ET5-10kw Parallel Solution

Author: Shawn

2021-06-30 19:12

General Introduction

Paralleling system of GoodWe three phase hybrid inverter is a solution for system capacity extension from 15kW up to 100kW. It is suitable for:

GoodWe ET series inverters (2~10 pieces in parallel)

Self-use scenarios only

Residential and minor commercial applications

Required Devices

Note:

the CTs for the system should be carefully selected according to site requirements. GoodWe offers a range of appropriate CTs, please contact GoodWe sales for further information.

System Wiring

Please notice that the paralleling is achieved only on grid side of ET inverters. The Backup output cannot be paralleled nor can one battery be connected to more than one inverter.

General Wiring System

We take the system of three ET inverters in parallel as an example.

Communication Wiring System

Communication cables should go through EMS ports and connect ET to the COM port of SEC1000S. Each COM port connect max. 4 pieces inverters, which must be daisy chained via Y-splitters. The maximum length of communication cable of each daisy-chain is 1000m.

CT and Power Cable on the SEC1000S

The power cables on the SEC1000S are used to power up the SEC1000S and to detect grid voltage. Therefore, the power cables must be connected correspondingly with CTs:

CT_A (A+/A-) connects phase L1

CT_B (B+/B-) connects phase L2

CT_C (C+/C-) connects phase L3

Note:

Please also ensure the CTs are facing the correct direction according to the installation instructions of the CTs.

In ET parallel system, the Smart Meter (GM3000) supplied with inverter is not used. Therefore, the “To Meter” cable attached on inverter is not used either. If you cut the cable off, please make sure the gland is sealed for water-proof.

For details of system wiring, please refer to technical document “GW_ET_PARALLELING SYSTEM COMPOSITION INSTRUCTION-EN” on the official website.

System Commissioning

Commissioning of ET inverters

Use GoodWe PV Master App to do the commission of each inverter separately via Wi-Fi or Bluetooth. The following figure shows how PV Master can be downloaded and connected to the inverter.

The commissioning of each inverter happens separately one by one. And please finish the commissioning of each inverter on PV Master including Basic Settings like selecting the safety code, battery type and work mode. Also it requires a unique communication address, which is executed on Advanced Setting.

Note:

1. Work Mode must be set as General Mode.

2. Please make sure the communication address for each inverter is unique from 1 to 10.

Please refer to technical document “GW_PV Master_User Manual-EN” on the official website for details of commissioning via PV Master.

Commissioning of SEC1000S

When laptop is connected to SEC1000S on NET port by a standard LAN cable, parameters such as CT ratio and system capacity can be set through ProMate.

Note:

1. Please make sure the “Total Capacity” and “Ratio of CT” are filled correctly. Otherwise the system may operate in an unexpected way.

2. If export power limit function is required, then activate “Export Enable” and set “Power Limit Value” on ProMate interface and click “Set”.

3. For export power limit function, the system will require more than 5 seconds to limit the power. Therefore, please ensure the response time meets the requirements of your project.