SMA SI 3324 Errata - Manual (Page 9)

SMA Solar Technology AG Electrical Connection
Installation Guide 9/16 SI3324_4248-E-IEN094410
1.4 AC Connection
Connect the Sunny Island through a sub-distribution to the stand-alone grid (loads, PV generator
(Sunny Boy), wind turbine system (Windy Boy) and to any other external sources (generator, grid)).
1.4.1 Check Connection Requirements
Grounding
Provide the protective conductor with with suitable cable end sleeves and connect to the PE terminals
in the AC connection area of the Sunny Island.
Fusing of the Sub-distribution
Use cables with a maximum cross-section of 16 mm² for the AC installation The AC nominal current
is 14 A for the Sunny Island 3324 and 18 A for the Sunny Island 4248.
TN system
When working with public grids, the Sunny Island may only be installed as a TN system.
In stand-alone configurations, the (protective) ground of the Sunny Island and its individual
components must be wired as a TN system only.
All valid standards and guidelines must be taken into account.
CAUTION!
Risk of injury due to high discharge currents against PE.
The N cable of the Sunny Island has NOT been connected with PE by default.
• Ground the stand-alone grid system on the AC side before commissioning outside of
the Sunny Island.
• For safety reasons (discharge currents exceeding 3.5 mA), use either two protective
conductors (redundant grounding) or a protective conductor of at least 10 mm².
DANGER!
Danger to life due to residual currents.
• Protect all users with a residual current breaker (RCD) or, for the Sunny Island 4248,
protect with a 16 A circuit breaker with B tripping characteristic.
No all-pole isolator
The Sunny Island is not disconnected on all poles: the neutral conductor (N conductor) is
looped through the device and the N connection terminals of "AC output" and "AC input"
are connected inside the device.