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Sunny Island
How to wire the components and the Sunny Island for protective
grounding depends on the type of grid installed and can therefore
differ. Therefore the figures below do not show any wiring. Of course
the entire cabling must be installed compliant with all relevant stan-
dards and regulations.
3.4.1 Connection to Ground
Due to filtering measures within the Sunny Island increased leakage currents to PE
can occur during operation. Therefore make sure the inverter is firmly grounded ac-
cording to DIN EN50178.
To this end the inverter can be grounded at the ground terminals in
the terminal area either with one single copper conductor of a mini-
mum 10 mm² cross-section or with two separate copper conductors
with cross-sections corresponding at least to the respective AC con-
ductor.
If the two ground conductors are not part of the AC connection cable
they should have a minimum cross-section of 4 mm² each.
Due to galvanic isolation between the battery and grid side within the Sunny Island it
is basically possible – but not absolutely necessary – to ground the minus or plus
pole of the battery externally. In this case make sure that the very high currents that
can occur for a short time in case of a error are discharged as well.
We cannot make general recommendations for the dimensioning of the required
grounding cable as this considerably depends on the type of battery used, the exter-
nal fused interrupter and the design of the incoming cables of the battery.
If an additional grounding cable with a larger cross-section is required this can be
connected to the M6 threaded hole (marked as such) on the aluminum backplane
(heat sink) of the Sunny Island.
BWRI33-12:EE
Installation & Operating Instructions
- 25 -
SMA Regelsysteme GmbH
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