Growatt 7000MTL-S User manual

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Growatt 7000MTL-S
Growatt 8000MTL-S
Installation & Operation Manual

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Manual Introduce and Copyright
Copyright © 2019 Growatt New Energy Technology Co., Ltd All rights reserved.
No part of this document may be reproduced, stored in a retrieval system, or
transmitted, in any form or by any means, electronic, mechanical, photographic,
magnetic or otherwise, without the prior written permission of Growatt New Energy
Technology Co., Ltd.
Growatt New Energy Technology Co., Ltd makes no representations, express or
implied, with respect to this documentation or any of the equipment and/or software it
may describe, including (with no limitation) any implied warranties of utility,
merchantability, or fitness for any particular purpose. All such warranties are
expressly disclaimed. Neither Growatt New Energy Technology Co., Ltd nor its
distributors or dealers shall be liable for any indirect, incidental, or consequential
damages under any circumstances.
(The exclusion of implied warranties may not apply in all cases under some statutes,
and thus the above exclusion may not apply.)
Specifications are subject to change without notice. Every attempt has been made to
make this document complete, accurate and up-to-date. Readers are cautioned,
however, that Growatt reserves the right to make changes without notice and shall not
be responsible for any damages, including indirect, incidental or consequential
damages, caused by reliance on the material presented, including, but not limited to,
omissions, typographical errors, arithmetical errors or listing errors in the content
material.
All trademarks are recognized even if these are not marked separately. Missing
designations do not mean that a product or brand is not a registered trademark.
Growatt New Energy Technology CO.,LTD
1st East & 3rd Floor,Building 5,Jiayu Industrial Zone,Xibianling,Shangwu Village,Shiyan,
Baoan District,Shenzhen,P.R.China

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Index
1 Notes on this manual......................................................................................................................5
1.1 Validity................................................................................................................................5
1.2 Target Group .......................................................................................................................5
1.3 Additional information........................................................................................................5
1.4 Symbols in this document...................................................................................................5
1.4.1 Warnings in this document.......................................................................................5
1.4.2 Markings on this product..........................................................................................6
1.5 Glossary ..............................................................................................................................7
2 Safety .............................................................................................................................................8
2.1 Intended Use .......................................................................................................................8
2.2 Qualification of skilled person............................................................................................9
2.3 Safety instruction ................................................................................................................9
2.4 Assembly Warnings...........................................................................................................10
2.5 Electrical Connection Warnings........................................................................................10
2.6 Operation Warnings...........................................................................................................11
3 Product description ......................................................................................................................13
3.1 MTL-S Overview..............................................................................................................13
3.2 Type label..........................................................................................................................13
3.3 Size and weight.................................................................................................................15
3.4 Storage of Inverter.............................................................................................................15
3.5 The advantage of the unit..................................................................................................15
4 Unpacking and inspection............................................................................................................15
5 Installation....................................................................................................................................17
5.1 Safety instructions.............................................................................................................17
5.2 Selecting the installation location .....................................................................................18
5.3 Mounting the Inverter .......................................................................................................21
5.3.1 Mounting the Inverter with bracket........................................................................21
5.3.2 Fixed the inverter on the wall.................................................................................22
6 Electrical connection....................................................................................................................23
6.1 Safety ................................................................................................................................24
6.2 Wiring AC Output.............................................................................................................24
6.3 connecting the second protective conductor .....................................................................28
6.4 Connecting the PVArray (DC input)................................................................................29
6.4.1 Conditions for DC Connection...............................................................................29
6.4.2 Connecting the PV Array (DC input).....................................................................30
6.5 Grounding the inverter......................................................................................................30
6.6 RS485 cable connection....................................................................................................30
6.7 Inverter demand response modes (DRMs,only forAustralia)...........................................33
6.7.1 RJ45 socket pin assignment...................................................................................33
6.7.2 Method of asserting demand response modes........................................................33
7 Commissioning ............................................................................................................................33
7.1 General LCD display.........................................................................................................34

