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Identification: MD-AL-GI-00
Rev. 4.0 of 31.01.18 - Application: GID
Manual of 07/06/2019 Rev. 2.1 “User Manual for 1.1K-3K TL”
4.3.
Connecting the DC input power cables
Connect the 1.1K-3K TL inverter to the photovoltaic strings using DC input power cables.
Note
Depending on the type of inverter, select the appropriate inverter accessories (cables, fuse holder, fuse,
switch, etc). The inverter associated with the PV array must offer excellent performance and reliable quality.
The open-circuit voltage of the photovoltaic system must be lower than the maximum DC input voltage of
the inverter. The output voltage of the strings must be compatible with the MPPT voltage range.
The positive and negative poles of the panel on the inverter must be connected separately. The power cable
must be suitable for photovoltaic applications.
Make sure that the following information is observed. Otherwise, there is a risk of
fire.
The modules connected in series in each string must have the same
specifications.
The open-circuit voltage for each string must be less than 1000 VDC.
The output power for each PV string must be less than or equal to the
maximum input power allowable for 1.1K-3K TL inverters.
The positive and negative terminals of the PV strings must be connected
respectively to the positive and negative inputs of the input terminal block.
Attention
Before connecting the power supply, be sure to disconnect the generator’s
DC switch. When exposed to the sun, the photovoltaic generator produces a
voltage that can be dangerous!
Before connecting the power supply, make sure that the voltage of the DC
cables is within the permissible operating range and that the DC circuit
breaker switch is open. Otherwise, the high voltage may cause serious
damage.
Danger
Check the polarity of the PV string to ensure the correct connection of the cables
to the string.
Be sure not to connect the positive or negative pole of the PV string to the
ground.
Note
Cross-sectional area (mm
2
)
Outer diameter of cable (mm)
Range
Recommended value
4.0-6.0
4.0
4. 5 - 7. 8
Table 1 – Recommended specifications for DC input cables
The DC input connectors (MC4) are classified into positive and negative connectors, as shown in the figures
below.