2.3 Safety instructions
1.Please read this manual carefully before installation. Growatt shall not be liable for any
damage caused by failure to follow the instructions and safety precautions specified in
this manual.
2.Only professional electricians and mechanical engineers are allowed to perform
operations on the inverter and connect cables.
3.When installing the inverter, do not move other parts inside the chassis other than the
wiring terminals.
4.All electrical installations must comply with local electrical safety standards.
5.For maintenance services, please contact designated professional personnel in the
local area.
6.Before operating the inverter to generate power in grid-tied mode, ensure that you
have obtained approval from the local power grid department.
7.When installing PV modules during the day, use opaque materials to cover the
modules. Failing to do so can result in high voltage at the terminals, posing a risk to
personal safety.
2.2 Qualified personnel
The grid-tied inverter system can only operate properly when correctly connected to the
AC distribution network. Before connecting the MID TL3-XH inverter to the power
distribution grid, you need to obtain approval from the local utility company. Only
qualified and trained technical personnel are allowed to perform the electrical
connection.
Ø Grounding the PV modules: MID TL3-XH inverters are
transformerless, meaning that there is no galvanic separation. Do
not ground the DC side of the MID TL3-XH inverter, but you need
to ground the mounting frame of the PV module. Otherwise, it
will report the error message "PV ISO Low".
Ø Comply with the local requirements when 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.
CAUTION
2.3.2 Electrical Connection Warnings
Ø All electrical connections, such as connecting terminals, the fuse,
PE cables, must be in compliance with the prevailing regulations.
When performing any operations on the inverter while it is
powered on, it is important to adhere to all safety regulations to
minimize the risk of accidents.
Ø Systems with inverters typically need additional control devices
such as switches and disconnects, as well as protective devices
like circuit breakers and fuses. The specific type of control and
protective devices needed will depend on the relevant safety
regulations in effect.
Ÿ Do not open the inverter except the junction box.
Ÿ Only qualified and trained personnel can perform installation,
maintenance and replacement.
Ÿ Live-line work is prohibited.
Ø Danger to life due to high voltages in the inverter.
Ø Persons with limited physical or mental abilities may only work
with the Growatt inverter following proper instruction and under
constant supervision. Ensure that the inverter is inaccessible to
children.
Ÿ High voltage exists after the inverter is powered off. It takes 20
minutes to discharge to the safe voltage.
Ø The components in the inverter are live. Touching live components
can result in serious injury or death.
DANGER
WARNING
5 6
Ø IP66 protection
Ø Lightweight design: 30kg
Ø Easy installation
Ø Support energy storage and backup mode, which requires the installation of a
backup box
Ø Integrated with phase-level export limitation function
Ø Integrated with AC power supply function
Ø Integrated with energy storage one- key detection function
Ø Integrated with AC power supply function to realize the 24h self-consumption
monitoring
Ø Before installation, please check the unit to ensure that there is no
transportation or handling damage, which may affect the
insulation integrity or safety clearances; otherwise, it may cause
safety hazards.
Ø Follow the instructions in this manual to assemble the inverter.
Select a suitable mounting location and comply with the specified
requirements of cooling.
Ø Unauthorized removal of necessary protections, improper use,
incorrect installation and operation may lead to serious safety and
shock hazards and/or equipment damage.
Ø In order to minimize the possibility of shock hazards due to
dangerous voltages, cover the entire solar array with dark-colored
materials before connecting the array to any equipment.
WARNING
2.3.1 Assembly Warnings
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