The SOFAR 3.3-12KTLX-G3 series are three-phase grid-tie inverters designed for stable operation in residential and small to medium-sized commercial installations. These units feature two independent MPPT trackers, which facilitate high yields even when modules are distributed across different roof sections or partially shaded-each string string is optimized independently, rather than dragging down the entire installation.
In practice, high European efficiency is also important, meaning real efficiency calculated under typical operating conditions in Europe-leading to lower annual energy losses. The series supports string-level monitoring, remote firmware updates, and convenient diagnostics via an app and communication (e.g., RS485, Bluetooth; optionally WiFi/Ethernet-depending on configuration).
These are not hybrid inverters, so they are not designed for direct integration with energy storage systems. However, you benefit from a comprehensive suite of safety features (including type II SPDs on both DC and AC sides) and the typical, long warranty for this class of equipment.
Ranking
Price offers
| Shop | Country | Price | Per kW | Stock | Offer updated | Link to shop |
|---|---|---|---|---|---|---|
| Sklep Soltech | Poland | 2 283.04 zł net | 285.38 zł/kW | Not stated | 20h ago | Visit shop |
| www.fotovoltaika-eshop.sk | Slovakia | 944.04 € incl. VAT | 118 €/kW | In stock | 21h ago | Visit shop |
| aurinkosahkotukku.fi | Finland | 1 290 € incl. VAT | 161.25 €/kW | In stock | 23h ago | Visit shop |
| energiatuote.fi | Finland | 1 190 € incl. VAT | - | In stock | 9h ago | Visit shop |
Specifications
Pros and cons
A peak efficiency of 98.5% and a European efficiency of 98.0% place this series on par with higher-priced premium brands such as SMA and Fronius. EU efficiency is a more accurate predictor of real-world annual losses in Central European climates than peak efficiency alone.
Natural convection cooling eliminates moving parts susceptible to wear, resulting in silent operation (0 dB mechanical noise) and superior long-term reliability. This is a key advantage over fan-cooled models, which may require fan replacement after several years of service.
The wide MPPT input voltage range (140-1000 V, max DC 1100 V) allows flexible string configuration. Independent operation of two MPPT trackers eliminates cross-string drag in systems with mixed orientations or partial shading - a direct advantage over single-tracker inverters in this price class.
The IP65-rated enclosure enables outdoor installation without additional weatherproofing. Integrated Type II surge protection devices (SPD) on both the DC and AC sides deliver a complete protection package that some competitors in this price segment offer only as an option or only on one side.
The standard warranty is 5 years; however, through authorized distributors in Poland (including Corab) the unit ships with a 10-year warranty included in the price, and up to 12 years is available via sofar-sklep.pl - all at approximately 10-15% below SMA/Fronius pricing for comparable power output, representing genuine added value. This is complemented by string-level monitoring and over-the-air firmware update capability.
The KTLX-G3 series are purely grid-tie inverters with no native battery storage integration. In the 2025 market, where an increasing number of prosumers are considering retrofitting battery storage, this series forecloses a straightforward upgrade path - requiring either a full inverter replacement or the addition of an external EMS device.
Alternatives
About the SOFAR 3.3-12KTLX-G3 series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.