3. Installation
3. Installation
.23.
.22.
3.4.3 Connect grid side of inverter
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:
WARNING
An over-current protection device must be used between the inverter and
the grid.
NOTE
Use AL-CU transfer (bi-metallic) terminal or
anti-oxidant
grease
with
aluminum
cables
and
terminals.
CSI-125KTL-GS-E
Table 3.2 Rating of grid OCPD
Inverter
Rated
voltage(V)
Rated output
current (Amps)
Current for protection
device (A)
120
600
3.4.3.1 Connecting the inverter to the utility grid
All electrical installations must be carried out in accordance with the local standards and
the National Electrical Code® ANSI/NFPA 70 or the Canadian Electrical Code® CSA C22.1.
The AC and DC electric circuits are isolated from the enclosure. If required by section 250
of the National Electrical Code®, ANSI/NFPA 70, the installer is responsible for grounding
the system.
The grid voltage must be within the permissible range. The exact operating range of the
inverter is specified in Section 9 “Specifications”.
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 9 “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.
3.4.2.2 Recommended fusing section for each channel or connection
Each DC string should be directly connected to the inverter.
The
sizing
of
the
string
fuses
must
take
into
account
the
two
following
conditions
:
1).
The nominal current rating of the selected fuse must not exceed the maximum fuse
rating of the PV panels. Please refer to the applicable specifications for this value.
2).
The fuse rating is determined based on the PV panel string current and on the sizing
guidelines provided by the panel manufacturer or the local electrical code. In addition,
the maximum fuse rating must not exceed the maximum input current of the inverter.
Figure 3.24 Fuse holders
NOTE
The AC output neutral is not bounded to the ground.
The neutral wire is not necessary for the installation.
150(Max 265)
