Goodwe Gmk120 Smart Meter Installation Guide (+ PDF)

GOODWE GMK120 Smart Meter

Safety Precautions

General Disclaimer

The information in this quick installation guide is subject to change due to product updates or other reasons. All descriptions here are for guidance only.
Before installations, read through the quick installation guide.
All operations should be performed by trained and knowledgeable technicians who are familiar with local standards and safety regulations.
Check the deliverables for correct model, complete contents, and intact appearance.
Contact the manufacturer if any damage is found or any component is missing.
Strictly follow the installation, operation, and configuration instructions in this guide and user manual. The manufacturer shall not be liable for equipment damage or personal injury if you do not follow the instructions. For more warranty details, please visit https://en.goodwe.com/warranty.

Safety Disclaimer

WARINING

Make sure that the device is powered off before any operations.
Ensure the cables are connected tightly, securely, and correctly. Inappropriate wiring may cause poor contact or damage the device.
Additional circuit breakers are recommended on the voltage input side to avoid personal injury or device damage.
Specification of the protective fuse should be 0.5A.
In areas at risk of lightning, if the input cable of the device exceeds 10m (33ft), you are recommended to use an external lightning protection device. If the communication cables are wired with grounded metal conduits, the lightning protection device is not necessary.
Strictly follow the National Electrical Code, ANSI/NFPA 70, and Canadian Electrical Code C22.1 during operations.

Check before Power-on

No.	Check Item
1	The product is firmly installed at a clean place that is well-ventilated and easy- to-operate.
2	The input power cables, CT Cables, and communication cables are connected correctly and securely.
3	Cable ties are intact, routed properly and evenly.

Storage

If the equipment is not to be installed or used immediately, please ensure that the storage environment meets the following requirements:
Do not unpack the outer package or throw the desiccant away.
Store the equipment in a clean place. Make sure the temperature and humidity are appropriate and no condensation.
If the smart meter has been long term stored, it should be checked by professionals before being put into use.

Federal Communications Commission (FCC) Interference Statement

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generate, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of the following measures:

Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
Consult the dealer or an experienced radio/TV technician for help. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

This device may not cause harmful interference.
this device must accept any interference received, including interference that may cause undesired operation.

FCC Caution: Any changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate this equipment.

RF exposure warning

This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment.
This equipment must be installed and operated in accordance with provided instructions and the antenna(s) used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and must not be collocated or operating in conjunction with any other antenna or transmitter.

Product Introduction

GMK120

GMK140

GM330

Waterproof box

Wiring System

GMK120

NOTE

Recommended cross-sectional area of the smart meter input power cable: 1mm2(18AWG).
CT direction: House–>Grid.
You are recommended to add fuses with a rated current of 0.5A to L1and L2 on the meter side.
To ensure the correctness of the monitoring data, connect CT1 to L1, CT2 to L2. Also, the N wire, L1, and L2 need to be connected between the loads and the utility meter.

GMK140

NOTE

Recommended cross-sectional area of the smart meter input power cable: 1mm2(18AWG).
CT direction: House–>Grid.
You are recommended to add fuses with a rated current of 0.5A to L1and L2 on the meter side.
To ensure the correctness of the monitoring data, connect CT1, CT3 to L1, CT2, CT4 to
L2. Also, the N wire, L1, and L2 need to be connected between the loads and the utility meter.

GM330

NOTE

Recommended cross-sectional area of the smart meter input power cable: 1mm2(18AWG).
Customers need to prepare CT and CT cables. Certified CTs are recommended.
Recommended cross-sectional area of the CT cable: 1.6mm2(15AWG).
CT direction: House–>Grid.
You are recommended to add fuses with a rated current of 0.5A to L1, L2, and L3 on the meter side.
To ensure the correctness of the monitoring data, connect CT1 to L1, CT2 to L2, and CT3
to L3. Also, the N wire, L1, L2,and L3 need to be connected between the loads and the utility meter.
Short circuit N and L2 in the three-phase three-line system. Set the smart meter to Three
Phase Three Line mode via Solar Go app or PV Master app. Scan the QR code below to get more information.

