GoodWe GW40K-ET-1040kW three-phase hybrid inverter for C&I storage, 3 MPPT

Overview

The GW40K-ET-10 is a 40kW three-phase hybrid inverter from GoodWe's ET50 series for commercial and industrial storage. Three MPP trackers (42/32/42A, two strings each) accept up to 60kW of PV, and the 100A battery input charges and discharges at up to 44kW within 200–800V. With the STS200-80-10 cabinet it can run critical loads off-grid at 44kVA, with 48kVA for 60 seconds and 60kVA for 10 seconds. GoodWe recommends grid and backup breakers of at least 80A.

• 40kW and 50kW, 380/400V three-phase
• Battery 200–800V, 100A continuous, up to 55kW
• 3 or 4 MPPT, up to 42A per tracker
• Off-grid backup with STS200-80-10 transfer cabinet
• Up to 10 inverters in parallel with SEC3000C
• IP66, smart fan cooling, Type II SPD on DC and AC

How it works

The ET50 series brings GoodWe's hybrid concept to commercial and industrial sites. One unit combines three or four MPP trackers, a 100A high-voltage battery input (200–800V) and a 40 or 50kW grid connection, and its energy management covers self-consumption, backup, time-of-use, delayed charging under export limits, demand control (peak shaving) and off-grid operation. Charging and discharging reach 44kW on the GW40K-ET-10 and 55kW on the GW50K-ET-10.

Backup and off-grid operation are provided together with the GoodWe STS200-80-10 static transfer switch cabinet, which the manual lists as mandatory for the off-grid function. Off-grid, the GW50K-ET-10 sustains 55kVA, 60kVA for 60 seconds and 75kVA for 10 seconds. GoodWe limits the total motor load per inverter to 25kW and asks for a VFD on single three-phase motors of 8kW or more.

Key features

The trackers take 42A and 32A alternately (55A and 42A short-circuit) with two strings each, so modern high-current modules can be connected directly. The MPPT range is 165–850V at a maximum of 1000V. Maximum efficiency is 98.1%, European efficiency 97.5% and battery-to-AC efficiency 97.7%. Type II surge protection is fitted on both sides, with Type I+II DC protection and AFCI as options.

Installation and compatibility

Approved GoodWe batteries are the Lynx C cabinets LX C101-10 to LX C156-10 (BMS version 25600 or later), the BAT-I-G10 series from 25.6 to 56.3kWh and the BAT-AC-G10 series of 92.1 to 112.6kWh. With LX C101-10 or LX C120-10 the GW50K-ET-10 cannot reach full power. CEI 0-21 and CEI 0-16 certificates cover the series with Lynx C and BAT-AC batteries.

A GM330 meter is supplied for standalone operation, with CTs sourced from GoodWe or locally. Up to ten inverters can be paralleled through the SEC3000C smart energy controller, each fitted with a WiFi/LAN Kit-20. GoodWe recommends grid and backup breakers of at least 80A (GW40K-ET-10) or 100A (GW50K-ET-10) and, where required, a type A RCD of 500mA on the grid side.

Monitoring and settings

Set-up is done locally with the SolarGo app and remote monitoring runs on SEMS+. Portal communication uses RS485, Wi-Fi, LAN and Bluetooth, with 4G as an option; the BMS link is CAN and the meter link RS485. In parallel systems the SEC3000C embedded web interface is used for commissioning, and GoodWe publishes a third-party EMS Modbus protocol for integration.

Questions and answers