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3. Installation
5. Measure PV voltage of DC input with multimeter, verify DC input cable polarity
(see figure 3.16), 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 3.17)
+
-
Figure 3.16 Multimeter measurement
Traverse area（mm²）
Cable type
Range
4.0~6.0
Industry generic PV cable
（model:PV1-F）
(12~10AWG)
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 as it will damage
the inverter and even leads 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.
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.
● 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.
.18.
Figure 3.17 Connect the DC
Connectors to the Inverter
Outside diameter of
Recommended
cable（mm）
value
4.0
5.5~9.0
(12AWG)
3.4.2.1 DC connection high voltage danger notice
CAUTION
RISK OF ELECTRIC SHOCK
Do not touch an energized DC conductor. There are high voltages present when PV modules
are exposed to light causing a risk of death due to an electric shock from touching a DC
conductor!
Only connect the DC cables from the PV module to the inverter as described in this manual.
CAUTION
POTENTIAL DAMAGE TO THE INVERTER DUE TO OVERVOLTAGE
The DC input voltage of the PV modules must not exceed the maximum rating of the inverter.
(see section 10 "Specifications")
Check the polarity and the open-circuit voltage of the PV strings before connecting the DC
cables to the inverter.
Confirm proper string length and voltage range before connecting DC cable to the inverter.
3.4.3 Connect grid side of inverter
WARNING
An over-current protection device must be used between the inverter and
the grid.
1). Connect the three (3) AC conductors to the three (3) AC terminals marked "L1", "L2" and
"L3".Refer to local code and voltage drop tables to determine the appropriate wire size
and type.
2). Connect the grounding conductor to the terminal marked "PE" (protective earth, the
ground terminal).
Over-Current Protection Device (OCPD) for the AC side
To protect the inverter's AC connection line, we recommend installing a device for protection
against over-current and leakage, with the following characteristics noted in Table 3.2
(The OCPD shall comply with IEC/EN60947-3):
NOTE
Use AL-CU transfer (bi-metallic) terminal or anti-oxidant grease with
aluminum cables and terminals.
3. Installation
.19.
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