3. Installation
3. Installation
.21.
.20.
3.4.2 Connect PV side of inverter
WARNING
DO NOT connect the PV array positive or PV array negative cable to ground.
This can cause serious damage to the inverter!
WARNING
MAKE SURE the polarity of the PV array output conductors matches
the DC- and DC+ terminal labels before connecting these conductors
to the terminals of the inverter.
WARNING
Before connecting the inverter, make sure the PV array open circuit
voltage is within the limit of the inverter. Otherwise, the inverter could
be damaged.
WARNING
Please use the original DC MC4 terminals, otherwise the unqualified
DC connectors
may cause damages to the inverter.
Figure 3.20 Crimp the contact pin to the wire
Figure 3.21 Connector with Cap nut Screwed on
The steps to assemble the DC connectors are listed as follows:
1. Strip off the DC wire for about 7mm, Disassemble the connector cap nut.
3. Crimp the contact pin to the wire using a proper wire crimper.
2. Insert the wire into the connector cap nut and contact pin.
4. Insert metal connector into top of connector, and tighten nut with torque 3-4 Nm.
Please see table 3.1 for acceptable wire size for DC connections.Wire must be copper only.
5. Measure PV voltage of DC input with multimeter, verify DC input cable polarity
(see figure 3.22), and ensure each string voltage is in range of inverter operation.
Connect DC connector with inverter until hearing a slight clicking sound indicating
successful connection. (see figure 3.23)
Figure 3.18 Disassemble the Connector Cap nut
Figure 3.19 Insert the Wire into the
Connector Cap nut and contact pin
Crimping plier
Figure 3.22 Multimeter measurement
Figure 3.23 Connect the DC
Connectors to the Inverter
+
-
Caution:
If DC inputs are accidently reversely connected or inverter is faulty or not
working properly, it is NOT allowed to turn off the DC switch. Otherwise it may
cause DC arc and damage the inverter or even lead to a fire disaster.
The correct actions are:
*Use a clip-on ammeter to measure the DC string current.
*If it is above 0.5A, please wait for the solar irradiance reduces until the
current decreases to below 0.5A.
*Only after the current is below 0.5A, you are allowed to turn off the DC
switches and disconnect the PV strings.
*
In order to completely eliminate the possibility of failure, please disconnect
the PV strings after turning off the DC switch to aviod secondary failures due
to continuous PV energy on the next day.
Please note that any damages due to wrong operations are not covered in
the device warranty.
Requirements for the PV modules per MPPT input:
● All PV modules must be of the same type and power rating.
● Please ensure the PV strings are evenly connected to the inverter and try to utilize all the
MPPT trackers.
● All PV modules must be aligned and tilted identically.
● The open-circuit voltage of the PV array must never exceed the maximum input voltage of
the inverter, even at the coldest expected temperature. (see section 10 “Specifications” for
input current and voltage requirements)
● Each string connected to a single MPPT must consist of the same number of series-
connected PV modules.
