GoodWe ESA GW5K-ETA-G205kW three-phase hybrid power module for the ESA storage system, 3 MPPT

Overview

The GW5K-ETA-G20 is the 5kW power module of GoodWe's three-phase ESA all-in-one system: a hybrid inverter that stacks directly on Lynx D G2 battery modules. Three 21A MPP trackers accept up to 10kW of PV, and the battery side charges at 5kW and discharges at 5.5kW. Off-grid it supplies 5.5kVA, or 10kVA for 10 seconds, and up to 2.5kW per phase. Its 63A internal bypass allows whole-home backup in smaller three-phase houses.

• Power modules from 5 to 30kW, hybrid (ETA) or AC-coupled (BTA)
• Battery modules of 5.12, 6, 8.32 and 9kWh, up to 12
• Blind-mate stacking: no cables between inverter and batteries
• Backup switch-over under 4ms, 63A or 80A bypass for whole-home backup
• Up to 200% PV oversizing on hybrid models
• Up to 10 power modules in parallel, IP66

How it works

ESA stands for an energy storage all-in-one: the inverter, called the power module, sits on top of a stack of Lynx D G2 battery modules and connects to them through blind-mate connectors, so no DC cabling is run between inverter and batteries. ETA models are hybrid inverters with three or four MPP trackers; BTA models are AC-coupled versions without PV inputs, intended for adding storage to an existing PV system.

The battery side works at 700–950V in three-phase systems. Modules of different capacities can be mixed, from a single 5.12kWh module up to twelve, or 5 to 108kWh. Each power module has a GRID port and a BACK-UP port; an internal bypass of 63A (5–20kW) or 80A (25–30kW) lets the BACK-UP port carry the whole house, switching to battery power in less than 4ms when the grid fails.

Key features

Hybrid models accept up to twice their rated power in PV, at 120–950V MPPT range and 1000V maximum, and charge the battery at up to 1C. Off-grid, the backup output can be overloaded for 10 seconds, for example to 20kVA on the 10kW model. Working modes include self-consumption, backup, time-of-use, delayed charging, peak shaving and off-grid. The battery modules integrate heating for charging from -18°C and an aerosol fire-extinguishing unit.

Installation and compatibility

A floor-standing system takes up to three groups and twelve modules; wall-mounted systems are limited to nine 5.12/6kWh modules, or six when 8.32/9kWh modules are used. Without batteries the power module must stand on the supplied base and works grid-tied only. A built-in meter with a 120A/40mA CT is included; for whole-home backup no external meter is needed, while GMK330 or GM330 meters are used for generators or larger parallel systems.

Up to ten power modules of different sizes can run in parallel, each with a WiFi/LAN Kit-20, both on-grid and off-grid. Optional GW30K-STS-G10 or GW60K-STS-G10 transfer cabinets add a SMART-PORT for a generator or large loads. An existing grid-tied PV inverter can be connected to the GRID port (coupling) or to the BACK-UP port (microgrid, single unit only). CEI 0-21 and CEI 0-16 certificates cover the power modules with the battery modules.

Monitoring and settings

Configuration and monitoring are done with the SEMS+ app and portal over Bluetooth, Wi-Fi, LAN or an optional 4G dongle, and the system supports Modbus RTU and Modbus TCP for third-party energy management. The datasheet lists one-click configuration and upgrade, and readiness for an AI-driven EMS for dynamic tariffs. After first commissioning the system fully charges the battery once to calibrate the BMS.

Questions and answers