--- title: "Sungrow SG4.0RS Grid-tie Inverter: Specs & Datasheet | ComparePV" description: "Sungrow SG4.0RS 4 kW grid-tie inverter. Specs: 97.2% European efficiency, 2 MPPT, 600 V max DC input, 10.0 kg." source: "https://comparepv.com/inverter/sungrow-sg4-0rs" updated: 2026-01-16 --- # Sungrow SG4.0RS ## Identity - **Manufacturer:** Sungrow - **Model:** SG4.0RS - **Series:** SG3.0/3.6/4.0RS - **Rated AC power:** 4 kW - **Type:** Grid-tie - **Phases:** Single-phase ## How it compares Compared against 362 inverters from 3 to 6 kW. Ranks are within that class. | Measure | This inverter | Class median | Standing | Rank in class | | --- | --- | --- | --- | --- | | European efficiency | 97.2% | 97.2% | Typical | 119 | | MPPT trackers | 2 | 2 | Typical | 13 | | Max DC input voltage | 600 V | 600 V | Typical | 94 | | Weight per kW | 2.5 | 3.3 | Typical | 96 | | Warranty | - | 5 yrs | | | ## Specification ### AC output - **Rated AC power:** 4 kW - **Max apparent power:** 4.00 kVA - **Phases:** Single-phase - **Nominal AC voltage:** 230 V - **Max AC current:** 18.2 A - **Grid frequency:** 50 Hz - **Power factor:** > 0.99 at rated power; adjustable 0.8 leading – 0.8 lagging - **Harmonic distortion (THD):** 3.0 % ### PV input - **Max DC input power:** 6.00 kW - **Max DC voltage:** 600 V - **MPPT voltage range:** 40 to 560 V - **Start-up voltage:** 50 V - **MPPT trackers:** 2 - **Max input current per MPPT:** 16.0 A - **Max short-circuit current per MPPT:** 20.0 A ### Efficiency - **European efficiency:** 97.2 % - **Max efficiency:** 97.9 % ### Physical - **Dimensions:** 270 × 410 × 150 mm - **Weight:** 10.0 kg - **Enclosure:** IP65 - **Cooling:** natural - **Operating temperature:** -25 to 60 °C - **Max humidity:** 100 % - **Max altitude:** 4000 m ### Connectivity and protection - **Interfaces:** Wi-Fi, Ethernet, Display - **Protocols:** Ethernet, WLAN, RS485, DI (Ripple control & DRM) - **Protection:** AFCI, DC switch, Surge protection ### Warranty and certificates - **Certifications:** IEC/EN 62109-1/2, IEC/EN 62116, IEC/EN 61727, IEC/EN 61000-6-2/3, EN 50549-1, AS 4777.2, ABNT NBR 16149, ABNT NBR 16150, UNE 217002:2020, NTS V2 TypeA, CEI 0-21:2020, VDE 0126-1-1/A1 (VFR-2019), UTE C15-712, C10/11, G98/G99 ### Pros - **#1 BNEF Bankability Ranking 2025** - 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. - **Wide MPPT Voltage Range: 40-560 V** - 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. - **AFCI and Class II SPD Included as Standard** - 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. - **Compact Form Factor and IP65: 10 kg, 150×410×270 mm** - 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. - **PID Recovery Function Included as Standard** - 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. ### Cons - **DC Vmax 600 V - Below the 1000 V Industry Standard** - 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. - **European Efficiency 97.0% - Not a Segment Leader** - 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. ## About this series 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**. ## Questions ### What is the maximum efficiency of the Sungrow SG3.0/3.6/4.0RS inverter, and does it translate into real-world energy savings? The SG3.0/3.6/4.0RS series achieves a maximum efficiency of up to 98.1%, with a weighted European efficiency of approximately 97.4%. In practice, this means that nearly all of the energy harvested from the PV modules is delivered to the grid or consumed on-site, with minimal conversion losses. In the Polish climate, where diffuse irradiance conditions are common, a high European efficiency figure is more indicative of real-world performance than a peak laboratory efficiency rating. ### What PV system size is the Sungrow SG4.0RS suitable for, and how many modules can be connected to it? The SG4.0RS accepts a maximum DC input of 6 kWp, which corresponds to approximately 13-15 modules when using typical 400-450 W panels. The two independent MPPT