FoxESS T20-G3 20kW three-phase inverter20kW three-phase string inverter, 2 MPPT

Overview

The T20-G3 delivers 20kW and up to 22kVA into a three-phase grid. Its two MPP trackers each accept two strings and 28A, for up to 30kW of DC input at 1100V maximum, with full output between 370V and 850V per tracker. Fan cooling, 20kg weight and the same compact 370×480×183.5mm IP65 housing as the smaller models make wall mounting simple. FoxESS recommends a 63A AC circuit breaker. It suits commercial roofs, workshops and agricultural buildings with three-phase supply.

• 3–25kW three-phase, 2 independent MPPT
• 1100V max input, MPPT 140–1000V
• 98.6% max and 97.8% European efficiency
• PV oversizing to 150% of rated power
• Type II DC/AC surge protection built in
• VDE-AR-N 4105, EN 50549-1, C10/11 certified

How it works

The T series (G3) converts PV power to a three-phase 220/380V, 230/400V or 240/415V supply through two independent MPP trackers. Models up to 12kW take one string per tracker at up to 14A; from 15kW each tracker has two strings and 28A. The input accepts up to 1100V, with MPPT operation from 140V to 1000V and 600V rated, so long strings and east-west roofs on separate trackers are both possible.

Key features

Maximum DC input power is 150% of rated output on every model, from 4.5kW on the T3-G3 to 37.5kW on the T25-G3. Peak efficiency is 98.6%, European efficiency 97.8% and MPPT efficiency 99.8%. Models up to 12kW are convection-cooled and below 30dB; larger sizes use a fan. Type II surge protection on both DC and AC sides, insulation and residual current monitoring are standard, while AFCI and a DC switch are optional.

Installation and compatibility

All sizes share a 370×480×183.5mm IP65 housing of 17–21kg for wall mounting indoors or outdoors, with at least 300mm free at the sides and 500mm above, below and in front. FoxESS recommends a type A RCD where an external one is required. The manual also covers dual-string variants of the 8, 10 and 12kW models, marked (Dual).

The datasheet lists AS/NZS 4777.2, C10/11, EN 50549-1, PN-EN 50549-1, VDE-AR-N 4105, RD 1699, CEI 0-21, VDE V 0126-1-1 and UTE C 15-712-1 among its grid regulations. Certificates published by FoxESS include VDE-AR-N 4105, EN 50549-1 and NC RfG (DEKRA), C10/11 and EN 62109-1/-2 safety.

Monitoring and settings

An optional Wi-Fi or 4G module connects the inverter to the FoxCloud app and web portal; the LCD and touch key give local status. A meter on the grid side enables export limitation, and RS485, DRM and emergency-stop inputs are available for grid-operator and site control.

Questions and answers