--- title: "Sungrow SG20KTL-M Grid-tie Inverter: Specs & Datasheet | ComparePV" description: "Sungrow SG20KTL-M 20 kW grid-tie inverter. Specs: 98.3% European efficiency, 2 MPPT, 1100 V max DC input, 24.0 kg." source: "https://comparepv.com/inverter/sungrow-sg20ktl-m" updated: 2026-01-16 --- # Sungrow SG20KTL-M ## Identity - **Manufacturer:** Sungrow - **Model:** SG20KTL-M - **Series:** SG15KTL-M/SG20KTL-M - **Rated AC power:** 20 kW - **Type:** Grid-tie - **Phases:** Three-phase ## How it compares Compared against 227 inverters from 12 to 30 kW. Ranks are within that class. | Measure | This inverter | Class median | Standing | Rank in class | | --- | --- | --- | --- | --- | | European efficiency | 98.3% | 98.0% | Strong - top 16% | 22 | | MPPT trackers | 2 | 2 | Typical | 53 | | Max DC input voltage | 1100 V | 1000 V | Strong - top 21% | 1 | | Weight per kW | 1.2 | 1.6 | Strong - top 24% | 53 | | Warranty | - | 5 yrs | | | ## Specification ### AC output - **Rated AC power:** 20 kW - **Max apparent power:** 22.00 kVA - **Phases:** Three-phase - **Nominal AC voltage:** 400 V - **Max AC current:** 31.9 A - **Grid frequency:** 50 Hz - **Power factor:** 0.8 leading – 0.8 lagging - **Harmonic distortion (THD):** 3.0 % ### PV input - **Max DC voltage:** 1100 V - **MPPT voltage range:** 200 to 1000 V - **Start-up voltage:** 250 V - **MPPT trackers:** 2 - **Max input current per MPPT:** 22.0 A - **Max short-circuit current per MPPT:** 30.0 A ### Efficiency - **European efficiency:** 98.3 % - **Max efficiency:** 98.6 % ### Physical - **Dimensions:** 485 × 370 × 210 mm - **Weight:** 24.0 kg - **Enclosure:** IP65 - **Cooling:** forced-air - **Operating temperature:** -25 to 60 °C - **Max humidity:** 100 % - **Max altitude:** 4000 m ### Connectivity and protection - **Interfaces:** Bluetooth, Display - **Protocols:** Bluetooth (App), RS485 (optional), WiFi (optional), Ethernet (optional) - **Protection:** DC switch, Surge protection ### Warranty and certificates - **Certifications:** EN 62109-1, EN 62109-2, EN 61000-3-11, EN 61000-3-12, IEC 61727, IEC 62116, VDE0126-1-1/4105, AS 4777.2, IEC 60068, IEC 61683, EN 50530, CEI 0-21, NB/T32004-2013, UNE 206007-1, G59/3, UTE C15-712-1 ### Pros - **98.3% European Efficiency Rating** - According to the official Sungrow datasheet, the European efficiency is 98.3%, with a peak efficiency of 98.6%. For three-phase string inverters in the 15-20 kW class, this places the series among the top performers in the segment - the successor SG15RT reaches a slightly lower maximum of 98.1%. In practice, this translates to measurably higher annual energy yield in temperate climates. - **IP66 Ingress Protection + C5 Anti-Corrosion Rating** - The enclosure meets IP66 (fully dust-tight and protected against powerful water jets) and corrosion category C5 per ISO 12944, enabling installation in aggressive industrial and marine environments. The die-cast high-impact aluminum housing provides a clear advantage over competing models in this power class that offer only IP65. - **1.1× DC Overload Capability (+10% Yield)** - A permissible DC oversizing ratio of 1.1 allows approximately 10% more PV capacity to be connected without compromising inverter safety. In practice, this flattens the generation curve and increases yield during peak-irradiance hours, making it particularly beneficial in typical commercial PV installations. - **Built-In PID Recovery Function** - The proprietary PID (Potential Induced Degradation) recovery function operates overnight, reversing cell degradation caused by high string voltages. This is especially critical in commercial installations operating in the 600-1000 V DC range, where PID can reduce output power by 5-30% over several years. - **Tier-1 Bankable Manufacturer - Sungrow Since 1997** - Sungrow has maintained a continuous Tier-1 BNEF listing as one of the world's largest inverter manufacturers, holding approximately 25% global market share in 2024. Bankable status simplifies project financing with financial institutions and investment banks, which is a key requirement in the commercial PV segment. ### Cons - **Discontinued Series - Superseded by the RT Line** - The SG15KTL-M/SG20KTL-M line has been replaced by the current-generation SG15/17/20RT series, which is available through European distribution channels. This means active firmware development has ceased, sourcing original spare parts is becoming increasingly difficult, and there is a risk of limited technical support beyond the warranty period for installations commissioned after 2023. - **Reduced Warranty Coverage in Coastal Zones** - Per Sungrow's official warranty terms, installations located within 500 m of the sea forfeit the standard 10-year warranty protection - coverage is reduced to 2 years unless an extended warranty has been purchased separately. This is a significant limitation for port facilities, coastal manufacturing plants, and ground-mount systems near the shoreline. ## About this series The Sungrow SG15KTL-M/SG20KTL-M series are three-phase grid-tie inverters designed for commercial installations and larger domestic systems, where stable operation and flexible string design are key. Their strength lies in **two independent MPPTs**, which allow for optimised energy