6 Electrical Connection
SMA Solar Technology AG
Operating manual
SI44M-80H-13-BE-en-15
64
Test point
Test criterion
Ok
DC connection
Terminal lugs are pressed on firmly.
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The bolted connection for fitting terminal lugs to the DC connection is
assembled as follows: head of M8x20 screw | conical spring washer
| fender washer | terminal lug | DC connection.
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Terminal lugs are firmly fastened on the Sunny Island (torque: 12 Nm).
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DC power cable
The maximum length of the cables from the battery via the battery fuse
to the Sunny Island is 10 m.
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The conductor cross-section meets the cable requirements of 50 mm²
to 95 mm² (for the recommended conductor cross-section, see Sec-
tion 7.4.1).
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Battery fuse
Fuse links are matched to the Sunny Island.
• SI4.4M-13: 100 A
• SI6.0H-13: 160 A
• SI8.0H-13: 200 A
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The cable glands connected to the battery fuse are tightened with the
specified torque (see manufacturer documentation).
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If installed, battery current sensor
The battery current sensor can be loaded with the maximum DC cur-
rent (see technical data of the battery current sensor).
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Checking Connections AC1 and AC2 of the Sunny Island Inverter
Test point
Test criterion
Ok
Enclosure openings AC1 and AC2
All enclosure openings are sealed with M25 cable glands or filler
plugs.
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For an M25 cable gland, the cable diameter must be 9 mm to 18 mm.
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AC1 and AC2 terminals
All contact areas are not insulated.
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All terminal levers are in the downward position.
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All cables are securely clamped.
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AC power cable at connection AC1
The cables are sufficiently protected by circuit breakers.
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Trip-capable circuit breakers are installed and additional type A resid-
ual-current devices have been installed.
Maximum trip-capable circuit breakers:
• SI4.4M-13: Tripping characteristics B6
• SI6.0H-13: Tripping characteristics B16 or C6
• SI8.0H-13: Tripping characteristics B16 or C6
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With a three-phase system, allocation
of the Sunny Island inverters
The allocation of the Sunny Island inverters to the line conductors of
the stand-alone grid or the Multicluster-Box results in a right-hand rotat-
ing magnetic field. The master must be assigned to L1, slave 1 must be
assigned to L2, slave 2 must be assigned to L3.
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