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Goodwe CT90 - User Manual

Goodwe CT90
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User Manual
Power Limit Solution for Grid-Tied PV Inverters
V1.0-2022-09-15
WARNING
1. Power o the equipment in the system before operations and maintenance. Otherwise, the equipment may be damaged or
electric shocks may occur.
2. The installation, electrical connection, and commissioning of the inverter, smart meter, communication box and other devices
in the system are not mentioned in this document. Please refer to the related user manual from the ocial website: https://
en.goodwe.com/
General Safety
System Safety
Matching Table
NOTICE
• The information in this user manual is subject to change due to product updates or other reasons. This guide cannot replace
the product labels or the safety precautions in the user manual unless otherwise specied. All descriptions in the manual are for
guidance only.
• Before installations, read through the corresponding user manual to learn about the product and the precautions. Strictly follow
its requirements.
• All installations should be performed by trained and knowledgeable technicians who are familiar with local standards and safety
regulations.
• Use insulating tools and wear personal protective equipment when operating the equipment to ensure personal safety. Wear
anti-static gloves, cloths, and wrist strips when touching electron devices to protect the inverter from damage.
• Strictly follow the installation, operation, and conguration instructions in this manual. The manufacturer shall not be liable for
equipment damage or personal injury if you do not follow the instructions.
1 Safety Precaution
2 Networking
Product CT90 GM3000 HK3000 GM3000C SEC1000
DNS Series O × × × ×
XS Series O × × × ×
MS Series O × × × ×
NS Series O × × × ×
SDT G2 Series × O O O O
SMT Series × O O O O
MT Series × O × O O
HV 1100 Series × × × O O
Note The load current shall be
less than 90A.
The load current of each phase shall be
less than 120A.
The load current of any phase shall be more
than 120A.
• For some inverter series, the power limit function is not available. Please contact After-sales Service if needed.
• In networking systems with GM3000C + EzLogger Pro, or SEC1000, the power limit function can be fullled for multiple inverters
in parallel.
• In networking systems with CT90, GM3000 or HK3000, it is only able to realize power limit function for single inverter.

Table of Contents

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Do you have a question about the Goodwe CT90 and is the answer not in the manual?

Summary

Safety Precaution

General Safety

Provides general safety guidelines and notices for equipment handling.

System Safety

Highlights critical warnings for system safety, including powering off equipment.

Networking

Matching Table

Table showing compatibility of different inverter series with networking products.

Single-Phase Inverter + CT90 Networking

Details setup and wiring for single-phase inverters with CT90.

Three-Phase Inverter + GM3000 Networking

Details setup and wiring for three-phase inverters with GM3000.

Three-Phase Inverter + HK3000 Networking

Details setup and wiring for three-phase inverters with HK3000.

Three-Phase Inverter + GM3000 C Networking

Details setup and wiring for three-phase inverters with GM3000C.

System with Multiple Inverters

Details setup for multiple inverters using GM3000C for power limit function.

Three-Phase Inverter + SEC1000 Networking

Details setup and CT specifications for SEC1000 networking.

Parameter Setting

Setting Power Limit Parameters via LCD

Steps to set power limit parameters directly on the inverter's LCD screen.

Setting Power Limit Parameters via SolarGo App

Guide to setting power limit parameters using the SolarGo mobile application.

Setting Power Limit Parameters via ProMate

Instructions for setting power limit parameters using ProMate software.

Troubleshooting

Single Inverter Communication Loss

Describes inverter derating behavior when communication is lost for single inverters.

Multiple Inverters Communication Loss

Describes inverter standby behavior when communication is lost for multiple inverters.

Summary

Safety Precaution

General Safety

Provides general safety guidelines and notices for equipment handling.

System Safety

Highlights critical warnings for system safety, including powering off equipment.

Networking

Matching Table

Table showing compatibility of different inverter series with networking products.

Single-Phase Inverter + CT90 Networking

Details setup and wiring for single-phase inverters with CT90.

Three-Phase Inverter + GM3000 Networking

Details setup and wiring for three-phase inverters with GM3000.

Three-Phase Inverter + HK3000 Networking

Details setup and wiring for three-phase inverters with HK3000.

