touch/replace any components of the inverter except the DC/AC connectors. Manufacturer
assumes no responsibility for any damage to inverter or person caused by improper operation.
• Static electricity may damage electronic components. Appropriate measures must be adopted
to prevent such damage to the inverter; otherwise the inverter may be damaged and the warran-
ty will be annulled.
• 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 electrical
shock hazard. Please strictly follow the instruction we 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 manufacturer are permitted for use, otherwise the inverter may
be damaged and the warranty will be annulled.
• The inverter can exclude the possibility of DC residual currents to 6mA 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 input side, an additional fuse installation will be suggested.
The IP65 premise is that the machine is completely sealed. 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 and dust.
To our inverter product, GOODWE provides standard manufacture warranty which comes with the
product and prepaid warranty extension solution to our customer. You can find the details about
the terms and solution from below linkage.
https://en.goodwe.com/warranty.asp
This manual contains important instructions for MT series of inverter which must be followed
during installation and maintenance.
The MT series includes Four-MPPT, Three-Phase solar inverter without transformer which con-
sists of GW30KLV-MT / GW35KLV-MT / GW50KLV-MT / GW50KN-MT / GW50KBF-MT / GW60KN-MT
/ GW60KBF-MT / GW70KHV-MT / GW75K-MT / GW80KHV-MT / GW80K-MT and GW80KBF-MT
model type.
MT Series have been designed and tested strictly according to the international safety regulation.
As these are electrical and electronic equipments, related safety instructions must be complied
during installation, commissioning. Improper operation will cause serious harm to:
1. The life and well-being of the operators or a third party.
2. The inverter and other properties that belong to the operator or a third party.
Therefore the following safety instructions must be read and be always kept in mind prior to any
work. All detailed work-related safety warnings and notes will be specified at the critical points in
corresponding chapter. All installation and electrical work must only be performed by qualified
personnel. They need to meet the standards as stated below:
• Been trained specially;
• Already completely read through and understood all related documents.
• Been familiar with safety requirements of electrical 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 will pose 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 bruise if improperly handled.
• Please install it 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 minutes 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
burnt, do not touch the inverter during operation. Let it cool down before touching it.
• Without permission, opening of the inverter's front cover is not allowed. Users should not
3 Product Introduction
3.1 Intended Usage
The MT series which 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.
Inverter is dedicated to converting direct current generated by the PV modular into alternating
current, which conforms to parameters of local utility grid and fed 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 can't be connected to the PV module is that the positive or
negative terminal should be grounded, except when a transformer has been used
between the inverter and 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 TT grid structure, RMS voltage between neutral wire and earth wire must be less than
20V.
MT series GW30KLV-MT/ GW35KLV-MT / GW50KLV-MT / GW50KN-MT / GW60KN-MTV /
GW50KBF-MT / GW60KBF-MT / GW75K-MT / GW80K-MT support four different types of grid.
03 04
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