GoodWe GW15K-ET-20 15 kW Three-Phase Hybrid Solar Inverter 2 MPPT

The GoodWe GW15K-ET-20 is a 15 kW three-phase hybrid solar inverter from the ET G2 series, designed for photovoltaic installations with energy storage. It combines solar production management, high-voltage battery charging and discharging, and a powerful backup output, helping increase self-consumption and keep compatible loads powered during a grid outage.

This model includes 3 independent MPPT trackers, supports up to 24,000 W of PV input power, and works with high-voltage lithium-ion batteries within a range of 150 to 720 V. Its maximum efficiency reaches 98.2%, and it features WiFi, LAN, and Bluetooth connectivity, IP66 protection, and natural convection cooling.

15 kW three-phase hybrid inverter

The GW15K-ET-20 delivers a rated output power of 15,000 W and a rated and maximum grid apparent power of 15,000 VA. It is designed for three-phase 380/400 V grids with 3L/N/PE connection and can operate at nominal frequencies of 50 or 60 Hz.

The maximum grid output current is 21.7 A. The power factor can be adjusted from 0.8 capacitive to 0.8 inductive, and total harmonic distortion remains below 3%.

3 MPPTs for greater PV flexibility

Unlike what was initially indicated in the provided title, the official GoodWe documentation confirms that the GW15K-ET-20 has 3 independent MPPT trackers, with one PV string per MPPT.

This configuration allows the solar modules to be distributed across three groups with different orientations, tilts, or irradiance conditions. Each MPPT independently performs maximum power point tracking, making it easier to design installations with complex roofs.

The inverter supports a maximum PV input power of 24,000 W, a maximum input voltage of 1,000 V, and an MPPT operating range of 120 to 850 V. The nominal input voltage is 620 V and the start-up voltage is 150 V.

Compatible with high-power photovoltaic modules

Each MPPT supports a maximum input current of 16 A and a maximum short-circuit current of 24 A. These features make it possible to integrate today’s high-power PV modules, provided the string design complies with GoodWe’s electrical limits.

Ready for high-voltage batteries

As a hybrid inverter, the GoodWe GW15K-ET-20 includes a dedicated input for compatible lithium-ion batteries. The battery voltage range extends from 150 to 720 V, with a nominal voltage of 500 V.

The maximum continuous charge and discharge current is 40 A. For this model, GoodWe states a maximum charging power of 24,000 W and a maximum discharging power of 16,500 W.

Communication with the battery management system (BMS) is carried out via RS485 or CAN, allowing the inverter and compatible battery to work in coordination.

15 kVA backup output

One of the main advantages of the ET G2 series is its backup capability. The GW15K-ET-20 features a backup output with a rated apparent power of 15,000 VA, so it can keep selected loads powered when the grid supply is interrupted, provided there is sufficient energy available in the battery or PV array.

In off-grid operation, it can deliver up to 15,000 VA continuously and temporarily reach up to 18,000 VA for 60 seconds. This extra capacity helps start and run certain equipment with brief power demands above their nominal consumption.

GoodWe specifies backup switching for the ET G2 series equivalent to a UPS/SAI system, with a transfer time of less than 10 ms, designed to reduce interruptions in loads connected to the backup output.

Three-phase operation with unbalanced loads

The ET G2 series is designed to work with unbalanced three-phase loads, an important feature in homes and small professional installations where consumption is not evenly distributed across the three phases.

GoodWe supports 100% unbalanced supply, enabling more flexible load management within the electrical and configuration limits established for the system.

Maximum efficiency of 98.2%

The GoodWe GW15K-ET-20 achieves a maximum efficiency of 98.2% and a European efficiency of 97.5%. The maximum battery-to-grid efficiency is 97.5%, while MPPT tracking efficiency reaches 99.5%.

These performance figures are aimed at minimizing conversion losses and efficiently using both solar production and stored energy.

Integrated protections

The inverter includes different protection and monitoring functions for the PV array, the battery, and the grid connection.

• PV insulation resistance detection: integrated.
• Residual current monitoring: integrated.
• DC reverse polarity protection: integrated.
• Battery reverse polarity protection: integrated.
• Anti-islanding protection: integrated.
• AC overcurrent protection: integrated.
• AC short-circuit protection: integrated.
• AC overvoltage protection: integrated.
• DC switch: integrated.
• DC surge protection: Type II SPD.
• AC surge protection: Type II SPD.
• Remote shutdown: integrated.
• PV AFCI 3.0: available as an option.

