6 Electrical Connection SMA Solar Technology AG
42 SI80H-60H-OffGrid-IA-en-11 Installation Manual
• For a single-phase parallel single-cluster system, the cable length and the conductor cross-
section must be identical from every off-grid inverter to the AC sub-distribution. This will allow for
stable and symmetric operation.
Cable requirements:
☐ Conductor cross-section: max. 16 mm²
☐ Conductor cross-section for a three-core cable and earthing with one protective conductor:
10 mm² ... 16 mm²
☐ Conductor cross-section for a three-core cable and earthing with two protective conductors:
4 mm² ... 16 mm²
☐ Core cross-section: 9 mm ... 18 mm
Requirements:
☐ For a three-phase system, L1 must be assigned to the master, L2 to slave 1 and L3 to slave 2.
This creates a right-hand rotating magnetic field.
☐ The power of the AC sources in the stand-alone grid must be less than the maximum connectable
power of the AC sources in the stand-alone grid (see Section 12"Technical Data",page144).
The powers of the individual off-grid inverters in a cluster are added to yield the total maximum
power.
1. Move the levers of the AC1 terminal upward.
2. Attach the M25 cable gland to the AC1 enclosure opening using the counter nut.
3. Remove the cable jacket and strip 13 mm of insulation from all wires.
4. Lead the cable through the cable gland into the off-grid inverter.
5. Connect the wires to the AC1 Loads/SunnyBoys terminals:
•Insert N into the N terminal as far as it will go and move the lever downward.
• Insert L into the L terminal as far as it will go and move the lever downward.
• In the case of a three-core cable, insert the PE into the PE terminal as far as it will go and
move the lever downward.
6. Tighten the swivel nut of the cable gland.
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