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Installation and Operation Manual M125HV EU V3 EN 2021-07-12
5 Planning the installation
Planning the grid connection (AC)
5.5
Planning the connection of the solar
modules (DC)
Further information
“6.7 Connect the mains (AC) and solar modules (DC)”,
page 73
5.5.1 Safety instructions
DANGER
Electric shock
Potentially fatal voltages are present at the DC
connections of the inverter. When light falls on
the solar modules, they immediately start to
generate electricity. This also happens when
light does not fall directly on the solar modules.
►
Never disconnect the inverter from the solar
modules when it is under load.
►
Turn both DC isolating switches to the
OFF
position.
►
Disconnect the connection to the grid so that
the inverter cannot feed energy into the grid.
►
Disconnect the inverter from all AC and DC
voltage sources. Make sure that none of the
connections can be restored accidentally.
►
Ensure that the DC cables cannot be
touched accidentally.
NOTICE
Incorrectly dimensioned solar system.
If the solar system is dimensioned incorrectly,
this may damage the inverter.
► Always take the technical specifications of
the inverter (input voltage range, maximum
current and maximum input power) into ac-
count when calculating the number of solar
modules.
NOTICE
Overheating of the DC connections.
Exceeding the maximum current can cause the
DC connections to overheat and catch fire.
►
Always take the maximum current of the DC
connections into account when planning the
installation.
NOTICE
Ingress of moisture.
Moisture can enter via open DC connections.
►
To ensure protection degree IP65, close un-
used DC connections with the rubber plugs
that are attached to the DC connections.
►
Before connecting the solar modules, turn both DC isolating
switches to the
OFF
position.
Turn DC isolating switches 1 and 2 to the OFF position
5.5.2 Special tools required
Mounting tool for disconnecting the DC
plug and the protective caps from the DC
connections. Included in scope of delivery.
Amphenol part number: UTXTWA001.
5.5.3 Polarity of the DC voltage
►
Check the polarity of the DC voltage of the DC strings be-
fore connecting the solar modules.
