utility-scale PV plant? Depending on the variant, the SG320HX series offers up to 12-16 independent MPPT trackers. In practice, this means that strings routed across different roof sections, azimuths, or areas subject to partial shading can operate independently of one another. For installations on irregular terrain or sites with shading obstacles, energy losses are significantly lower than with a single- or dual-MPPT inverter. ### What is the efficiency of the Sungrow SG320HX, and does it translate into real-world energy savings? The SG320HX achieves a maximum efficiency of 99.01%, placing it among the top-performing utility-scale string inverters on the market. A high European efficiency rating means reduced conversion losses throughout the year, not just at peak irradiance. For installations in the multi-hundred-kilowatt range, even a 0.3-0.5 percentage point difference in efficiency can amount to thousands of additional kilowatt-hours per year. ### What does diagnostics and servicing look like for the Sungrow SG320HX in a large-scale installation? The SG320HX supports I-V curve scanning of individual strings and intelligent string-current monitoring without requiring an on-site service visit. Communication interfaces include RS485, PLC (reducing cabling requirements), Wi-Fi, and GPRS. Remote firmware updates are also supported. As a result, plant operators can pinpoint a faulty module or string without dispatching a service crew, significantly reducing operations and maintenance costs. ### Is the Sungrow SG320HX suitable for operation under Polish winter climate conditions? Yes. The inverter's operating temperature range of -30 °C to +60 °C makes Polish winters a non-issue. The enclosure carries an IP66 ingress protection rating, safeguarding the electronics against rain and snow ingress. Active cooling is provided by internal fans, and the enclosure features enhanced corrosion resistance designed for long-term outdoor operation. ### What is the warranty on the Sungrow SG320HX, and can it be extended? The standard manufacturer's warranty on Sungrow commercial inverters, including the SG320HX series, is 5 years. Sungrow offers optional extended warranty packages that can stretch coverage to up to 25 years. As a Tier 1 manufacturer with a global service network, Sungrow ensures parts availability and technical support in both the Polish and broader European markets. ### What is the difference between the Sungrow SG320HX and the SG320HX-20, and which one should you choose? The SG320HX-20 is a newer iteration of the series, optimized for large-format modules using 182 mm (M10) and 210 mm (G12) cells. Both variants share the same rated output power of 320 kW and a DC input voltage of 1,500 V; however, the SG320HX-20 may feature an adapted MPPT configuration and string input layout tailored to the higher operating currents of next-generation modules. The choice between the two depends on the module technology specified in the project. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/inverters/ds-20221121-sg320hx-v15-cn-8cfae4b8b1dc.pdf) ## Alternatives | Inverter | Rated AC | Euro efficiency | MPPT | Weight | Difference | | --- | --- | --- | --- | --- | --- | | [Growatt MAX 320K-X](https://comparepv.com/inverter/growatt-max-320k-x) | 320 kW | 98.5% | 6 | 126.0 kg | -6 MPPT, 10.0 kg heavier | | [Sungrow SG350HX-US](https://comparepv.com/inverter/sungrow-sg350hx-us) | 320 kW | | 12 | 122.0 kg | 6.0 kg heavier | | [GoodWe GW320K-UT](https://comparepv.com/inverter/goodwe-gw320k-ut) | 320 kW | | 15 | 124.0 kg | +3 MPPT, 8.0 kg heavier | | [GoodWe GW320KH-UT](https://comparepv.com/inverter/goodwe-gw320kh-ut) | 320 kW | | 15 | 124.0 kg | +3 MPPT, 8.0 kg heavier | | [SolarEdge TerraMax Inverter SE330K](https://comparepv.com/inverter/solaredge-solaredge-terramax-inverter-se330k) | 330 kW | 98.8% | | 175.0 kg | +10.0 kW, 59.0 kg heavier | | [SOFAR 330KTLX0](https://comparepv.com/inverter/sofar-solar-sofar-330ktlx0) | 330 kW | 98.8% | | 113.0 kg | +10.0 kW, 3.0 kg lighter | | [Sungrow SG333HX](https://comparepv.com/inverter/sungrow-sg333hx) | 333 kW | 98.8% | 12 | 116.0 kg | +13.0 kW | | [Growatt MAX 333K-X](https://comparepv.com/inverter/growatt-max-333k-x) | 333 kW | 98.5% | 6 | 126.0 kg | +13.0 kW, -6 MPPT, 10.0 kg heavier | --- Source: https://comparepv.com/inverter/sungrow-sg320hx