The Sungrow SG20-25T-P2-CN series are three-phase grid-connected inverters designed for commercial and small industrial installations. They are engineered for stable operation under varying grid conditions and offer flexible string configurations. The inclusion of two independent MPPT systems facilitates dividing the PV generator into different rooftop sections, making it easier to minimize losses from partial shading or varying module orientations without complicating cabling.
A key feature is the high European efficiency, which translates to better energy yields under typical operating conditions in Poland, especially during periods when the installation rarely operates at full capacity. These inverters support modern monitoring features, including quick-start functions and remote supervision via the platform/application. Communication can be implemented, among other methods, through RS485 and the 4G module (depending on the configuration).
This is not a hybrid series - it does not directly integrate with energy storage systems like battery inverters. What sets it apart is its robust environmental protection (IP66), enhanced safety features, and compliance with local norms for the CN market.
Ranking
Specifications
Pros and cons
Sungrow ranked first in the BloombergNEF Inverter Bankability Survey 2025 with 100% lender recognition - marking the sixth consecutive year at the top. For commercial installations financed through loans or leasing, this translates to a lower risk of rejection by project-finance banks evaluating equipment selection.
With a transformerless design, inverters in this series achieve peak efficiency of 98.5-98.6%, placing them among the top performers in the 20-25 kW class. The estimated European efficiency of ~97.5-98% delivers measurably higher annual energy yields under Polish irradiation conditions (typically 900-1,100 kWh/m²/year), where installations rarely operate at full load.
IP66 rating provides full protection against dust ingress and powerful water jets, meeting outdoor installation requirements without an additional enclosure. At ~19 kg - owing to the absence of a transformer - the unit weighs several times less than legacy transformer-based units (30-55 kg), simplifying rooftop installation on commercial buildings without the need for specialized lifting equipment.
The CN variant supports systems up to 1,100 V DC - a higher threshold than the standard European 1,000 V - while the 160 V MPPT lower limit enables flexible string design for modules with Voc ~40 V, without the risk of tracker inactivity under low-irradiance conditions at dawn and dusk.
Dual-channel communication - RS485 for local SCADA/BMS integration and an optional 4G module for remote monitoring - eliminates the need to run additional LAN cabling in distributed installations. The Sungrow iSolarCloud platform enables real-time monitoring and remote firmware updates.
The CN suffix denotes compliance with GB/T grid standards for the Chinese market, not with European standards EN 50549-1/-2 or VDE-AR-N 4105/4110. Grid connection in Poland requires certification in accordance with the DSO's IRiESD requirements and a CE declaration of conformity - neither of which the CN variant holds. For installations in Poland, the appropriate product is the corresponding European variant of this inverter family (without the CN suffix).
Some competitors in this power class - such as the SMA Tripower STP 20-50 with 3 MPPTs - offer an additional tracker, enabling full separation of three roof sections with different orientations without string mismatch losses. On complex commercial rooftops with more than two orientations, 2 MPPTs may require design compromises or the use of power optimizers.
Alternatives
About the SG20-25T-P2-CN series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.