Three-Phase Inverter + GM3000 C Networking

Details setup and wiring for three-phase inverters with GM3000C.

System with Multiple Inverters

Details setup for multiple inverters using GM3000C for power limit function.

Three-Phase Inverter + SEC1000 Networking

Details setup and CT specifications for SEC1000 networking.

Parameter Setting

Setting Power Limit Parameters via LCD

Steps to set power limit parameters directly on the inverter's LCD screen.

Setting Power Limit Parameters via SolarGo App

Guide to setting power limit parameters using the SolarGo mobile application.

Setting Power Limit Parameters via ProMate

Instructions for setting power limit parameters using ProMate software.

Troubleshooting

Single Inverter Communication Loss

Describes inverter derating behavior when communication is lost for single inverters.

Multiple Inverters Communication Loss

Describes inverter standby behavior when communication is lost for multiple inverters.

Overview

  1. Function Description
  2. Important Technical Specifications
  3. Usage Features
  4. Maintenance Features

This document outlines the "Power Limit Solution for Grid-Tied PV Inverters" from GoodWe, providing a user manual for setting up and managing power limits in various inverter networking configurations. The primary function of this solution is to enable grid-tied PV inverters to limit their power output, typically to comply with local grid standards, prevent over-generation, or manage energy consumption within a household or facility.

Function Description:

The power limit solution allows users to control the amount of power their PV inverters feed into the utility grid. This is achieved through the integration of smart meters (CT90, GM3000, HK3000, GM3000C, SEC1000) and, in some multi-inverter systems, an EzLogger Pro. These devices monitor the load current and grid interaction, enabling the inverter(s) to adjust their output accordingly. The system supports both single-phase and three-phase inverter configurations, with specific smart meter models tailored to each.

For single-phase inverters, the CT90 is used to monitor the load current, ensuring it remains below 90A. This setup is designed for a single inverter system. For three-phase inverters, GM3000 or HK3000 smart meters are used, monitoring load currents up to 120A per phase. These are also typically for single inverter installations. For more complex three-phase systems, especially those with higher load currents (exceeding 120A per phase) or multiple inverters in parallel, the GM3000C or SEC1000 smart meters are employed. These systems often require external Current Transformers (CTs) with specific transformation ratios and precision, and may integrate an EzLogger Pro for managing multiple inverters.

The core mechanism involves the CTs measuring the current flow between the inverter(s) and the grid. This data is then communicated to the inverter or a central management unit (like EzLogger Pro or SEC1000), which then instructs the inverter(s) to limit their power output to the predefined "power limit value."

Important Technical Specifications:

  • Load Current Capacities:
    • CT90: Load current less than 90A.
    • GM3000/HK3000: Load current of each phase less than 120A.
    • GM3000C/SEC1000: Load current of any phase more than 120A.
  • Applicable Inverter Series:
    • CT90: DNS, XS, MS, NS series.
    • GM3000/HK3000: SDT G2, SMT, MT series.
    • GM3000C/SEC1000: SDT G2, SMT, MT, HT 1100V series.
  • CT Specifications for GM3000C/SEC1000 (External CTs):
    • Current Transformation Ratio: nA/5A (n between 200-5000, user-selectable based on conditions). 5A refers to CT secondary output current.
    • Sampling Error: ≤ 1% (recommended precision: 0.5, 0.5s, 0.2, or 0.2s).
    • Recommended Wire Diameter for CT Secondary Output Cable: 1.5mm (1.5mm² cross-sectional area).
    • CT Bore Diameter: Must be larger than the outer diameter of the AC power cable to allow insertion.
  • CT Specifications for SEC1000 (External CTs based on Current Scope):
    • Imax < 250A: CT 200A Acrel/AKH-0.66 (200A/5A) closed type (31mm11mm, Φ22mm). Also 250A/5A Acrel/AKH-0.66-K-30x20-250/5 open type (32mm22mm, 0.5% precision) or 250A/5A Acrel/AKH-0.66-K-60x40-250/5 open type (62mm*42mm, 1.0% precision).
    • 250A ≤ Imax < 1000A: CT 1000A/5A Acrel/AKH-0.66-K-60x40-1000/5 open type (62mm42mm, 0.5% precision). Also 1000A/5A Acrel/AKH-0.66-K-80x40-1000/5 open type (82mm42mm, 0.5% precision) or 1000A/5A Acrel/AKH-0.66-K-80x80-1000/5 open type (82mm*42mm, 0.5% precision).
    • 1000A ≤ Imax < 5000A: CT 5000A/5A Acrel/AKH-0.66-K-140x60-5000/5 open type (142mm62mm, 0.2% precision). Also 5000A/5A Acrel/AKH-0.66-K-160x80-5000/5 open type (162mm82mm, 0.2% precision).
  • Communication: RS485 for smart meters to inverter(s), LAN for SEC1000 to router/monitoring system. Inverters can also communicate via WiFi, LAN, 4G, GPRS, Bluetooth or Wi-Fi/LAN module for app-based parameter setting.

