GoodWe GW20K-ET20kW three-phase high-voltage hybrid inverter, 2 MPPT

Overview

The GW20K-ET is the 20kW model of GoodWe's ET 15–30kW three-phase hybrid series. It has two 30A MPP trackers with two strings each and accepts up to 30kW of PV, while a single 50A battery input in the 200–800V range charges and discharges at up to 20kW. Off-grid, the backup port holds 20kVA, 24kVA for 60 seconds and 32kVA for 3 seconds. GoodWe documents the series in both residential and commercial manuals, and parallel units can be added later.

• 20, 25 and 29.9kW three-phase models in the EMEA range
• Battery 200–800V, 50A per input, up to 30kW
• Two or three 30A MPPT, two strings each
• Up to 150% PV input, 1000V max.
• Backup under 10ms with short-term overload
• Up to 4 inverters in parallel, IP66

How it works

The ET 15–30kW series is GoodWe's larger three-phase hybrid platform for 380/400V grids. One inverter manages the PV array, a high-voltage battery and the grid connection, giving priority to self-consumption and storing surplus energy. The GW20K-ET has one battery input, while the GW25K-ET and GW29.9K-ET have two independent 50A inputs, so two battery stacks can be connected and charged at up to 25 or 30kW.

When the grid fails the BACK-UP port switches over in under 10ms and keeps supplying three-phase loads at the rated power. A short-term overload helps start motors and pumps: the GW20K-ET reaches 24kVA for 60 seconds and 32kVA for 3 seconds. Unbalanced loads are allowed up to 6.7kW, 8.3kW or 10kW per phase depending on the model.

Key features

Each MPP tracker accepts two strings and 30A (38A short-circuit), which suits high-current modules, and the array can be oversized to 150% of the rated output at up to 1000V. Operating modes cover self-consumption, backup, time-of-use, delayed charging for export limits, demand control and off-grid. Protection includes string current monitoring, a DC switch, Type II DC and Type III AC surge arresters, with AFCI as an option.

Installation and compatibility

A GM3000 smart meter with fixed 120A/40mA CTs is supplied with the inverter; a GM330 with separate CTs is the alternative for larger connections. Up to four inverters with the same AC voltage can be paralleled. Recommended breakers range from 40A to 63A on the grid side, depending on model and backup use. The unit is wall-mounted, weighs 48–54kg and is cooled by smart fans.

GoodWe lists Lynx Home F and F G2, Lynx D, Lynx D G2, the Lynx C 60kWh cabinet and BAT-AC series batteries, plus third-party models such as BYD Battery-Box Premium HVS and HVM, each with minimum firmware. A CEI 0-21 certificate covers the series with Lynx F, Lynx F G2, Lynx C, Lynx D, BYD HVM, Pylontech Force H1/H2 and BAT-AC batteries; CEI 0-16 is certified too.

Monitoring and settings

Local set-up runs through the SolarGo app over Bluetooth, and remote monitoring through the SEMS+ portal over Wi-Fi or LAN. The inverter talks to the battery BMS over RS485 or CAN and to the meter over RS485. In parallel systems the master unit is fitted with an Ezlink3000 stick, and GoodWe publishes a separate instruction for parallel system composition.

Questions and answers