Three-phase Grid-tied Solar Inverter Electrical connection
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5.3 Connection of photovoltaic string
Step 1: Connect the outlet line of the PV panel to the MC4 terminal delivered by the machine
The MC4 terminal crimping method is as follows:
(1) As shown in Fig 5.2, connect the output wire of the PV string to the DC connector of the inverter.
Loosen the fastening nut of the connector; strip off the 15mm insulation layer of the DC cable, and use
crimping pliers to press the standard metal terminal tightly. The tightening torque of the waterproof part at
the tail is 2.5-3Nm. The wiring method of the positive and negative connectors is the same. Confirm that
the positive and negative poles of the PV string correspond correctly to the positive and negative
connectors ,then connect them firmly;
Fig 5.2 Connection between MC4 DC connector and PV string
（2）After the DC connector is connected, use a multi-meter to measure the voltage of the DC input
string, verify the polarity of the DC input cable, and ensure that the voltage of each string is within the
allowable range of the inverter, as shown in Fig 5.3.
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