4.3.4 DC side connection
1. Before connecting the PV strings, please ensure the plug connectors have the correct polarity.
Incorrect polarity could permanently damage the unit
2. The open circuit voltage of the PV strings cannot exceed the maximum input voltage of the
inverter.
3. Only DC connectors provided by the manufacturer are permitted for use.
4. The positive and negative pole is forbidden from connecting to the PE wire (Ground wire),
otherwise, it will damage the unit.
5. Don't connect positive or negative pole of PV string to PE wire. Otherwise it will cause damage
to inverter.
6. Positive wire shall be red, negative wire shall be black.
7. The minimum insulation resistance to ground of the PV panels for DNS series must exceed 19.3K
ohms (R = 58-/30 mA) , there is a risk of shock hazard if the requirement of minimum resistance
is not met.
There are four types of DC connectors, DEVALAN, MC4, AMPHENDL H4 and QC4.10 series
AMPHENOL SERIES QC4.10 SERIES
DEVALAN SERIES MC4 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
Note: DC Cable should be use dedicated PV cable.
The installation method of DC connector.
NO.
A
B
C
Name
Cold-pressed terminal
Screw
Yellow and green line
Explanation
M5*14
4mm
2
/ 10AWG
Step 3
Fix the earth wire on the machine.
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.
A
B
C
Please use special tools to do crimping
MC4 & QC4.10 DEVALAN & AMPHENOL
Do not crimp wire
into the limit buckle.
Negative connector
Positive connector
Inverter side
11 12
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