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.
Ranking
Specifications
Pros and cons
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.
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.
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.
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.
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.
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.
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.
Alternatives
About the SG320HX series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.