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7.1.1 Power on display....................................................................................................34
7.1.2 LCD Display when background light off...............................................................35
7.1.3 The Second line can change by knock on ..............................................................35
7.1.4 Connecting messages.............................................................................................36
7.2 Operate by knock ..............................................................................................................37
7.2.1 Knock type and definition......................................................................................37
7.2.2 Light background and check running information.................................................37
7.2.3 Set inverter COM address......................................................................................37
7.2.4 Set inverter display language .................................................................................38
7.2.5 Set inverter time.....................................................................................................38
7.2.6 Inverter faulty messages.........................................................................................39
7.2.7AC Error Record Checking....................................................................................39
7.2.8 Communication Type choice..................................................................................39
7.3 Communications .......................................................................................................................40
7.3.1 RS232 (standard)....................................................................................................40
7.3.2 WIFI(Optional).......................................................................................................40
8.Start-Up and shut down the inverter ............................................................................................41
8.1 Start-Up the inverter..........................................................................................................41
8.2 Turn-off the Inverter..........................................................................................................41
9 Maintenance and Cleaning...........................................................................................................41
9.1 Checking Heat Dissipation................................................................................................41
9.2 Cleaning the Inverter.........................................................................................................41
9.3 Checking the DC Disconnect............................................................................................42
10 Trouble shooting ........................................................................................................................42
10.1 Warnings(W)...................................................................................................................42
10.2 Errors(E)..........................................................................................................................43
11 Manufacturer Warranty ..............................................................................................................44
12 Decommissioning.......................................................................................................................44
12.1 Dismantling the Inverter .................................................................................................44
12.2 Packing the Inverter ........................................................................................................45
12.3 Storing the Inverter .........................................................................................................45
12.4 Disposing of the Inverter.................................................................................................45
13 Technical Data............................................................................................................................45
13.1 Specification....................................................................................................................45
13.2 DC connector info........................................................................................................47
13.3 Torque .............................................................................................................................47
13.4Accessories......................................................................................................................47
14 PV system installation................................................................................................................48
15 Compliance Certificates.............................................................................................................49
15.1 List ..................................................................................................................................49
15.2 Download Address..........................................................................................................50
16 Contact.......................................................................................................................................50

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1 Notes on this manual
1.1 Validity
This manual describes the assembly, installation, commissioning and maintenance of
the following Growatt Inverter model:
Growatt 7000MTL-S
Growatt 8000MTL-S
This manual does not cover any details concerning equipment connected to the
Growatt MTL-S( e.g. PV modules). Information concerning the connected equipment
is available from the manufacturer of the equipment.
1.2 Target Group
This manual is for qualified personnel. Qualified personnel have received training and have
demonstrated skills and knowledge in the construction and operation of this device. Qualified
Personnel are trained to deal with the dangers and hazards involved in installing electric devices.
1.3 Additional information
Find further information on special topics in the download area at www.ginverter.com
The manual and other documents must be stored in a convenient place and be
available at all times. We assume no liability for any damage caused by failure to
observe these instructions. For possible changes in this manual, GROWATT NEW
ENERGY TECHNOLOGY CO.,LTD accepts no responsibilities to inform the users.
1.4 Symbols in this document
1.4.1 Warnings in this document
A warning describes a hazard to equipment or personnel. It calls attention to a
procedure or practice, which, if not correctly performed or adhered to, could result in
damage to or destruction of part or all of the Growatt equipment and/or other
equipment connected to the Growatt equipment or personal injury.

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Symbol
description
DANGER
DANGER indicates a hazardous situation which, if not avoided, will
result in death or serious injury.
WARNING
WARNING indicates a hazardous situation which, if not avoided, could
result in death or serious injury.
CAUTION
CAUTION indicates a hazardous situation which, if not avoided, could
result in minor or moderate injury.
NOTICE
NOTICE is used to address practices not related to personal injury.
Information
Information that you must read and know to ensure optimal operation of
the system.
1.4.2 Markings on this product
Symbol
Explanation
Electrical voltage!
Risk of fire or explosion！
Risk of burns
Operation after 5 minutes

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Point of connection for grounding
protection
Direct Current (DC)
Alternating Current (AC)
CE mark.
The inverter complies with the
requirements of the applicable CE
guidelines.
The inverter must not be disposed of
with the household waste.
1.5 Glossary
AC
Abbreviation for "Alternating Current"
DC
Abbreviation for "Direct Current"
Energy
Energy is measured in Wh (watt hours), kWh (kilowatt hours) or MWh (megawatt
hours). The energy is the power calculated over time. If, for example, your inverter
operates at a constant power of 4600 W for half an hour and then at a constant power
of 2300 W for another half an hour, it has fed 3450Wh of energy into the power
distribution grid within that hour.
Power
Power is measured in W (watts), kW (kilowatts) or MW (megawatts). Power is an
instantaneous value. It displays the power your inverter is currently feeding into the
power distribution grid.
Power rate
Power rate is the radio of current power feeding into the power distribution grid and

