The GoodWe SDT G4 series are three-phase grid-tie inverters designed for residential and small commercial installations, where reliable operation, high yield, and ease of use are essential. Thanks to two independent MPPTs, you can flexibly connect strings of modules with different orientations or partial shading, while the inverter continuously optimizes the point of maximum power, minimizing energy losses. The high European efficiency ensures significantly better real-world performance in typical operating conditions in Poland - not just in the lab, but also under varying weather and load conditions.
The SDT G4 series also stands out for its focus on safety: features such as arc fault detection (AFCI) and surge protection are available, enhancing the overall system’s reliability. For daily monitoring of operation, online monitoring via SEMS and communication through Wi-Fi or Ethernet (depending on configuration) facilitate diagnostics and maintenance. This is the series for investors seeking refined automation, grid compliance, and a reliable manufacturer’s warranty.
Ranking
Specifications
Pros and cons
According to the ENF Solar SDT G4 datasheet, the series achieves a maximum efficiency of 98.6-98.7%, placing it among the top performers in the 15-33 kW class of string inverters. This exceeds the efficiency of products such as the SMA Sunny Tripower Core1 (~98.5%) and many Huawei SUN2000 models (~98.6%). Higher maximum efficiency directly translates to lower conversion losses under optimal solar conditions.
The SDT G4 has an IP66 certification (full protection against dust and strong water jets), while most competing three-phase inverters (Fronius Symo, SMA STP) offer IP65. This difference is significant when installing in harsh weather conditions or near agricultural dust.
GoodWe has been officially recognized by BloombergNEF as a Tier 1 inverter manufacturer in Q2 2025, confirming its bankability in projects with non-recourse financing. The cumulative installed capacity exceeds 100 GW globally (Q1 2025 data), making the brand one of the largest in the world and minimizing counterparty risk for long-term installations.
The available arc fault detection (AFC) function responds with an alarm in the SEMS portal and by disconnecting the circuit - a requirement that is increasingly being demanded by insurers and fire codes. The built-in Class II surge protection reduces the number of external components in the DC enclosure.
Remote monitoring via the SEMS portal (web browser and mobile app) with WiFi or Ethernet connectivity provides remote diagnostics without the need for on-site service visits. GoodWe has an office in Poland (Kalisz), which shortens the warranty service process compared to brands without a local presence.
The SDT G4 series includes models ranging from 15-33 kW, which means it is not suitable for the dominant group of Polish prosumer installations (5-10 kW three-phase). Installers need to use SDT G2/G3 or DNS G4 series for smaller installations - SDT G4 specifically targets the small-commercial segment, rather than typical single-family homes.
Alternatives
About the SDT G4 series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.