7
CAUTION
DANGER
WARNING
8
2.5 Electrical Connection Warnings
Grounding the PV modules
：
The Growatt MTL- is a
transformerless inverter. That is why it has no galvanic
separation. Do not ground the DC circuits of the PV
modules connected to the Growatt MTL- . Only ground the
mounting frame of the PV modules.If you connect
grounded PV modules to the Growatt MTL- , 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.
S
S
S
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 20 minutes to discharge
Wait 20 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 Growatt
inverter away from children.
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.
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:
CAUTION
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
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.
2.6 Operation Warnings
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.
House
grid:
Public
grid:
WARNING
CAUTION
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.