WiFi, LAN, Bluetooth, RS485 and CAN

The GW15K-ET-20 offers different communication interfaces for integration into monitoring and energy management systems. Connection to the portal is made via WiFi, LAN, and Bluetooth, while the energy meter uses RS485.

For communication with the battery BMS, it provides RS485 and CAN interfaces. The unit includes LED indicators and allows configuration and monitoring via WLAN and the compatible GoodWe app.

Integrated smart meter

GoodWe presents the ET G2 series with an integrated smart meter, making it easier to monitor energy flows between PV generation, battery, loads, and the grid. This information allows the system to manage the different energy sources and optimize self-consumption strategies.

IP66 protection and natural cooling

The inverter has an IP66 protection rating, providing high resistance against dust and water ingress. It is designed for wall mounting and can operate in an ambient temperature range from -35 to +60 °C.

Cooling is provided by natural convection, eliminating the need for fans for normal heat dissipation. The unit supports relative humidity from 0 to 100% and a maximum operating altitude of 4,000 meters.

Technical specifications of the GoodWe GW15K-ET-20

• Brand: GoodWe.
• Model: GW15K-ET-20.
• Series: ET G2.
• Type: hybrid solar inverter.
• Grid: three-phase.
• Rated output power: 15,000 W.
• Rated grid apparent power: 15,000 VA.
• Maximum grid apparent power: 15,000 VA.
• Rated output voltage: 400 / 380 V, 3L/N/PE.
• Nominal frequency: 50 / 60 Hz.
• Maximum grid output current: 21.7 A.
• Power factor: from 0.8 capacitive to 0.8 inductive.
• Total harmonic distortion: <3%.
• Number of MPPTs: 3.
• Strings per MPPT: 1.
• Maximum PV input power: 24,000 W.
• Maximum PV input voltage: 1,000 V.
• MPPT voltage range: 120-850 V.
• PV start-up voltage: 150 V.
• PV nominal voltage: 620 V.
• Maximum input current per MPPT: 16 A.
• Maximum short-circuit current per MPPT: 24 A.
• Battery type: lithium-ion.
• Number of battery inputs: 1.
• Battery voltage range: 150-720 V.
• Battery nominal voltage: 500 V.
• Battery start-up voltage: 150 V.
• Maximum continuous charge current: 40 A.
• Maximum continuous discharge current: 40 A.
• Maximum charging power: 24,000 W.
• Maximum discharging power: 16,500 W.
• Backup rated power: 15,000 VA.
• Maximum off-grid backup power: 15,000 VA continuous / 18,000 VA for 60 s.
• Maximum backup output current: 21.7 A / 26.1 A for 60 s.
• Backup switching time: <10 ms according to GoodWe.
• Maximum efficiency: 98.2%.
• European efficiency: 97.5%.
• Maximum battery-to-grid efficiency: 97.5%.
• MPPT efficiency: 99.5%.
• BMS communication: RS485 and CAN.
• Meter communication: RS485.
• Portal connectivity: WiFi, LAN, and Bluetooth.
• User interface: LED, WLAN, and app.
• DC surge protection: Type II.
• AC surge protection: Type II.
• AFCI 3.0: optional.
• Cooling: natural convection.
• Protection rating: IP66.
• Operating temperature: -35 to +60 °C.
• Relative humidity: 0-100%.
• Maximum altitude: 4,000 m.
• Topology: transformerless.
• Mounting: wall-mounted.
• Dimensions: 496 x 460 x 221 mm.
• Weight: 25 kg.

Complete management of generation, storage, and backup

The GoodWe GW15K-ET-20 combines solar energy conversion, high-voltage battery management, and a 15 kVA three-phase backup output in a single unit. Its three MPPTs make it possible to design solar arrays with different orientations, while the up to 24 kW PV input provides a wide margin for system sizing.

The combination of 15 kW rated power, 98.2% maximum efficiency, 150 to 720 V battery range, fast-switching backup, IP66 protection, and WiFi, LAN, and Bluetooth connectivity makes the GW15K-ET-20 a particularly complete solution for three-phase photovoltaic installations with storage and a greater need for energy independence.

Important: the battery, PV array, external protections, and other installation components must be selected from compatible solutions and sized according to GoodWe specifications and applicable regulations.