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SMA Solar Technology AG 6 Electrical Connection
Installation Manual SI80H-60H-OffGrid-IA-en-11 43
6.10 Connecting an External Energy Source
If you are installing an external energy source, connect the generator or the electricity grid to the AC2
terminal of the off-grid inverter. The AC2 terminal is single-phase. For a multicluster system, connect
the external energy source directly to the Multicluster Box (see the Multicluster Box installation
manual).
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
☐ A cable must be laid from the AC sub-distribution or the external energy source for each off-grid
inverter.
☐ For a single-phase parallel system, the cable length and the conductor cross-section must be
identical between each off-grid inverter and the sub-distribution or external energy source.
☐ For a three-phase system, L1 must be assigned to the master, L2 to slave 1 and L3 to slave 2.
1. Move the levers of the AC2 terminals upward.
2. Attach the M25 cable gland to the AC2 enclosure opening with 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.
Requirements for operation on the electricity grid
The off-grid inverter does not meet the requirements for operation on the electricity grid in many
countries.
• Ensure that the local standards and requirements are met.
Combination of electricity grid and generator
You can implement a combination of the electricity grid and a generator as an energy reserve.
The generator and electricity grid cannot feed electricity into the off-grid system at the same
time. An external automatic transfer switch is required in order to use a generator and the
electricity grid (see Section 6.28"Connecting the Auxiliary Contact of the Transfer
Switch",page66).
• Connect external energy source to the transfer switch.
• Connect the transfer switch to the AC2 terminal as external energy source.