The SOFAR 250-350KTLX0 series from Sofar Solar are three-phase grid-tie inverters designed for large commercial, industrial, and PV farm applications where stable operation and rapid diagnostics are crucial. A key feature is the high-current DC input, which enables seamless integration with modern high-power modules without requiring artificial string configuration limitations. Another major advantage is the 8 independent MPPT channels (depending on the variant), facilitating the design of fields with varying orientations and tilts and improving energy yield during partial shading. High European efficiency remains a key characteristic, translating to fewer losses in typical operating conditions and higher annual energy production. For servicing, I-V curve scanning is available, helping to quickly identify issues on the module and string levels. The enclosure, designed for outdoor operation (IP66 and C5 corrosion resistance), enhances reliability in challenging environments. Monitoring is performed via C&I standard communication systems (e.g., RS485/PLC), simplifying integration with monitoring systems.
Ranking
Specifications
Pros and cons
The datasheet-confirmed peak efficiency of 99.05% and European efficiency of 98.8% places this series among the top performers in the utility-scale string inverter segment. For reference, the direct competitor Sungrow SG250HX achieves an identical European efficiency of 98.8%, indicating technological parity across the full rated power range of 250-350 kW.
Each of the 8 MPPT channels accepts up to 60 A of DC input current, enabling unconstrained stringing of high-power modules such as the Longi Hi-MO 9 and Jinko Tiger Neo 700. With 32 DC inputs (4 strings per MPPT), system designers can eliminate string combiner boxes in typical multi-row array configurations, reducing overall BoS CAPEX.
Support for DC voltages up to 1500 V allows longer string runs and greater separation between module rows and the inverter enclosure, reducing resistive losses on the DC side by an estimated 0.3-0.5 percentage points compared to 1000 V systems. This voltage class is a mandatory standard for PV plants exceeding 1 MWp.
The IP66 protection rating combined with corrosion class C5 per ISO 12944 qualifies the inverter for deployment in marine, industrial, and high-humidity environments without the need for an additional external enclosure. Many direct competitors in this power class are rated only to C3 or C4.
The integrated I-V curve scanning function enables detection of module degradation, partial shading, and bypass diode failures directly from the inverter, eliminating the need for on-site service visits with a standalone tester. Nighttime power consumption below 3 W minimizes passive standby losses.
The direct competitor Sungrow SG250HX offers 12 independent MPPT channels (24 DC inputs) at the same rated power of 250 kW, whereas the SOFAR 250KTLX0 provides 8 MPPT channels (32 DC inputs). In installations with multiple roof orientations or significant point shading, the lower MPPT channel count may limit yield optimization and increase mismatch losses between string groups.
Alternatives
About the SOFAR 250-350KTLX0 series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.