Goodwe ET to support multiple battery string

Overview

The GW25K-ET, GW29.9K-ET and GW30K-ET inverters have two battery input ports, allowing multiple battery strings to be connected simultaneously. The LIFEPOWR EMS supports this configuration with the following constraints.

Limitations

The EMS manages both battery ports as a single combined battery. This means:

• State of Charge is reported as the average across all connected strings

• Charge and discharge limits apply to the combined system — per-port limits are not configurable

• If strings have asymmetric SoC, the EMS operates on the average; balancing between ports is handled by the inverter hardware

• Individual port monitoring is not available in the portal

• Asymmetric and mixed-model configurations are supported via "Unsupported Battery" — see the setup procedure below for how to calculate the correct combined parameters

• Use "Unsupported Battery" when configuring dual-port installations. Selecting a named battery model will cause portal validation to reject a combined pack count that exceeds the single-port maximum. "Unsupported Battery" has no such limit and requires manually entering the electrical parameters from the battery datasheet

Setup Procedure

1. Physical installation

Connect battery strings to both battery input terminals following the Goodwe ET installation manual.

2. Configure the battery in the LIFEPOWR portal

In Step 9 of the device configuration wizard, select "Unsupported Battery" as the battery model and fill in the fields as follows.

Do not select the specific battery model (e.g., Pylontech Force H3, GoodWe Lynx Home F). The known-model entries have pack count limits designed for a single battery input and will reject configurations that exceed them.

Set Battery Pack Count and Cells Per Battery Pack both to 1. This treats the entire combined system as a single virtual unit. Calculate the remaining fields as follows:

Cell Nominal Voltage — always use 400 V.

Cell Capacity [Ah] — divide the total energy of the combined system by 400:

Cell Capacity = Total system energy [Wh] ÷ 400

Cell Maximum Current [A] — divide the combined battery system's maximum power (the lower of total charge and total discharge capability across both ports) by 400:

Cell Maximum Current = min(combined max charge power, combined max discharge power) [W] ÷ 400

The combined max power is the sum across all towers on both ports. For each tower, multiply the per-module max current by the tower's string voltage.

Battery Description — enter the battery brand, model, and a note indicating the dual-port setup (e.g., Pylontech Force H3 — 2 ports × 3 towers × 5 modules).

Example — GW25K-ET, 2 ports, each with 3 Pylontech Force H3 towers of 5 modules:

• Total energy: 2 ports × 3 towers × 5 modules × 5.12 kWh = 153.6 kWh = 153 600 Wh

• Combined max power: 6 towers × (50 A × 512 V) = 153 600 W (charge = discharge for H3)

Example — GW25K-ET, asymmetric: port 1 with 2 Pylontech Force H3 towers of 5 modules, port 2 with 2 towers of 3 modules:

• Port 1 max power: 2 towers × (50 A × 512 V) = 51 200 W

• Port 2 max power: 2 towers × (50 A × 307.2 V) = 30 720 W

• Total energy: (2 × 5 × 5.12 kWh) + (2 × 3 × 5.12 kWh) = 81.92 kWh = 81 920 Wh

• Combined max power: 51 200 + 30 720 = 81 920 W (charge = discharge for H3)

3. Set SoC limits

Configure minimum and maximum State of Charge as usual. These apply to the combined system.

4. Verify after commissioning

Confirm in the portal that:

• Battery SoC is visible and stable

• Charge and discharge power reflects the total combined capacity

What is and is not supported