The SOFAR 25-50KTLX-G3 series are three-phase grid-tie inverters designed for commercial and small industrial installations, where flexible string design and stable operation under varying conditions are essential. Depending on the variant, you receive up to 4 independent MPPTs, facilitating optimizing energy harvests from panels with different orientations, mismatched strings, or partial shading - each string independently tracks its own power point, rather than 'averaging' the performance of the entire array. High European efficiency translates to significantly better energy production in typical operating conditions in Poland, not just in ideal laboratory scenarios. Enhanced safety is also a key feature - SPD type II on both DC and AC sides, along with optional AFCI to help detect dangerous arc faults early. Standard features include a built-in WiFi module and communication (including RS485, optional Ethernet), enabling user-friendly monitoring in portal/app. This is an excellent choice for businesses, rooftop farms, and larger facilities seeking a 12-year warranty and compliance with grid requirements (e.g., NC RfG).
Ranking
Price offers
| Shop | Country | Price | Per kW | Stock | Offer updated | Link to shop |
|---|---|---|---|---|---|---|
| Sklep Soltech | Poland | 6 369.32 zł net | 193.01 zł/kW | Not stated | 22h ago | Visit shop |
Specifications
Pros and cons
The series features up to 4 independent MPPTs with a voltage range of 180-1000 V and 2 string inputs per tracker (up to 8 strings total on the 50 kW model). A DC overload capability of up to 150% allows oversizing the PV array without replacing the inverter, reducing LCOE in commercial rooftop designs with partial shading or multiple roof orientations.
The manufacturer's datasheet specifies a maximum efficiency of 98.80% and a European efficiency of 98.2-98.8% depending on the variant. This is a competitive result in the commercial 25-50 kW class - comparable to the Sungrow SG50CX (~98.7%) and higher than older platforms in this segment (~98.0-98.3%).
The manufacturer provides a 12-year warranty at no additional cost, while Sungrow offers 10 years as standard and Fronius 5-10 years. This 2+ year advantage translates into lower service risk during the first investment cycle and a more favorable CAPEX/TCO ratio for commercial investors.
Integrated Type II surge protection devices (SPDs) on both the DC and AC sides eliminate the need for external SPD purchases, typically saving 300-600 PLN per unit on a 50 kW installation. Optional AFCI enables early arc-fault detection - a feature of particular relevance where commercial property insurers impose specific requirements.
The series spans 9 power classes (25/30/33/36/40/45/50 kW) sharing a common software and communication platform (Wi-Fi + RS485 as standard). The integrated I-V curve scan function enables remote detection of string degradation and module-level faults without additional hardware.
The Ethernet module requires an additional purchase; only Wi-Fi and RS485 are included as standard. Competing commercial platforms such as the Huawei SUN2000-40/50KTL provide an Ethernet port out of the box, which matters when integrating with SCADA systems or managing multiple inverters within a single installation.
Wood Mackenzie H1 2025 places Sofar Solar in Grade A, but below the Top 5 (Huawei, Sungrow, SMA, Fronius, GoodWe). For projects involving project finance, some lending institutions require equipment exclusively from top-five-ranked manufacturers, which may limit the applicability of this series in larger transactions.
Alternatives
About the SOFAR 25-50KTLX-G3 series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.