The GoodWe SS series are classic grid-tie inverters designed for home and small commercial installations, where stable operation, quiet running, and fast installation are key. The fanless passive-cooling structure minimizes noise and reduces the risk of mechanical failures, which is crucial when installed in garages or technical rooms. Depending on the variant, the series offers independent MPPT tracks, facilitating higher yields on panels with different tilts or partial shading by allowing the inverter to better adapt the module operating point to variable conditions. High European efficiency translates into significantly higher energy production in typical weather conditions in Poland, not just in ideal laboratory settings. A clear display and communication via USB and wireless modules monitor its operation, while online monitoring is handled through the SEMS platform. The SS series is not hybrid, so it does not directly work with energy storage systems; however, it meets popular certification requirements for grid-connected operation and is a sensible choice for simple, efficient PV installations.
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Specifications
Pros and cons
The fanless design eliminates the only moving mechanical parts in the inverter, reducing noise to practically 0 dB and removing the primary cause of failure in older, actively cooled units. This is particularly important when installing inside a building.
The GW4000-SS model received a "Double A" rating in an independent PHOTON test, placing GoodWe in the top 3 among single-phase inverters worldwide at the time of the results' publication. The GW4000-SS's European efficiency is >97.4%, which translates to a significantly higher annual energy production in Poland's variable weather conditions compared to devices with efficiency <96%.
GoodWe is listed on BNEF's Tier-1 Bankable Manufacturers list, is a publicly traded company (SZSE: 688390), and has been operating since 2010, which means that authorized service and warranty support are readily available in Poland. The standard 5-year warranty can be extended free of charge to 10 years upon registration through GoodWe PLUS+.
The MPPT input voltage range (125-550 V DC, max. 580 V DC in GW4000-SS) allows for flexible configuration of module strings and operation from a low starting voltage, without the need for precise selection of a string based on specific conditions.
Built-in USB communication and optional wireless modules (Wi-Fi/RS485) enable integration with the free SEMS Portal platform (mobile app + web panel), which is a standard requirement for most Polish prosumer installers.
The GoodWe SS Series is no longer listed on the manufacturer's current product page (en.goodwe.com/products, as of 2025/2026); the technical documentation dates from 2015, and the NS/DNS series (which is approximately 37% lighter, has a lower starting voltage of 80 V vs. 125 V, and includes integrated Wi-Fi) has replaced it. This may mean limited availability of spare parts and a shorter service pathway.
The GW3000-SS and GW4000-SS models feature a single MPPT (Maximum Power Point Tracking) system, while the successor (DNS Series) offers 2 independent MPPT tracks starting from 3 kW. With a roof that has two orientations or partial shading, a single MPPT track results in a forced compromise in the operating point of the entire string, leading to efficiency losses of 5-15% in unfavorable configurations.
The maximum efficiency of the GW3000-SS is 97.0%, while the GW4000-SS is 97.8%. In contrast, current single-phase inverters of this class (GoodWe XS: ~98.3%, SMA Sunny Boy 3.0: ~98.3%, Fronius Primo GEN24: ~98.0%) achieve approximately 0.5-1.3% higher efficiency. With an installation of 5 kWp in Poland (~1,000 kWh/kWp/year), this difference translates to approximately 25-65 kWh lower annual production.
Alternatives
About the SS Series series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.