The Sungrow SG3.0/3.6/4.0RS series are single-phase grid-connected (on-grid) inverters, designed for modern home installations and small commercial projects, where reliable operation and rapid diagnostics are essential. A key advantage is the 2x MPPT technology, enabling independent management of two PV strings - simplifying the design for different roof orientations (e.g., east-west) and improving energy yield when parts of the modules are periodically shaded. High European efficiency translates to significantly better energy production in typical weather conditions in Poland, not just in a laboratory setting. Safety is ensured, among other things, by integrated AC and DC protections and arc detection, minimizing the risk of failures and downtime. For daily operation, the series offers comprehensive monitoring - via Wi-Fi or Ethernet, with viewing in the app and access to the cloud platform, facilitating remote servicing. The equipment meets connection requirements (e.g., PN-EN 50549-1) and comes with a 10-year warranty.
Ranking
Specifications
Pros and cons
Sungrow topped the BloombergNEF Inverter Bankability Survey 2025 for the sixth consecutive year, achieving 100% recognition among respondents. This confirms the manufacturer's long-term financial stability and reduces service-related risk for investors and project finance institutions funding PV installations.
The 40-560 V MPPT voltage range is among the widest in the single-phase 3-4 kW inverter class, enabling operation with short strings (as few as 2 modules) and providing significant design flexibility for east-west configurations or irregularly shaped rooftops. Two independent MPPT trackers allow arrays on faces with different orientations or tilt angles to be managed without mutual yield suppression.
Arc-fault circuit interruption (AFCI) and Class II surge protection devices (SPD) on both the DC and AC sides are integrated into the unit at no additional cost. Several competitors in this power class - such as the Huawei SUN2000-L1 in its base configuration - offer AFCI as a paid option or make it market-dependent.
At 10 kg and with an IP65-rated enclosure measuring 150×410×270 mm, the inverter can be installed by a single technician without specialized lifting equipment. The IP65 rating permits outdoor installation - such as on a garage wall - under central European climatic conditions, with no additional weatherproofing required.
The built-in Potential Induced Degradation (PID) recovery function, remotely activated via the iSolarCloud app, protects PV modules without the need for additional hardware. This feature is particularly valuable for modules mounted on metal structures lacking equipotential bonding.
With a maximum DC input voltage of 600 V, the series requires shorter strings than premium-segment competitors (Fronius Primo GEN24 and SMA Sunny Boy 1.5 both support Vmax 1000 V). With popular 400-430 Wp modules, strings are limited to a maximum of 8-9 modules, which - in systems above 6 kWp - results in higher DC wiring costs due to the greater number of parallel strings required.
The EU efficiency of 97.0% is a solid figure; however, the Huawei SUN2000-3/4/5KTL-L1 is rated at 98.6% EU efficiency and the GoodWe DNS-G3 at 97.8%. The ~1.6 percentage-point gap relative to the segment leader translates to approximately 50-80 kWh/year of lost generation for a 4 kW system under Polish irradiation conditions (~1,000 kWh/kWp/year), amounting to roughly 500-800 kWh of foregone production over a 10-year warranty period.
Alternatives
SolarEdge EV Charging Single Phase Inverter SE4000H (aka H4000SE / SE4000H)
4 kW
99.0%
-
11.4 kg
+1.8 pp efficiency, 1.4 kg heavier
About the SG3.0/3.6/4.0RS series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.