inputs allow the array to be split into two strings - for example, one on an east-facing roof slope and one on a west-facing slope - without either string negatively affecting the other's output. The maximum DC input voltage is 600 V. ### Is the Sungrow SG3.0/3.6/4.0RS suitable for a rooftop installation with multiple orientations, such as an east-west configuration? Yes, the dual independent MPPT inputs in this series are designed precisely for such configurations. Each string operates at its own optimal maximum power point, ensuring that shading or different irradiance levels on one roof slope do not reduce the output of the other. The MPPT voltage range of 40-560 V provides significant design flexibility when configuring strings on roof planes with varying tilt angles and azimuths. ### What warranty is provided for the Sungrow SG3.0/3.6/4.0RS, and is Sungrow a reliable manufacturer? The SG3.0/3.6/4.0RS series comes with a standard manufacturer's warranty of 10 years. Sungrow is a Chinese manufacturer consistently ranked as a Tier 1 supplier by independent industry analysts, reflecting strong financial stability and mature manufacturing processes. The company has operated globally since 1997 and is among the largest inverter suppliers in the world, which ensures broad service network coverage and reliable availability of replacement parts. ### Can the Sungrow SG4.0RS be monitored via a smartphone, and how does remote diagnostics work? Yes, the series supports both Wi-Fi and Ethernet connectivity. Once connected to the local home network, generation data, consumption data, and any fault events are accessible through the iSolarCloud mobile application and the Sungrow cloud platform. Installers can remotely review operational parameters and push firmware updates without an on-site visit, significantly reducing service response times. ### Does the Sungrow SG3.0/3.6/4.0RS comply with Polish grid-connection requirements for the power distribution network? Yes, the series is compliant with standard PN-EN 50549-1, which governs the grid connection of micro-installations in Poland. The units feature integrated AC and DC protection, Type II surge protection on both the AC and DC sides, and Arc Fault Circuit Interrupter (AFCI) detection. An IP65 ingress protection rating permits outdoor installation, while an operating temperature range of -25 °C to +60 °C ensures reliable operation throughout Polish winters. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/inverters/ds-20220714-sg3-0-3-6-4-0rs-datasheet-v12-en-gl-977256053e13.pdf) ## Alternatives | Inverter | Rated AC | Euro efficiency | MPPT | Weight | Difference | | --- | --- | --- | --- | --- | --- | | [SolarEdge EV Charging Single Phase Inverter SE4000H (aka H4000SE / SE4000H)](https://comparepv.com/inverter/solaredge-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 | | [SolarEdge SE4000H (HD‑Wave, single phase)](https://comparepv.com/inverter/solaredge-solaredge-se4000h-hd-wave-single-phase) | 4 kW | 98.8% | | 9.0 kg | +1.6 pp efficiency, 1.0 kg lighter | | [Solis-3P4K-4G](https://comparepv.com/inverter/ginlong-solis-solis-3p4k-4g) | 4 kW | 97.8% | 2 | 17.3 kg | +0.6 pp efficiency, 7.3 kg heavier | | [Ginlong Solis S6-GR3P-4K02-NV-ND](https://comparepv.com/inverter/ginlong-solis-s6-gr3p-4k02-nv-nd) | 4 kW | 97.7% | 2 | 14.7 kg | +0.5 pp efficiency, 4.7 kg heavier | | [GoodWe GW4K-DT](https://comparepv.com/inverter/goodwe-gw4k-dt) | 4 kW | 97.6% | 2 | 15.0 kg | +0.4 pp efficiency, 5.0 kg heavier | | [Growatt MOD 4000TL3-X](https://comparepv.com/inverter/growatt-mod-4000tl3-x) | 4 kW | 97.5% | 2 | 12.5 kg | 2.5 kg heavier | | [Growatt MOD 4000TL3-X2 (Pro)](https://comparepv.com/inverter/growatt-mod-4000tl3-x2-pro) | 4 kW | 97.5% | 2 | 14.6 kg | 4.6 kg heavier | | [SOFAR 4.4KTLX-G3](https://comparepv.com/inverter/sofar-solar-sofar-4-4ktlx-g3) | 4 kW | 97.5% | 2 | 17.0 kg | 7.0 kg heavier | --- Source: https://comparepv.com/inverter/sungrow-sg4-0rs