an external junction box close to the inverter to make this section change is recommended.
5.3.6.1 Protection of the connection to the Electricity Grid
It is necessary to install protection elements in the connection between the inverter and the Electricity Grid.
Thermomagnetic circuit breaker
A thermomagnetic circuit breaker and/or fuse needs to be installed in the connection from the inverter to the Elec-
tricity Grid.
The following table provides the necessary data for the selection of these devices by the installer. All data in Am-
peres.
Ingecon Sun
Maximum inverter
current
Nominal current
of type gL/ ther-
momagnetic fuse
Type B
10 TL
17
25
12.5 TL
24.2
32
15 TL
25.5
32
18 TL
26.2
32
When selecting the protection in an installation, it must be borne in mind that its circuit breaking capacity needs to
be higher than the grid connection point’s short-circuit current.
It must be taken into account for correct selection of the protection that the ambient working temperature influences
the maximum current permitted by these protections as indicated by the manufacturer.
Differential switch
Never install in the grid connection for SMART TL units (without a transformer) a differential switch with a limit cur-
rent below the maximum fault current which may occur in the PV installation under all its operating conditions.
The ground capacitance of the PV modules varies depending on the manufacturing technology (e.g. thin layer
modules with cells on metal support).
The PV modules used with the INGECON SUN SMART TL unit must have a coupling capacitance of less than 50
nF/kWp.
During feeding to the grid, a shunt current is produced from the cells to ground the value of which depends on the
type of module assembly and also varies with atmospheric conditions (rain, snow).
This service-conditioned shunt current must not exceed the breaking current value of the differential switch. If it
does so, the connection of the inverter to the grid may trip the differential switch external to the inverter.
The unit will need to be started up manually, as the ON / OFF status is conserved even though the apparatus is
disconnected.
The section on ‘Display control’ explains how to connect it.
Installation Manual
INGECON
®
SUN SMART TL
AAY2000IKI03
AAY2000IKI03
Rev. _
Date: March 2011
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