SolarGo App User Manual

PV Master App User Manual

Installation

Packing List

Installation and Cable Connection

DANGER

• Pay attention to the silkscreens on the device when connecting the voltage input cables. Otherwise, the device may be damaged.
Pay attention to the silkscreens on the device when connecting the CT and RS485 cables. Otherwise, the read-in data may be wrong.

NOTE

The model of the smart meter differs, but the installation and cable connection steps are the same.In this guide, the GM330 is used as an example to illustrate the installation steps.
Connect CT1+, CT1-, CT2+, and CT2- only when connecting cables of GMK120 or GMK140. CT3+ and CT3- are reserved.

Installing the rail

Model	Tightening torque for RS485 terminals
GMK120	0.2N·m
GMK140	0.2N·m
GM330	0.5N·m

Installing the waterproof box

NOTE

You are recommended to remove the cable hole cover using a screwdriver and a rubber hammer. Do not damage the smart meter when removing the cover.
You are recommended to use the cable hole at the bottom of the box to ensure its waterproof performance. Customers need to prepare PG21 and PG16 waterproof connectors and tighten the connectors at the cable hole.

Commissioning

Power ON

Step 1 Connect the smart meter cables.
Step 2 Turn on the breaker on the voltage input side. Then the smart meter is powered on.

Indicator

Type	Status	Description
	Steady on	Power on, no RS485 communication.
	Blinking	Power on, RS485 communication works properly.
	Off	Power off.
	Off	Reserved.
	Steady on	Purchasing from the utility grid.
	Blinking	Selling to the utility grid.
	Off	No purchasing or selling.
(Only for GMK140)	Steady on	Purchasing from the utility grid.
	Blinking	Selling to the utility grid.
	Off	No purchasing or selling.

Reset Button

Press Time	Description
³ 5s	Reset the smart meter.

Maintenance

DANGER

Power off the smart meter before operations and maintenance. Otherwise, the smart meter may be damaged or electric shocks may occur.

Power OFF

Turn off the breaker on the voltage input side. Then the smart meter is powered off.

WARNING

Make sure that the smart meter is powered off.
Wear proper PPE before any operations.

Removing the Smart meter

Step1 Disconnect all the cables, including input power cable cables, CT cables, RS485 communication cables.
Step2 Press the buckle at the bottom of the device to take it from the rail.
Step3 Store the smart meter properly. If the smart meter needs to be used later, ensure that the storage conditions meet the requirements.

Technical Parameters

Model			GMK120	GMK140	GM330
Technical parameters
Input	Grid		Single-phase(L/N £ 265Vac) Split-phase(L/N£ 265Vac) Three-phase(3-wire,L/L£ 265Vac) Three-phase(4-wire,L/N£ 265Vac)		Three-phase(3- wire,L/L < 576Vac) Three phase(4- wire,L/N < 520Vac)
	Frequency		50/60Hz
	Voltage	Rated voltage	208V, 120V / 240V		277V/480V
		Voltage range	0.88Un-1.1Un
	Current	Rated current	200A		5A(MAX)
		Current range	0-200A		0-5A
Communication			RS485 interface, Modbus-RTU
Communication Distance			RS485:1000m(Use shielded twisted-pair cables)
Display and button			4 LED (Power supply and network communication indicator, Wireless indicator(reserved),Energy consumption indicator1,Energy consumption indicator2), Reset button
Measurement precision			Voltage/Current: 0.5 level Active energy: 0.5 level Reactive energy: 1 level
Power supply			Power consumption £5W
Structural parameters	Dimension (L x W x H)		85 x 72 x 72mm/33.5×28.3×28.3in
	Weight		240g/0.53lb
	Installation		Rail installation
Environment paraments	Protection class		IP20
	Working temperature		-30℃-+70℃/-22℉-+158℉
	Storage temperature		-30℃-+70℃/-22℉-+158℉
	Relative humidity		0%-95%, non-condensing
	Altitude		< 3000m/9842ft

NOTE

The smart meters are not kilowatt-hour metering devices. They can only be used to calculate the element and energy in solar and hybrid systems. Please refer to the data measured by a standard kilowatt-hour meter when you need to calculate the electricity tariff.

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