Usage Features:

  • Single Inverter vs. Multiple Inverters: The solution distinguishes between single inverter installations (CT90, GM3000, HK3000) and multiple inverter systems (GM3000C, SEC1000 + EzLogger Pro).
  • CT Installation Direction: Crucial for correct operation. If CTs are installed reversely, an alarm will be triggered, and the power limit function will not work. The "-->" direction on the CT indicates current flow towards the grid.
  • CT Placement: CTs must be snap-fitted on the Live (L) cables (L, L1, L2, L3) and not on the Neutral (N) cable. For GM3000C/SEC1000, CTs should be near the grid-tied entry point.
  • Parameter Setting Methods:
    • LCD (for inverters with LCD): Users can set power limit parameters directly on the inverter's LCD screen. This involves navigating menus, adjusting values with short presses, and confirming with long presses. This method is applicable for non-MT and non-SMT series inverters that are wired and powered on.
    • SolarGo App: For inverters connected via WiFi, LAN, 4G, GPRS, Bluetooth, or Wi-Fi/LAN module, parameters can be set using the SolarGo App. This provides a user-friendly interface to configure "Export/Power Limit," "Mode" (single-phase/three-phase), "Export Power," and "External CT Ratio." The app also allows enabling "Export Power Limit Protection" to stop grid tying if the limit fails.
    • ProMate Software (with EzLogger Pro or SEC1000): For systems with EzLogger Pro or SEC1000, power limit parameters can be set via ProMate software on a computer. This includes setting "Total Capacity," "Power Limit," and "Ratio of CT." ProMate supports both dynamic and static IP modes for communication with the SEC1000/EzLogger Pro.
  • Real-time Monitoring: ProMate UI allows real-time monitoring of Active Power, Voltage, and Current to confirm the power limit function is enabled and working correctly.
  • CT Cable Length: Standard CTs from GoodWe come in 5m or 30m lengths, with the choice depending on the distance between the inverter and the distribution board entry point.

Maintenance Features:

  • Safety Precautions: Emphasizes powering off equipment before operations and maintenance, using insulating tools, wearing personal protective equipment (anti-static gloves, cloths, wrist strips), and adhering to local standards and safety regulations.
  • Troubleshooting:
    • CT Installation: Reversible CT installation is a common issue, triggering alarms and preventing power limit function. Correct direction is critical.
    • Communication Disconnection:
      • Single Inverter: If communication is disconnected, the inverter can still derate based on the set power limit percentage.
      • Multiple Inverters (with SEC1000/EzLogger Pro): If communication with SEC1000 or EzLogger Pro is disconnected, inverters run for 10 minutes then go to standby. If disconnected from the smart meter, they run based on the set power limit percentage.
  • Firmware Updates: The document notes that UI figures are based on specific firmware versions (e.g., DNS series V1.00.00), implying that updates may alter the interface.
  • Professional Setup: Power parameters should be set by professionals to prevent incorrect configurations that could affect generating capacity.
  • Password Management: For SolarGo App, users are advised to change the initial password immediately and regularly to ensure account security.
  • Documentation: Users are directed to refer to the inverter's user manual, quick installation guide, and specific documents for CT wiring and parameter setting details, as appearances and communication ports vary by inverter type. Links and QR codes are provided for EzLogger Pro and SEC1000 user manuals.

Goodwe CT90 Specifications

General IconGeneral
BrandGoodwe
ModelCT90
CategoryTransducer
LanguageEnglish