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the maximum power of the inverter that can feed into the power distribution grid.
Power Factor
Power factor is the ratio of true power or watts to apparent power or volt amps. They
are identical only when current and voltage are in phase than the power factor is 1.0.
The power in an ac circuit is very seldom equal to the direct product of the volts and
amperes. In order to find the power of a single phase ac circuit the product of volts
and amperes must be multiplied by the power factor.
PV
Abbreviation for photovoltaic
wireless communication
The external wireless communication technology is a radio technology that allows the
inverter and other communication products to communicate with each other. The
external wireless communication does not require line of sight between the devices
and it is selective purchasing.
2 Safety
2.1 Intended Use
The unit converts the DC current generated by the photovoltaic (PV) modules to grid-compliant
alternating current and performs single-phase feed-in into the electricity grid.Growatt 7000
MTL-S,Growatt 8000MTL-S inverters are built according to all required safety rules.
Nevertheless, improper use may cause lethal hazards for the operator or third parties, or may result
in damage to the units and other property.
Principle of a PV plant with this GROWATT XXXXMTL-S single-phase inverter

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Position
Description
A/B
PV modules
C
Circuit breaker
D
Growatt Inverter
E
Energy meter
F
Utility grid
The inverter may only be operated with a permanent connection to the public power grid. The
inverter is not intended for mobile use. Any other or additional use is not considered the intended
use. The manufacturer/supplier is not liable for damage caused by such unintended use. Damage
caused by such unintended use is at the sole risk of the operator.
PV modules Capacitive Discharge Currents
PV modules with large capacities relative to earth, such as thin-film PV modules with cells on a
metallic substrate, may only be used if their coupling capacity does not exceed 470nF. During
feed-in operation, a leakage current flows from the cells to earth, the size of which depends on the
manner in which the PV modules are installed (e.g. foil on metal roof) and on the weather (rain,
snow). This "normal" leakage current may not exceed 50mA due to the fact that the inverter would
otherwise automatically disconnect from the electricity grid as a protective measure.
2.2 Qualification of skilled person
This grid-tied inverter system operates only when properly connected to the AC -distribution
network. Before connecting the Growatt MTL-S to the power distribution grid, contact the local
power distribution grid company. This connection must be made only by qualified technical
personnel to connect, and only after receiving appropriate approvals, as required by the local
authority having jurisdiction.
2.3 Safety instruction
The GROWATT MTL-S Inverters is designed and tested according to international safety
requirements（IEC62109-1,CE, AS4777）; however, certain safety precautions must be observed
when installing and operating this inverter. Read and follow all instructions, cautions and warnings
in this installation manual. If questions arise, please contact Growatt’s technical services at +86
(0)755 2747 1942.

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2.4 Assembly Warnings
2.5 Electrical Connection Warnings
WARNING
Prior to installation, inspect the unit to ensure absence of any transport
or handling damage, which could affect insulation integrity or safety
clearances; failure to do so could result in safety hazards.
Assemble the inverter per the instructions in this manual. Use care
when choosing installation location and adhere to specified cooling
requirements.
Unauthorized removal of necessary protections, improper use,
incorrect installation and operation may lead to serious safety and
shock hazards and/or equipment damage.
In order to minimize the potential of a shock hazard due to hazardous
voltages, cover the entire solar array with dark material prior to
connecting the array to any equipment.
CAUTION
Grounding the PV modules：The Growatt MTL-S is a transformerless
inverter. Do not ground the DC circuits of the PV modules connected
to the Growatt MTL-S. Only ground the mounting frame of the PV
modules.If you connect grounded PV modules to the Growatt MTL-S,
the error message "PV ISO Low".
Comply with the local requirements for grounding the PV modules and
the PV generator. GROWATT recommends connecting the generator
frame and other electrically conductive surfaces in a manner which
ensures continuous conduction with ground in order to have optimal
protection of the system and personnel.
DANGER
The components in the inverter are live. Touching live components can result
in serious injury or death.
Do not open the inverter except the wire box by qualified persons.
Electrical installation, repairs and conversions may only be carried out by
electrically qualified persons.
Do not touch damaged inverters.
Danger to life due to high voltages in the inverter
There is residual voltage in the inverter. The inverter takes 5 minutes to
discharge.
Wait 5 minutes before you open the wire box.
Persons with limited physical or mental abilities may only work with the
Growatt inverter following proper instruction and under constant supervision.
Children are forbidden to play with the Growatt inverter. Must keep the

