• Without permission, opening of the inverter's front cover is not allowed. Users should not touch
/ replace any components of the inverter except the DC / AC connectors. The manufacturer
assumes no responsibility for any damage to inverter or person caused by improper operations.
• Static electricity may damage electronic components. Appropriate measures must be adopted
to prevent such damage to the inverter. Otherwise, the warranty will be voided.
• Ensure that the output voltage of the proposed PV array is lower than the maximum rated input
voltage of the inverter; otherwise the inverter may be damaged and the warranty will be
annulled.
• If the equipment is used in a manner not specified by the manufacturer, the protection provided
by the equipment may be impaired.
• When exposed to sunlight, the PV array will generate very high voltage, which can cause an
electrical shock hazard. Please strictly follow the instructions we have provided.
• PV modules should have an IEC61730 class-A rating.
• Prohibit inserting or pulling the AC or DC terminals when the inverter is working. Otherwise the
inverter will be destroyed.
Only DC connectors provided by the manufacturer are permitted for use. Otherwise the inverter
may be damaged and the warranty will be voided.
• The inverter can exclude the possibility of DC residual currents to 6 mA in the system, where an
external RCD is required in addition to the built-in RCMU, and a type-A RCD must be used to avoid
tripping.
• The default photovoltaic module is not grounded.
• If there are more than 3 PV strings on the input side, an additional fuse installation will be
required.
The IP65 machine is completely sealed until use. Please install it within one day after
unpacking, otherwise please block the unconnected port and do not open it to ensure
that the machine is not exposed to water, moisture and dust.
To our inverter product, GOODWE provides a standard manufacturer's warranty, which comes
with the product and a prepaid warranty extension solution to our customer. You can find the
details about the terms and solutions from the below link.
https://en.goodwe.com/warranty.asp
This manual contains important instructions for the MT series of inverter which must be followed
during installation and maintenance.
The MT series includes four MPPTs and a Three-Phase solar inverter without transformer which
consists of GW30KLV-MT / GW35KLV-MT / GW50KLV-MT / GW50KN-MT / GW50KBF-MT /
GW50KBF-MT-KR / GW60KBF-MT-KR / GW60KN-MT / GW60KBF-MT /GW75KBF-MT / GW70KHV-MT
/ GW75K-MT / GW80KHV-MT / GW80K-MT and GW80KBF-MT model types.
MT Series have been designed and tested strictly according to international safety regulations.
Because these are electrical and electronic components, related safety instructions must be
complied with during installation, and commissioning. Improper operation will cause serious
harm to:
1. The life and well-being of the operators or third parties.
2. The inverter and other properties that belong to the operator or a third party.
The following safety instructions must be read and adhered to prior to any work and at all times..
All detailed work-related safety warnings and notes will be specified at the critical points in
corresponding chapters. All installation and electrical work must be performed only by qualified
personnel. These personnel must meet the standards as stated below:
• Been specially trained and licensed;
• Have thoroughly read and understood all related documents.
• Already familiar with safety requirements of electrical components and systems.
The inverter must be installed and maintained by professionals in compliance with local electrical
standards, regulations and the requirements of local power authorities or companies.
• Improper handling of the device poses a risk of injury.
• Always follow the instructions contained in the manual when moving or positioning the inverter.
• The weight of the equipment can cause injuries, serious wounds or bruises if improperly
handled.
• Please install equipment where it is out of reach of children.
• Before installing and maintaining the inverter, it is crucial to make certain that the inverter is not
electrically connected.
• Before maintaining the inverter, disconnect the connection between the AC grid and the inverter
first. Then disconnect the connection between the DC input and the inverter, the operator
should wait at least 5 min after the disconnection in case of electric shock.
• All cables must be firmly attached, undamaged, properly insulated, and adequately dimen-
sioned.
• The temperature of some parts of the inverter may exceed 60 ℃ during operation. To avoid being
burned, do not touch the inverter during operation. Let it cool down before touching it.
3 Product Introduction
3.1 Intended Usage
The MT series is a four-MPPT, three-phase transformer-less grid-connected inverter, which is a
crucial unit between the PV string and the utility grid in the PV power system.
The inverter is dedicated to converting DC generated by the PV module into AC, which conforms
to parameters of the local utility grid, feeding it into the utility grid. The intended usage of the
inverter is illustrated in the below figure.
kW.H
A B C D
The reason why the inverter cannot be connected to the PV module is that the positive or
negative terminal should be grounded, except when a transformer is used between the
inverter and the grid.
Item
A
B
C
D
Description
PV string
Inverter
Meter device
Utility grid
Note
Monocrystalline silicon, polycrystalline silicon and others.
MT Series
Meter cupboard with distributed generation system
TN-S, TN-C, TN-C-S, TT, IT
(different model types with different types of utility grid as below)
TN-S TN-C TN-C-S
TT
L1
L2
L3
N
PE
PE
Transformer
Inverter
Transformer
L1
L2
L3
PEN
PE
Inverter
L1
L2
L3
N
PE
Transformer
PE
Inverter
L1
L2
L3
N
Transformer
PE
Inverter
Note: For a TT-grid structure, the RMS voltage between the neutral wire and the earth wire must
be less than 20V.
MT series GW30KLV-MT / GW35KLV-MT / GW50KLV-MT / GW50KN-MT / GW50KBF-MT-KR /
GW60KBF-MT-KR / GW60KN-MTV / GW50KBF-MT / GW60KBF-MT / GW75K-MT / GW80K-MT
support four different types of grid.
03 04
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