Fronius Argeno 125 AFCI125kW three-phase commercial string inverter with AFCI

Overview

The Argeno 125 AFCI (item 4,210,471) is the 125kVA Fronius Argeno with integrated arc fault detection, classified F-I-AFPE-2-4-5 to IEC 63027. Electrically it matches the standard Argeno 125: ten MPP trackers with two string inputs each, 30A and 15.5kWp per tracker, up to 250kWp in total, 99.1% peak efficiency and type 1+2 surge protection on both sides. It is the variant for plants where arc-fault protection is required; Fronius notes that optimisers or other active module electronics can impair arc detection.

• 125kVA output, ten MPP trackers with two inputs each
• Up to 99.1% peak and 98.7% European efficiency
• Replaceable type 1+2 DC and AC surge protection
• Aluminium or copper AC cables, 50–240mm²
• IP66, -25…+60°C, wall-bracket mounting
• Optional variant with integrated arc fault detection

How it works

Argeno is Fronius' large commercial string inverter. It feeds up to 125kVA into 400/230V or 380/220V three-phase grids, with 125kW nominal at 400V and 120kW at 380V. Ten independent MPP trackers, each with two string inputs, allow many roof sections or rows to be combined in one unit. Fronius uses silicon-carbide semiconductors and specifies 99.1% maximum and 98.7% European efficiency.

Key features

Each tracker accepts 30A and 15.5kWp, and each string 20A, with a 200–1,100V input range and 550–850V at full power. The inverter takes up to 250kWp in total. DC and AC surge protection devices of type 1+2 are integrated and replaceable, and an RCMU, insulation monitoring and DC disconnectors are built in. A variant with arc fault detection (item 4,210,471) is classified F-I-AFPE-2-4-5 to IEC 63027.

Installation and compatibility

The 755×1,070×330mm unit is mounted on its wall bracket, vertically or horizontally, but never with the connections facing upwards. AC terminals take aluminium or copper conductors of 50–240mm² with M10 cable lugs; single-core glands are standard, with multi-core and AC Daisy Chain options for linking two units. The upstream breaker may be rated up to 500A. Argeno is an EMC class A device, intended for sites at least 30m from sensitive radio services.

Monitoring and settings

Communication is wired: two daisy-chain Ethernet ports carry Solar.web and Modbus TCP SunSpec, and a separate static-IP port is used for commissioning through the built-in web interface. A wired shutdown input (INV OFF) and an error relay are provided. Its own feed-in limit requires a Fronius Smart Meter IP. In larger systems it can run as a secondary device under a GEN24, Verto or Tauro primary inverter, for up to 20 inverters and 300kW; above that, Fronius recommends a plant controller.

Questions and answers