15
16
6.3 DC side wiring
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Ø
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When the sun shines on the panel, voltage will be generated.
The high voltage after the connection may cause life-threatening.
Therefore, before connecting the DC input line, the panel should be
shielded with opaque material before operation, and the inverter is
ensured. The DC switch of the unit is in the "OFF" state, otherwise
the high voltage of the inverter may be life-threatening.
To avoid electric shock, do not touch the live parts and carefully
connect the terminals.
Make sure the AC switch is disconnected before wiring.
Please ensure that the following conditions are met, otherwise it may
cause fire hazard or damage to the inverter. In this case, the company
does not carry out warranty and assumes any responsibility.
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The maximum open circuit voltage of each string of PV modules
shall not exceed 1100Vdc under any conditions.
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The PV modules connected in series in the PV string are all of
the same specification type.
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The maximum short-circuit current of each PV string shall not
exceed 25A under any conditions.
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The total output power of all PV strings must not exceed the
maximum input power of the inverter.
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In order to optimize the system configuration, it is
recommended to connect the same number of PV modules with two
inputs.
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If the inverter output is directly connected to the grid (ie the
output side is not connected to the low frequency isolation
transformer), make sure that the PV string is not grounded.
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If the inverter is for a specific model of the thin-film battery
pack (PV-ground), please turn on the low-frequency isolation
transformer after the output is connected, otherwise the inverter will
be damaged.
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If it is measured that there is a stable non-zero DC voltage
between the positive pole and the ground of the PV string, it
indicates that an insulation fault has occurred at a certain position in
the PV string, and it is necessary to ensure that the fault is repaired
before continuing the wiring.
Moisture and dust penetration can damage the inverter.
Make sure the cable connector is securely tightened.
If the cable connector is not installed correctly, the inverter may
be damaged by moisture and dust. All warranty claims are invalid.
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Danger
Warning
Note
The MID series inverter has two independent inputs, as shown below:
fig6
.
5
PV terminal
A
C
Note: MID 25KTL3-X model MPPt2 is 3 sets of PV input.
The selection of PV modules should pay attention to the following points:
The PV modules of each PV string are of the same specification.
The PV modules of each PV string are connected in series by the same number.
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Ø
Ø
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Before connecting the panel, please make sure that the DC input
polarity is correct, that is, the positive pole of the PV module is connected
to the DC input terminal of the inverter marked “+”, and the negative pole
is connected to the DC input terminal marked “-”.
The maximum DC input current and voltage of the inverter must not
exceed the following limits:
Model
Single maximum input
current
Maximum input voltage
MID 6-12KTL3-XL
25A
1100V
MID 10-22KTL3-X
25A
1100V
MID 25KTL3-X
25A/37.5A
1100V
Note
Connecting DC terminal:
Cables
Cables
Positive
metal
terminal
Positive
connector
Negative
connector
Negative
metal
terminal
4~6mm²
4~6mm²
fig6
.
6 Quick installation instructions