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2.6 Operation Warnings
Growatt inverter away from children.
WARNING
Make all electrical connections (e.g. conductor termination, fuses, PE
connection, etc.) in accordance with prevailing regulations. When working
with the inverter powered on, adhere to all prevailing safety regulations to
minimize risk of accidents.
Systems with inverters typically require additional control (e.g., switches,
disconnects) or protective devices (e.g., fusing circuit breakers) depending
upon the prevailing safety rules.
CAUTION
The Growatt Inverter converts DC Current from PV generator into AC
current. The inverter is suitable for mounting indoors and outdoors.
You can use the AC current gernerated as follows:
House grid:
Energy flows into the house grid. The consumers connected,
for example, household devices or lighting, consume the
energy. The energy left over is fed into the public grid. When
the Growatt is not gernerating any energy, e.g., at night, the
consumers which are connected are supplied by the public
grid.The Growatt does not have its own energy meter. When
energy is fed into the public grid, the energy meter spins
backwards.
Public grid:
Energy is fed directly into the public grid. The Growatt is
connected to a separate energy meter. The energy produced is
compensated at a rate depending on the electric power
company.

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WARNING
Ensure all covers and doors are closed and secure during operation.
Although designed to meet all safety requirements, some parts and
surfaces of Inverter are still hot during operation. To reduce the risk of
injury, do not touch the heat sink at the back of the PV-Inverter or nearby
surfaces while Inverter is operating.
Incorrect sizing of the PV plant may result in voltages being present which
could destroy the inverter. The inverter display will read the error message
“PV voltage High!”
Turn the rotary switch of the DC Disconnect to the Off position
immediately.
Contact installer.
CAUTION
All operations regarding transport, installation and start-up, including
maintenance must be operated by qualified, trained personnel and in
compliance with all prevailing codes and regulations.
Anytime the inverter has been disconnected from the power network, use
extreme caution as some components can retain charge sufficient to create
a shock hazard; to minimize occurrence of such conditions, comply with
all corresponding safety symbols and markings present on the unit and in
this manual.
In special cases, there may still be interference for the specified
application area despite maintaining standardized emission limit values
(e.g. when sensitive equipment is located at the setup location or when the
setup location is near radio or television receivers).In this case, the
operator is obliged to take proper action to rectify the situation.
Do not stay closer than 20 cm to the inverter for any length of time.

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3 Product description
3.1 MTL-S Overview
Symbol on the inverter
3.2 Type label
The type labels provide a unique identification of the inverter (The type of product,
Position
Description
A
LCD
B
LED
C
PV Input
D
DC Switch
E
RS485 terminal
F
RJ45 connector (only for Australia)
G
AC Output
Symbol
Description
Explanation
Tap symbol
Setting the display operation by tapping the LCD (see
Section 7).
NORMALL
FAULT
Inverter status
symbol
Indicates inverter operation status

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Device-specific characteristics, Certificates and approvals). The type labels are on the
right-hand side of the enclosure.
More detail about the type label as the chart below:
Model Name
Growatt
7000MTL-S
Growatt
8000MTL-S
Max input DC voltage
550V
Max input DC current
25A/12.5A
PV voltage range
80V~550V
AC nominal voltage
230V
AC grid frequency
50Hz
Max. apparent power
7000VA
8200VA
AC normal output
current
30.4A
35.7A
Power factor
0.8leading…0.8lagging
Environmental
Protection
Rating
IP65
Operation Ambient
temperature
25...+60℃(-13...+ 140°F)
with derating above 45°C（113°F）

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3.3 Size and weight
Dimensions and weight
Model
Height (H)
Width (W)
Depth (D)
Weight
Growatt 7000MTL-S
419mm 16.5inch
355mm 14.0inch
185mm 7.2inch
16.8kg
Growatt 8000MTL-S
419mm 16.5inch
355mm 14.0inch
185mm 7.2inch
16.8kg
3.4 Storage of Inverter
If you want to storage the inverter in your warehouse, you should choose an
appropriate location to store the inverter.
The unit must be stored in original package and desiccant must be left in the
package.
The storage temperature should be always between -25℃and +60℃. And the
storage relative humidity can achieve to 100%.
If there are a batch of inverters need to be stored, the maximum layers for original
carton is four.
After long term storage, local installer or service department of GROWATT
should perform a comprehensive test before installation
3.5 The advantage of the unit
Maximum efficiency of 98.4%
Wide input voltage range from 80--550Vdc
Reactive power regulate
Integrated DC switch
Multi MPP controller
DSP controller
Sound control
Multi communication pattern
Easy installation
4 Unpacking and inspection
The inverter is thoroughly tested and inspected strictly before delivery. Our inverters
leave our factory in proper electrical and mechanical condition. Special packaging

