User Manual
Figure 3.24 Multimeter measurement
Figure 3.25 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 ampmeter to measure the DC string current.
*If it is above 0.5A, please wait for the solar irradiance to drop until the
current decreases to below 0.5A.
*Only after the current is below 0.5A, you are allowed to turn off the DC
switch 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 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.
3. Installation
23
● Short circuit current of all strings connected to a single MPPT must not exceed the Max. Short
Circuit rating of MPPT input. (see section 9 “Specifications” for
Max. Short Circuit Current specification) .
Cable type
Outside diameter of
cable（mm）
4.0~6.0
(12~10AWG)
5.5~9.0
Traverse area（mm²）
Range
PV Wire
UL 4703 Listed
Recommended
value
4.0
(12AWG)
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