FoxESS solar kit 21.24kWp – T17-G3 17kW three-phase string inverter21.24kWp on-grid kit with 17kW three-phase inverter

Overview

21.24kWp of PV with the FoxESS T17-G3, a 17kW three-phase string inverter for shops, offices and farm buildings. Each of the two MPPTs accepts two strings at up to 28A, within 25.5kW of maximum PV input power, and the inverter delivers up to 18.7kVA. It is fan-cooled, rated IP65 and listed by FoxESS for CEI 0-21, EN 50549-1 and VDE-AR-N 4105.

• FoxESS T6-G3, T12-G3 or T17-G3 string inverter
• Two MPPTs, 140–1000V operating range, 140V start-up
• 98.6% maximum and 97.8% European efficiency
• IP65, -25…+60°C, Type II DC/AC surge protection
• CEI 0-21, EN 50549-1 and VDE-AR-N 4105 listed
• WiFi or 4G monitoring through FoxCloud

What's in the kit

• 1 × FoxESS T17-G3
• null × PV modules, 21.24kWp in total

System overview

These kits combine a FoxESS T Series (G3) three-phase string inverter with a PV array sized above the inverter's AC rating and within FoxESS' maximum input power. Energy is used directly by the building and the surplus is exported, or limited with a meter. There is no battery input. The residential 7.67kWp kit also includes DC and AC protection boxes; the 14.16kWp and 21.24kWp kits target small commercial roofs.

Inverter data

All T-G3 models accept up to 1100V DC, start at 140V and track between 140 and 1000V on two independent MPPTs. The T6-G3 and T12-G3 take one string per MPPT at 14A; the T17-G3 takes two strings per MPPT at 28A. Maximum PV input power is 9kW, 18kW and 25.5kW respectively. FoxESS quotes 98.6% maximum efficiency, 97.8% European efficiency and 99.8% MPPT efficiency for the whole range.

Protection and compliance

Insulation monitoring, residual current monitoring, DC reverse polarity, anti-islanding and AC short-circuit, overcurrent and overvoltage protection are built in, with Type II surge protection on DC and AC. The DC switch and AFCI are optional. FoxESS lists CEI 0-21, EN 50549-1, VDE-AR-N 4105, C10/11, RD 1699 and other grid regulations, plus EN 62109-1/2 for safety.

Installation and monitoring

The enclosure measures 370×480×183.5mm, is rated IP65 and weighs 17kg (T6, T12) or 20kg (T17). Models up to 12kW are cooled by natural convection and stay below 30dB; the T17-G3 uses a fan. Monitoring uses a WiFi or optional 4G module with FoxCloud, and the RS485, meter, DRM and emergency-stop ports allow export control. The installer adds mounting, cabling, protections where not supplied, and the grid connection paperwork.

Questions and answers