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ensures safe and careful transportation. However, transport damage may still occur.
The shipping company is responsible in such cases. Thoroughly inspect the inverter
upon delivery. Immediately notify the responsible shipping company if you discover
any damage to the packaging which indicates that the inverter may have been
damaged or if you discover any visible damage to the inverter. We will be glad to
assist you, if required. When transporting the inverter, the original or equivalent
packaging should be used, and the maximum layers for original carton is four, as this
ensures safe transport.
After opening the package, please check the contents of the box. It should contain the
following, Please check all of the accessories carefully in the carton. If anything
missing, contact your dealer at once.
Item
Description
Quantity
A
Inverter
1
B
Mounting frame
1
C
Quick Guide &User manual
1
D
RJ45 connector (only for Australia)
1
E
Mounting screws
6
F
Safety-lock screws
1
G
Mounting frame screws sleeve
6
H
PV+/PV- terminal
3/3
I
PV+/PV- metal terminal
3/3
J
Cable gland for AC connection
1
K
AC connector tool
1
L
RS485 terminal
2

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5 Installation
5.1 Safety instructions
Danger to life due to fire or explosion
Despite careful construction, electrical devices can cause fires.
Do not install the inverter on easily flammable materials and where
flammable materials are stored.
Risk of burns due to hot enclosure parts
Mount the inverter in such a way that it cannot be touched inadvertently.
All electrical installations shall be done in accordance with the local and national
electrical codes. Do not remove the casing. Inverter contains no user serviceable
parts. Refer servicing to qualified service personnel. all wiring and electrical
installation should be conducted by a qualified service personnel .
Carefully remove the unit from its packaging and inspect for external damage. If
you find any imperfections, please contact your local dealer.
Be sure that the inverters connect to the ground in order to protect property and
personal safety.
The inverter must only be operated with PV generator. Do not connect any other
source of energy to it.
Both AC and DC voltage sources are terminated inside the PV Inverter. Please
disconnect these circuits before servicing.
This unit is designed to feed power to the public power grid (utility) only. Do not
connect this unit to an AC source or generator. Connecting Inverter to external
devices could result in serious damage to your equipment.
When a photovoltaic panel is exposed to light, it generates a DC voltage. When
connected to this equipment, a photovoltaic panel will charge the DC link
capacitors.
Energy stored in this equipment’s DC link capacitors presents a risk of electric
shock. Even after the unit is disconnected from the grid and photovoltaic panels,
high voltages may still exist inside the PV-Inverter. Do not remove the casing
until at least 5 minutes after disconnecting all power sources.
Although designed to meet all safety requirements, some parts and surfaces of
Inverter are still hot during operation. To reduce the risk of injury, do not touch
the heat sink at the back of the PV-Inverter or nearby surfaces while Inverter is
operating.

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5.2 Selecting the installation location
This is guidance for installer to choose a suitable installation location, to
avoid potential damages to device and operators.
The installation location must be suitable for the inverter's weight and
dimensions for a long period time.
Select the installation location so that the status display can be easily viewed.
Do not install the inverter on structures constructed of flammable or
thermolabile materials.
Never install the inverter in environment of little or no air flow, nor dust
environment. That may derate the efficiency of the cooling fan of the
inverter.
The Ingress Protection rate is IP65 which means the inverter can be installed
outdoors and indoors.
The humidity of the installation location should be 0~100% without
condensation.
The installation location must be freely and safely to get at all times.
Vertically installation and make sure the connection of inverter must be
downwards. Never install horizontal and avoids forward and sideways tilt.
Be sure that the inverter is out of the children’s reach.
Don’t put any things on the inverter. Do not cover the inverter.
Do not install the inverter near television antenna or any other antennas and
antenna cables.
Inverter requires adequate cooling space. Providing better ventilation for the
inverter to ensure the heat escape adequately. The ambient temperature

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should be below 40°C to ensure optimum operation.
Do not expose the inverter to direct sunlight, as this can cause excessive
heating and thus power reduction.
Observe the Min. clearances to walls, other inverters, or objects as shown in
the diagram:
Direction
Min. clearance (cm)
above
30
below
50
sides
30
front
30
Ambient dimensions of one inverter

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Ambient dimensions of series inverters
There must be sufficient clearance between the individual inverters to
ensure that the cooling air of the adjacent inverter is not taken in.
If necessary, increase the clearance spaces and make sure there is enough
fresh air supply to ensure sufficient cooling of the inverters.
The inverter can’t install to solarization，drench，firn location. We suggest that the inverters should
be installed at the location with some cover or protection。