The GoodWe SDT G2 series are three-phase grid-tie inverters designed for home and small commercial installations, prioritizing high energy production and convenient service. In practice, their compact design facilitates installation, with solutions enhancing design flexibility - this inverter effectively handles DC overloading, allowing module selection tailored to your roof's actual conditions without 'strangling' the system.
A noteworthy feature is the dual MPPT, which helps maximize energy harvest from different roof orientations or partial shading - independent power point tracking limits losses where a conventional setup would be less stable. High European efficiency translates to better performance in Poland's typical weather conditions, yielding more kWh annually, not just in ideal "laboratory" scenarios.
Monitoring is supported by the SEMS ecosystem - communicating via WiFi or Ethernet (depending on configuration) and accessible via an app. Optional safety features like AFCI support compliance and installation protection, while warranty programs can extend product coverage.
Ranking
Price offers
| Shop | Country | Price | Per kW | Stock | Offer updated | Link to shop |
|---|---|---|---|---|---|---|
| Sklep Soltech | Poland | 3 424.48 zł net | 342.45 zł/kW | Not stated | 3h ago | Visit shop |
| www.solar-outlet.nl | Netherlands | 1 232.95 € incl. VAT | 123.30 €/kW | In stock | 7h ago | Visit shop |
Specifications
Pros and cons
Models 4-15 kW achieve a maximum efficiency of 98.3%, while units 17-25 kW achieve 98.4% (according to official GoodWe datasheets). This places the series in the top quarter of three-phase string inverters, which, under Polish conditions (many hours of low sunlight), directly translates into higher annual production compared to models with efficiencies of 97.5-98.0%.
The SDT G2 allows for DC side over-sizing up to 150% of the nominal AC power, with a 110% AC overload. This allows designers to select modules based on actual roof conditions (small surface area, unfavorable orientation) without the need to purchase a larger inverter - a key advantage for typical pitched roofs in Poland.
Two independent MPPT controllers cover a range of 180-850 V DC (up to 1000 V), allowing for flexible string length selection with modules from different manufacturers and in various configurations. Independent maximum power point tracking reduces losses under partial shading or with different orientations.
The built-in AFCI (Arc-Fault Circuit Interruption) feature enhances fire safety for the installation - a requirement increasingly demanded by insurance companies and some commercial property managers. The IP65 enclosure provides complete protection against dust and rain when installed outdoors.
GoodWe is listed on BNEF's Tier 1 "Bankable" list, has its own R&D center, and a wide network of authorized service providers in Poland. The company has been operating since 2010, which reduces the risk of lacking after-sales support - a crucial factor given the 20-25-year lifespan of solar installations.
The standard manufacturer's warranty for SDT G2 inverters is 5 years. Extending this to 10 years is possible only through the GoodWe PLUS+ program (certified installer) and involves additional costs and the requirement to register on the SEMS portal. In comparison, SMA and Fronius in this segment offer a 5-year warranty with clear extension paths that are not dependent on a partner program.
This series does not offer a version with 3 or more MPPT (Maximum Power Point Tracking) systems. For roof installations with 3 or more orientations (e.g., a multi-pitched L-shaped roof), it is necessary to use power optimizers or a solution from a competitor (e.g., Huawei SUN2000 5-20KTL-M2 with 2 MPPT, but with finer string granularity), which increases the cost or complicates the project.
Alternatives
About the SDT G2 series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.