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Identificazione: MD-AL-GI-00
Rev. 4.0 del 31.01.18 - Applicazione: GID
Manual of 07/06/2019 Rev. 1.1 “User Manual for 20K-33KTL”
4.3.
Connecting the DC input power cables
Connect the 20-33K TL inverter to the photovoltaic strings using DC input power cables.
Select the input mode: the 20-33K TL inverter has two MPPTs, which can function either independently or in
parallel, depending on how the system was designed. The user can choose the appropriate MPPT operating
mode.
Independent mode (default):
If the strings are independent (e.g. installed on two separate flaps), the input model must be set to
“independent mode.”
The setting method is described in section 6.3.
Parallel mode:
If the strings are connected in parallel, the input mode must be set to “parallel mode.”
The setting method is described in section 6.3.
Note
Depending on the type of inverter, select the appropriate accessories (cables, fuse holder, fuse, switch, etc).
The open-circuit voltage of the photovoltaic system must be lower than the maximum allowable DC input
voltage of the inverter.
Model
20 KTL
25 KTL
30 KTL
33 KTL
Voltage range per MPPT
230-960 V DC
230-960 V DC
230-960 V DC
230-960 V DC
Maximum input voltage
1000 V DC
The positive and negative poles of the panels on the inverter must be connected separately. The power cable
must be suitable for photovoltaic applications.
Note
Both MPPT inputs of the inverter should be populated, even if the system only has one string. If the strings
are arranged in parallel, it is recommended to use a Y or T connection cable to double the input currents
from the PV field and to populate both MPPT inputs of the inverter, as shown in the figure. If the string
arrangement is independent, simply connect the two strings to the two MPPTs of the inverter.
Figure 21 – Y-branch connection cable for solar panels
