Sofar Solar's SOFAR 1~4KTL2-G3 series are single-phase grid-tie inverters designed for small and medium PV installations where reliable operation, fast installation, and resistance to external conditions are key. What sets them apart is the DC oversizing capability, allowing the installation to better utilize weaker sunlight conditions without losing control over the inverter's operation. The enclosure features a protection class suitable for outdoor mounting, and refined protections enhance reliability in daily operation.
A major advantage is the 2 independent MPPTs in this power class - enabling efficient management of two strings of panels with different orientations (e.g., east-west) or partially shaded sections, genuinely improving energy yields. High European efficiency means better energy production under the typical, variable weather conditions in Poland, not just in ideal operating conditions.
Monitoring can be done via RS485, WiFi, or Ethernet modules, usually with a view in the application. This is a series for demanding residential and small commercial installations; it is not a hybrid inverter, so it is not intended for direct operation with energy storage.
Ranking
Specifications
Pros and cons
Having two independent maximum power point trackers in a single-phase inverter of this power class is a differentiator - most direct competitors (e.g., Growatt MIN 1-3KTL-X, older Goodwe series) offer only 1 MPPT in the sub-3 kW range. This enables efficient management of two roof faces with different orientations (e.g., east-west) or partially shaded strings without the need for power optimizers.
The allowable DC oversizing up to 140% (PV array power may be up to 1.4× the inverter's rated AC output) enables better harvest during low-irradiance conditions - typical of morning and evening hours in the Polish climate - without risk of permanent device overload. The manufacturer's datasheet (v2.2, 2023-11-30) confirms this parameter for the entire series.
A peak efficiency of 97.7% places this series in the top quartile among budget-class single-phase grid-tied inverters. The IP65 enclosure allows direct outdoor installation (wall or roof mounting), eliminating the need for an additional protective enclosure and simplifying system design.
The weight range of 6.0-7.3 kg (depending on the power variant) facilitates single-person installation on a facade or roof. For comparison, the Fronius Primo 3.0 weighs approximately 10.9 kg and the SMA Sunny Boy 3.0 approximately 10.5 kg. The lower mass reduces labor costs in volume installations.
The standard factory warranty is 10 years (120 months from purchase), with optional extension to 15 or 20 years. Sofar Solar maintains an office and training center in Poland, provides warranty documentation in Polish, and operates a dedicated European service hotline (sofarsolar.eu), reducing logistical risk in warranty claims.
In the KTL2-G3 series, the WiFi and Ethernet communication module is not included as standard - it is a separate accessory with an additional purchase and installation cost. The competing Huawei SUN2000-L1 (1-6 kW) bundles a WiFi dongle with every unit at list price, which lowers the total monitoring system cost in large-scale prosumer installations.
Alternatives
About the SOFAR 1~4KTL2-G3 series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.