5.4.4
Grounding
AC Grounding
The TL3-S series inverter must be connected to the AC grounding conductor of the
power distribution grid via the ground terminal (PE).
PV Grounding
The grounding conductor in the framework of the PV array must be connected to the
PV grounding conductor and the DC grounding conductor. The cross-section of the
grounding conductor corresponds to the cross-section of the largest conductor in the
DC system.
DC Grounding Conductor
A DC grounding conductor may be required by the Authority Having Jurisdiction
(AHJ). Use the terminal block for the PV grounding conductor and DC grounding
conductor.
5 In order to seal the inverter, all unneeded DC inputs must be closed with sealing
plugs:
Cable requirements:
Model
Diameter(mm)
Area(mm²)
AWG
7000-15000TL3-S
1.63-2.05
2.5-4
14-12
3 Check the assembled DC connectors for correct polarity and connect them to the
inverter.
4 The maximum string currents are varying from different inverter types.
Model
Max.current
7000TL3-S
8000-9000TL3-S
10000-11000TL3-S
12000TL3
12000-15000TL3-S
11.5A/11.5A
11.5A/11.5A
13A/13A
11.5A/11.5A
20A/10A
Ground kit
If PV modules of the PV system require POSITIVE or NEGATIVE to connect to
GROUND, the output of inverter should connect to grid with an isolating
transformer. The connection method is below:
N of transformer should not be connected to PE.
Inverter
L1
L2
L3
N
PE
5.5 Grid Type
5.5.1 Common grid type
Based on the local GRID standards, it may select different connection types. In the
following you will find an overview of the most common type of grid structure.
Transformer
L1
L2
L3
PEN
PE
TL3
TN-C
Transformer
L1
L2
L3
N
PE
TL3
TN-S
Transformer
L1
L2
L3
N
PE
TL3
TN-C-S
Transformer
L1
L2
L3
N
PE
TL3
TT
Transformer
L1
L2
L3
PE
TL3
IT
5.5.2 Compatibility Table
Grid type
TN-C grid
TN-S grid TN-C-S grid
TT grid
IT grid
Grid type
8000-11000TL3-S
yes
(N and PE of inverter both
should connect to PEN of grid.)
yes
yes
yes,
if UN-PE < 30V
yes,
if UN-PE < 30V
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