3. Installation
3. Installation
.21.
.20.
Figure 3.22 Multimeter measurement
Figure 3.23 Connect the DC
Connectors to the Inverter
Figure 3.20 Crimp the contact pin to the wire
Figure 3.21 Connector with Cap nut Screwed on
Crimping plier
+
-
Please use appropriate DC cable for PV system.
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.
(see Figure 3.18)
3. Crimp the contact pin to the wire using a proper wire crimper. (see Figure 3.20)
2. Insert the wire into the connector cap nut and contact pin. (see Figure 3.19)
4. Insert metal connector into top of connector, and tighten nut with torque 2.2-3 ft-lbs
(see figure 3.21).
3.4.2 Connect PV side of inverter
Please see table 3.1 for acceptable wire size for DC connections.Wire must be copper only.
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.
Maximum 1500Vdc
for
CSI-125KTL-GS-E
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
Requirements for the PV modules per MPPT input:
● All PV modules must be of the same type and power rating.
● 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 9 “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.
Caution:
If DC positive and negative connections are accidentally reversed (reverse
polarity) or inverter is not powering on, DO NOT turn off the DC switch as it
may damage the inverter or cause a fire.
The correct actions are:
*Use a clip-on ammeter to measure the DC string current.
*If it is above 0.5A, please wait until the current decreases to below 0.5A
(sunset). String current above 0.5A is considered as under load.
*Only after the current is below 0.5A, you are allowed to turn off the DC switch
and disconnect the PV strings.
Note: Damage due to wrong connections or fire caused by removing string
wires or opening fuse holders under load is not covered in the device warranty.