The Sungrow SG350HX series are grid-connected (on-grid) string inverters designed for large commercial and industrial installations, where high yield, flexible string design, and rapid diagnostics matter. The use of multiple MPPTs facilitates working with different module orientations and minimizes losses due to partial shading - especially in farms with irregular table geometries or varying tilts. High European efficiency means more energy realistically fed into the grid under typical climatic conditions in Poland, not just in the lab.
A key feature of this series is the intelligent I-V curve diagnostics and O&M support functions, which make it easier to detect string performance drops without time-consuming field measurements. For monitoring and integration with higher-level systems, standard communication interfaces (e.g., RS485) are available, and in distributed PV projects, PLC communication is also useful. The construction emphasizes safety - with built-in protections and constant insulation monitoring. The SG350HX series is an excellent choice for EPCs and investors seeking stable grid operation and efficient service and warranty for the project segment.
Ranking
Specifications
Pros and cons
The series supports up to 16 MPPT trackers with a 20 A per-string input current, enabling direct connection of 500 Wp+ bifacial modules without string paralleling. For installations with irregular tracker geometry or mixed azimuths and tilt angles, this minimizes inter-MPPT losses compared to inverters offering only 8-10 MPPTs in the same power class.
The rated European efficiency of 98.8% (peak up to 99%) places the SG350HX among the top-tier 350 kW string inverters, on par with the Huawei SUN2000-330KTL-H1. Under typical Polish climatic conditions - characterized by frequent partial irradiance - European efficiency translates directly into annual energy yield.
The built-in I-V curve scan and diagnostic function enables remote identification of underperforming strings, eliminating the need for on-site service visits with a handheld analyzer. For a plant with dozens of inverters, this significantly reduces O&M costs by removing the need for time-consuming manual measurements at each scheduled inspection.
The inverter maintains stable operation at a short-circuit ratio (SCR) of ≥ 1.16 with a reactive power response time below 30 ms. This is particularly relevant for Polish PV plants connected to medium-voltage grids at locations with limited fault level capacity, where standard inverters may exhibit instability or oscillations.
A maximum DC input voltage of 1500 V allows longer string configurations - more modules per string - reducing the quantity of DC cabling, combiner boxes, and installation labor by an estimated 15-20% compared to 1000 V DC systems, directly lowering the CapEx of utility-scale installations.
The SG350HX weighs approximately 111 kg, while the comparable Huawei SUN2000-330KTL-H1 comes in at around 100 kg - roughly 11% lighter. On commercial rooftop installations or in hard-to-access locations, this requires mechanical lifting equipment, adding to overall installation costs.
The Smart IV Curve function operates exclusively in conjunction with Sungrow's proprietary data logger (iSolarCloud). In projects using a third-party SCADA system or a multi-vendor monitoring platform, a parallel integration is required, increasing the complexity of the plant's IT architecture and potentially incurring additional licensing costs.
Alternatives
About the SG350HX series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.