Caution
4.3.4 Connecting Inverter To PV Pannel
DEVALAN SERIES MC4 SERIES
AMPHENOL SERIES QC4.10 SERIES
1. Make sure the DC switch is turned off before connecting PV string to the inverter.
2. Make sure PV string polarity confirms with DC connector. Otherwise, it will cause damage to
inverter.
3. Make sure the maximum open circuit voltage (Voc) of each PV string does not exceed the
maximum input voltage of the inverter under any condition(1100V).
4. Make sure that the maximum short circuit current of each DC input is less than the inverter
allowable limit.
5. Do not connect positive or negative pole of PV string to earth (PE terminal). Otherwise, it will
permanently destroy the inverter.
6. Positive cable should be red, negative cable should be black.
7. The minimum insulation resistance to ground of the PV panels must exceed 33.3kΩ (R = 1000/30
mA), there is a risk of shock hazard if the requirement of minimum resistance is not met.
8. The MT series has four PV input area PV1 input, PV2 input, PV3 input, PV4 input, each with MPP
tracker. The four PV input works independently, therefore the four PV input can be different with
each other, including different types of modular, different numbers of connecting PV strings,
different orientation angel of PV modular.
There are four types of DC connectors, DEVALAN, MC4, AMPHENDL H4 and QC4.10 series.
Note: The actual DC connector used is as shown in the accessory box.
DC cable specification:
Value
4~5mm
2.5~4mm
2
About 7mm
Label
A
B
C
Description
External diameter of wire stock
Cross-sectional area of conductor material
Length of bare wire
A
B
C
The output current of GW50KLV-MT / GW50KLV-MT / GW80K-MT is 133A, so we recommend that
the nominal current of the AC breaker should be more than 160A.
Note: It's not allowed for several inverter to use the same circuit breaker. Connecting loads
between the inverter and circuit breaker is not allowed
The internal integrated residual current detection device (RCD)of inverter can detect external
leakage current in real time. When the detected leakage current value exceeds the limit value, the
inverter will be disconnected from the grid immediately. If an external RCD is installed, the action
current should be 500mA or higher.
4.3.3 Earth Terminal Connection
The inverter is equipped with earth terminal according to the requirement of EN 50178.
All non-current carrying exposed metal parts of the equipment and other enclosures in the PV
power system must be grounded.
Please connect "PE" cable to ground.
1. Strip the wire insulation sheet of a suitable length with a wire stripper, illustrated as below.
4. In order to improve the corrosion resistance of the terminal, it is recommended to apply silica
gel on the earth terminal for corrosion protection after the grounding cable assembly is
completed.
2. Insert the stripped wire into the terminal and compress it tightly by crimping pliers.
3. Fix the earth wire on the machine.
B
A
C
NO.
A
B
C
Name
Cold-pressed terminal
Screw
Yellow and green line
Explanation
M8*20
The maximum is 25mm
2
L1
L2=L1 + (1~2mm)
Section area of
PE cable
16mm²
16mm²
S/2
Note
Section area of
AC cable (S)
S > 16mm
2
S ≤ 35mm
2
S > 35mm
2
Only applicable when the material
of PE wire and L wire is the same.
If the material is different, please
select according to the equivalent
resistance of PE wire.
13 14
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