--- title: "SOFAR 40KTLX-G4-LV Grid-tie Inverter: Specs & Datasheet | ComparePV" description: "SOFAR 40KTLX-G4-LV 40 kW grid-tie inverter. Specs: 98.0% European efficiency, 900 V max DC input, 75.0 kg." source: "https://comparepv.com/inverter/sofar-solar-sofar-40ktlx-g4-lv" updated: 2026-01-16 --- # SOFAR 40KTLX-G4-LV ## Identity - **Manufacturer:** Sofar Solar - **Model:** SOFAR 40KTLX-G4-LV - **Series:** SOFAR KTLX-G4-LV - **Rated AC power:** 40 kW - **Type:** Grid-tie - **Phases:** Three-phase ## How it compares Compared against 243 inverters from 30 to 100 kW. Ranks are within that class. | Measure | This inverter | Class median | Standing | Rank in class | | --- | --- | --- | --- | --- | | European efficiency | 98.0% | 98.2% | Typical | 99 | | MPPT trackers | - | 4 | | | | Max DC input voltage | 900 V | 1100 V | Weak - bottom 6% | 212 | | Weight per kW | 1.9 | 1.1 | Weak - bottom 13% | 197 | | Warranty | - | 5 yrs | | | ## Specification ### AC output - **Rated AC power:** 40 kW - **Max AC power:** 44.00 kW - **Max apparent power:** 44.00 kVA - **Phases:** Three-phase - **Nominal AC voltage:** 220 V - **Max AC current:** 115.5 A - **Grid frequency:** 50 Hz - **Power factor:** 0.8 leading – 0.8 lagging - **Harmonic distortion (THD):** 3.0 % ### PV input - **Max DC input power:** 60.00 kW - **Max DC voltage:** 900 V - **MPPT voltage range:** 180 to 800 V - **Start-up voltage:** 200 V - **Max input current per MPPT:** 40.0 A - **Max short-circuit current per MPPT:** 50.0 A ### Efficiency - **European efficiency:** 98.0 % - **Max efficiency:** 98.5 % ### Physical - **Dimensions:** 695 × 970 × 325 mm - **Weight:** 75.0 kg - **Enclosure:** IP66 - **Cooling:** forced-air - **Operating temperature:** -30 to 60 °C - **Max humidity:** 100 % - **Max altitude:** 4000 m ### Connectivity and protection - **Interfaces:** Wi-Fi, Bluetooth, Display - **Protocols:** RS485, USB, WiFi, Bluetooth (App) - **Protection:** AFCI, DC switch, Surge protection ### Warranty and certificates - **Certifications:** IEC/EN 61000-6-2/4, IEC 62116, IEC 61727, IEC/EN 62109-1/2, ABNT NBR 16149, ABNT NBR 16150 ### Pros - **Peak efficiency of 98.6% - C&I class** - The 40-75KTLX-G4-LV series achieves a peak efficiency of 98.6% with a European efficiency at a comparable level, placing it in the top quartile of the commercial segment - on par with the Sungrow SG50CX (98.7%) and Huawei SUN2000-50KTL (98.6%). Under Poland's variable irradiance conditions, this translates into measurably higher annual energy yield compared to inverters rated below 98%. - **6-8 independent MPPTs, DC/AC ratio ≥200%** - Series models feature 6 to 8 independent MPPT trackers and support a DC/AC ratio exceeding 200%, enabling flexible string design on complex multi-pitch roofs or sites with partial shading - a common challenge in C&I installations in Poland. - **20 A string current - ready for 700 W+ modules** - The 20 A per-string input accepts high-power bifacial modules in the 700-730 W class (e.g., JA Solar JAM72D42, Trina Vertex S+) without requiring external parallel connectors, simplifying installation and reducing BoS costs. - **AFCI protection + IP66/C5** - The built-in AFCI (arc-fault circuit interruption) function enhances fire safety in line with the requirements of a growing number of commercial property insurers. The IP66 ingress protection rating and C5 anti-corrosion category allow installation in coastal, agricultural, and light industrial environments without additional protective enclosures. - **Operating temperature range: -30 to +60 °C** - The rated operating range of -30 to +60 °C ensures reliable performance during harsh Polish winters as well as extreme heat events on dark industrial rooftops, where ambient temperature near the inverter can exceed +50 °C. ### Cons - **Limited service network in Poland** - Despite its standing as a recognized Tier-1/Tier-2 manufacturer in emerging markets, Sofar Solar does not maintain a Polish service network comparable to SMA (authorized service partners in every province) or Fronius. In the event of an inverter failure at a C&I site of 500 kW or larger, lead times for a field technician or replacement parts may be significantly longer than those offered by market leaders - a quantifiable financial risk for business customers operating under SLA agreements. ## About this series The SOFAR KTLX-G4-LV series are three-phase grid-connected (on-grid) inverters designed for large commercial and industrial installations, where reliable operation and easy scaling are key. The main advantage is **multi-channel MPPT** - the use of multiple independent trackers allows efficient management of several PV panels with different orientations and tilts, and minimizes losses due to partial shading or uneven soiling. In practice, this translates to more predictable energy production throughout the day. High **European efficiency** means better performance under typical operating conditions found in Poland - achieving significantly more yield from the same module power, especially with variable weather. The series offers **remote monitoring** with a built-in WiFi module, RS485 interface, and compatibility with monitoring systems (e.g., SCADA), simplifying diagnostics and maintenance. Additionally, it features robust protections (including surge protection) and compliance with connection requirements, along with a sturdy enclosure for outdoor use and warranty terms tailored for business applications. ## Questions ### How many MPPT trackers does the SOFAR KTLX-G4-LV inverter have, and why does it matter? The SOFAR KTLX-G4-LV series features between 6 and 8 independent MPPT trackers, depending on the model (40, 50, 60, or 75 kW). This allows multiple string arrays with different orientations or tilt angles to be connected and tracked independently. In practice, this translates to reduced losses under partial shading conditions or in installations where one array section faces east and another faces south. ### What is the maximum efficiency of the SOFAR KTLX-G4-LV inverter? The maximum efficiency of the SOFAR KTLX-G4-LV inverters is 98.6%. The high European efficiency rating translates to improved energy yield under Central European climate conditions, where operation at partial irradiance levels is commonplace. In a 60-75 kW system, a difference of even a few tenths of a percentage point in efficiency results in a measurable gain in kilowatt-hours over the course of a year. ### Does the SOFAR KTLX-G4-LV inverter support modules rated above 700 W? Yes, the KTLX-G4-LV series is designed with the latest high-power modules in mind. The maximum string current of 20 A allows seamless compatibility with 700 W and higher-rated panels. This means an installation can be configured with fewer strings, simplifying the DC wiring and reducing overall balance-of-system (BoS) installation costs. ### What monitoring and remote management capabilities does the SOFAR KTLX-G4-LV series offer? The inverters are equipped with a built-in Wi-Fi module for production monitoring via a mobile application, as well as an RS485 interface for integration with supervisory systems, including SCADA platforms. This enables commercial and industrial installations to be incorporated into comprehensive energy management systems, allowing faults to be detected and addressed remotely without requiring a service technician to be physically present on site. ### What is the warranty on the SOFAR KTLX-G4-LV inverters, and can it be extended? The standard manufacturer's warranty for Sofar Solar inverters is 10 years. As a product targeting commercial and industrial installations, the KTLX-G4-LV series comes with warranty terms aligned to business requirements. It is advisable to consult an authorized distributor regarding extended warranty options, which can be particularly important for projects financed through grants or investment loans. ### Is the SOFAR KTLX-G4-LV inverter suitable for outdoor installation and harsh environments? Yes, the KTLX-G4-LV series enclosure carries an IP66 protection rating and a C5 corrosion category, providing full resistance to dust and water jets as well as long-term durability in highly corrosive environments - such as coastal locations or industrial facilities. The inverters can be installed directly outdoors, which simplifies system design and shortens DC cable runs. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/inverters/1707116826509049360-8ac431e1cd7a.pdf) ## Alternatives | Inverter | Rated AC | Euro efficiency | MPPT | Weight | Difference | | --- | --- | --- | --- | --- | --- | | [Growatt MID 40KTL3-X](https://comparepv.com/inverter/growatt-mid-40ktl3-x) | 40 kW | 98.5% | | 30.5 kg | +0.5 pp efficiency, 44.5 kg lighter | | [Huawei SUN2000-40KTL-M3](https://comparepv.com/inverter/huawei-sun2000-40ktl-m3) | 40 kW | 98.4% | 4 | 43.0 kg | +0.4 pp efficiency, 32.0 kg lighter | | [Solis-40K](https://comparepv.com/inverter/ginlong-solis-solis-40k) | 40 kW | 98.4% | 4 | 61.0 kg | +0.4 pp efficiency, 14.0 kg lighter | | [Sungrow SG40CX-P2](https://comparepv.com/inverter/sungrow-sg40cx-p2) | 40 kW | 98.3% | 4 | 40.0 kg | 35.0 kg lighter | | [Sungrow SG40CX](https://comparepv.com/inverter/sungrow-sg40cx) | 40 kW | 98.3% | | 58.0 kg | 17.0 kg lighter | | [Ginlong Solis S5-GC40K](https://comparepv.com/inverter/ginlong-solis-s5-gc40k) | 40 kW | 98.3% | | 42.1 kg | 32.9 kg lighter | | [Deye SUN-40K-G-LV](https://comparepv.com/inverter/deye-sun-40k-g-lv) | 40 kW | 98.3% | 4 | 60.0 kg | 15.0 kg lighter | | [SOFAR 40KTLX-G3](https://comparepv.com/inverter/sofar-solar-sofar-40ktlx-g3) | 40 kW | 98.2% | | 37.0 kg | 38.0 kg lighter | --- Source: https://comparepv.com/inverter/sofar-solar-sofar-40ktlx-g4-lv