The SOFAR 255KTL-HV series are three-phase grid-tie inverters designed for large ground-mount and industrial installations, where reliable operation, dependable service, and high energy production under real grid conditions are essential. This model stands out from the competition with 12 independent MPPTs, simplifying the design of long strings and enabling better utilization of modules with different orientations or partial shading without compromising energy yields.
In practice, high European efficiency is also crucial - meaning higher effectiveness under typical operating conditions, translating to more energy fed into the grid annually. The series features diagnostic support functions, such as IV curve scanning, and built-in DC and AC surge protection, enhancing installation safety.
Available for monitoring operation are solutions for communication and monitoring (e.g., via local network or wireless modules), and the design with enhanced environmental protection facilitates outdoor installation. This is the ideal choice for large commercial PV farms and bigger projects - where reliability and monitoring are key.
Ranking
Specifications
Pros and cons
The SOFAR 255KTL-HV features 12 independent MPPT trackers across 24 string inputs, compared to 10 MPPTs on its direct competitor, the Huawei SUN2000-250KTL-H3. This translates into superior energy harvest on arrays with mixed orientations, longer strings, and partial shading conditions - without the need for power optimizers.
A European efficiency of 98.70% combined with a peak efficiency of 99.02% (per the manufacturer's official datasheet) positions this inverter above the SMA Sunny Highpower PEAK3 (~98.5% CEC) and on par with the Huawei SUN2000-250KTL (≥99.0%). In practice, higher European efficiency means more energy delivered to the grid under typical European irradiance profiles.
An IP66 protection rating (dust-tight and water-jet proof) combined with corrosion category C5 (per EN ISO 12944) allows installation in coastal, industrial, and desert environments without additional external enclosures, reducing overall project BoS costs.
The built-in active PID recovery function protects modules against potential-induced degradation, extending their operational lifespan. Integrated I-V curve scanning supports on-site diagnostics without additional instrumentation, reducing the time required to identify underperforming strings during maintenance.
Built-in Type II surge protective devices (SPDs) on both the DC and AC sides eliminate the need for external surge arresters in combiner or distribution cabinets, simplifying project documentation and reducing electrical installation costs while maintaining compliance with IEC 61643.
The rated output of 255 kVA is guaranteed only up to 35°C; at 45°C it drops to 230 kVA, and at 50°C to 220 kVA - a reduction of approximately 14% relative to the nominal rating (per the official Krannich/SOFAR datasheet). For installations in Southern Europe and the Middle East, where ambient temperatures regularly exceed 40°C, actual annual energy yield may fall short of projections based on nameplate capacity.
Alternatives
About the SOFAR 255KTL-HV series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.