yield under partial shading and safely connect strings with different orientations or tilts without dragging down the entire system. In practice, this means predictable energy production even under more challenging conditions, and the high **European efficiency** translates to realistic, year-round yields, not just on paper. Furthermore, the **active, temperature-controlled cooling** helps maintain performance under load. Monitoring and service are available via RS485 communication and optional **Wi-Fi or Ethernet** modules with remote supervision features. The series offers comprehensive protection (including surge protection) and meets grid connection requirements, and the standard **10-year warranty** facilitates investment planning. This is an excellent choice for businesses, farms, and commercial premises. ## Questions ### What types of installations is the Sungrow SG15KTL-M/SG20KTL-M series suited for? The SG15KTL-M/SG20KTL-M series comprises three-phase grid-tied inverters rated at 15 kW and 20 kW, designed primarily for commercial facilities, service buildings, agricultural operations, and larger prosumer installations. The transformerless design and IP65 ingress protection rating allow installation both indoors and outdoors. This equipment is not intended for typical residential systems in the 5-10 kW range. ### What advantage do the 2 independent MPPTs in the SG15KTL-M/SG20KTL-M inverter provide, and when does it matter? Two independent MPPT trackers allow strings of panels with different orientations (e.g., south- and east-facing) or tilt angles to be connected without mutually degrading each other's performance. In practice, this is critical wherever part of a roof or ground-mount array is partially shaded - one string does not pull down the other, resulting in noticeably lower energy losses compared to a single-MPPT inverter. ### What is the efficiency of the Sungrow SG20KTL-M inverter, and does it affect annual energy yield? The maximum efficiency is 98.6%, while the European efficiency - a more meaningful metric for the Polish climate - reaches 98.3%. This is among the highest figures in this power class. For a 20 kW system, the difference between an inverter with 97% efficiency and one at 98.3% amounts to several hundred kilowatt-hours per year, which translates into a tangible cost saving over the full operational lifetime of the installation at current energy prices. ### How does the cooling system in the SG15KTL-M/SG20KTL-M series work, and is the inverter noisy in operation? The series uses active forced-air cooling with temperature-controlled fan management. The fan engages only when the inverter actually heats up, minimizing both acoustic noise and mechanical wear. The operating temperature range spans from -25 °C to 60 °C; however, above 45 °C the output power is automatically derated to protect the electronics. Under typical Polish climatic conditions, thermal throttling due to overheating in summer is uncommon. ### How can the Sungrow SG15KTL-M/SG20KTL-M inverter be monitored remotely? As standard, the inverter supports RS485 communication, which is sufficient for connection to local data loggers. Remote monitoring over the internet requires an optional Wi-Fi or Ethernet communication module. Once connected, the installation becomes visible in the iSolarCloud platform, where real-time generation data, historical yield records, and service alerts can be accessed via a web browser or mobile application. ### What warranty is provided for the Sungrow SG15KTL-M and SG20KTL-M inverters? The standard manufacturer's warranty is 10 years. Sungrow is a globally recognized Tier 1 manufacturer with service centers across Europe, including a repair facility near Munich serving the Polish market. The extended warranty period simplifies return-on-investment calculations and reduces the risk of unplanned replacement costs during the first decade of system operation. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/inverters/5f680f33b022f-f63a15e97f04.pdf) ## Alternatives | Inverter | Rated AC | Euro efficiency | MPPT | Weight | Difference | | --- | --- | --- | --- | --- | --- | | [Growatt MID 20KTL3-X](https://comparepv.com/inverter/growatt-mid-20ktl3-x) | 20 kW | 98.6% | 2 | 23.0 kg | 1.0 kg lighter | | [Fronius Verto 20.0](https://comparepv.com/inverter/fronius-international-fronius-verto-20-0) | 20 kW | 98.3% | 4 | 35.2 kg | +2 MPPT, 11.2 kg heavier | | [Huawei SUN2000-20KTL-M2](https://comparepv.com/inverter/huawei-sun2000-20ktl-m2) | 20 kW | 98.3% | 2 | 25.0 kg | 1.0 kg heavier | | [Huawei SUN2000-20KTL-M0](https://comparepv.com/inverter/huawei-sun2000-20ktl-m0) | 20 kW | 98.3% | 2 | 25.0 kg | 1.0 kg heavier | | [Sungrow SG20T-P2-CN](https://comparepv.com/inverter/sungrow-sg20t-p2-cn) | 20 kW | 98.3% | 2 | 19.0 kg | 5.0 kg lighter | | [Sungrow SG20RT-20](https://comparepv.com/inverter/sungrow-sg20rt-20) | 20 kW | 98.2% | 2 | 20.0 kg | 4.0 kg lighter | | [SOFAR 20KTLX-G3](https://comparepv.com/inverter/sofar-solar-sofar-20ktlx-g3) | 20 kW | 98.2% | 2 | 22.0 kg | 2.0 kg lighter | | [SOFAR 20KTLX2-G3P](https://comparepv.com/inverter/sofar-solar-sofar-20ktlx2-g3p) | 20 kW | 98.1% | 2 | 20.5 kg | 3.5 kg lighter | --- Source: https://comparepv.com/inverter/sungrow-sg20ktl-m