SOFAR 6,6KTLX-G3 WiFi & DC Switch Three-Phase On-Grid Inverter

It is a grid inverter, that is the equipment that takes the direct current produced by the panels and converts it into the alternating current used by the appliances in the house. What you do not consume on the spot goes into the grid, under the prosumer scheme. It has no battery and does not work during a power cut, but it is simple, quiet, without fans, and takes care of all the rest by itself.

With 6 kW of active power and 6.6 kVA of apparent power, it suits an installation of the order of 6-8 kWp on a three-phase connection, that is an ordinary house with an electric boiler, air conditioning or an electric car charged slowly. It has two independent MPPT trackers, so it can take two groups of panels laid out on different slopes or orientations, without one interfering with the other, and the very wide operating range, from 140 V, allows it to start early in the morning and to work until late in the evening, indicatively, depending on the location. The efficiency of 98.4% means that very little of the energy produced by the panels is lost in conversion, and at night it consumes only 1 W. It weighs 17 kg, is naturally cooled, so it makes no noise, and the IP65 enclosure and the -30...+60 degrees C range allow it to be mounted on an outside wall, including in the cold areas of the country.

Active power 6000 W, maximum apparent 6.6 kVA, three-phase, maximum output current 10 A, frequency 45-65 Hz, THDi below 3%. DC: maximum voltage 1100 V, nominal 650 V, start-up from 160 V, MPPT range 140-1000 V, 2 trackers, maximum input current 30 A, with support for DC oversizing. Maximum efficiency 98.4%, European 97.5%, night consumption 1 W, transformerless topology, natural cooling. IP65, 430 x 385 x 182 mm, 17.0 kg, -30...+60 degrees C; RS485, Bluetooth and WLAN communication, and this configuration includes the WiFi module for cloud monitoring and the integrated DC switch, according to the EU installation requirements.

Who it suits

Suitable for a house with a three-phase connection and 6-8 kWp of panels, which wants to lower its bill through self-consumption and the sale of the surplus, without a battery and without a backup function during an outage.

Terms explained

• On-grid inverter: An inverter that works only together with the grid: if the grid goes down, it stops too, for safety reasons for the electricians working on the line.
• DC switch: A switch fitted on the panel side, with which the installer completely cuts the direct current before any intervention; in the EU it is mandatory.
• THDi below 3%: A measure of the cleanliness of the current delivered into the grid; a small value means a current close to the ideal shape, which does not disturb the other appliances.

Technical specifications

Recommended applications

• Three-phase residential photovoltaic systems of 6-8 kWp
• Household prosumers with a three-phase connection
• Roofs with two distinct orientations (2 MPPT)
• Outdoor mounting in a cold climate, down to -30 degrees C

Technical details

Specifications confirmed from the manufacturer's datasheet

SOFAR 6.6KTLX-G3 is part of the three-phase string inverter series 3.3-12KTLX-G3, intended for residential and small commercial photovoltaic installations connected to the grid. The rated active power is 6000 W, with a maximum apparent power of 6.6 kVA (hence the commercial name), and the maximum output current is 10 A over a frequency range of 45-65 Hz, with THDi below 3%.

The DC side accepts a maximum voltage of 1100 V and starts from 160 V; the nominal input voltage is 650 V, and the very wide MPPT range, 140-1000 V, allows short strings and production from the first hours of the morning. The inverter has two independent MPPT trackers and a maximum DC input current of 30 A, with support for DC oversizing.

The maximum efficiency is 98.4%, and the European efficiency 97.5%. The night-time consumption is only 1 W. The topology is transformerless, and the cooling is natural, without fans.

The enclosure has IP65 protection, dimensions of 430 x 385 x 182 mm and a weight of 17.0 kg, with an operating range of -30...+60 degrees C, suitable also for outdoor mounting in the Romanian climate. Communication is done through RS485, Bluetooth and WLAN, and this product configuration includes the WiFi module for cloud monitoring and the integrated DC switch, according to the EU installation requirements.