6 Electrical Connection SMA Solar Technology AG
40 SI80H-60H-OffGrid-IA-en-11 Installation Manual
6.8 Connecting PE
You can connect PE to the AC1 Loads/SunnyBoys PE and AC2 Gen/Grid PE terminals. You are
free to decide which terminal you connect the protective conductor to.
If you install PE separately, connect PE as follows:
Cable requirements:
☐ Conductor cross-section: 10 mm² … 16 mm²
☐ Core cross-section: 7 mm … 14 mm
1. Move the lever of the AC1 Loads/SunnyBoys PE terminals upward.
2. Attach the M20 cable gland to the PE enclosure opening with the counter nut.
3. Strip 13 mm of insulation off the PE.
4. Lead the cable through the cable gland into the off-grid inverter.
5. Insert the PE into the AC1 Loads/SunnyBoys PE terminal as far as it will go and move the
lever downward.
6. Tighten the swivel nut of the cable gland.
6.9 Connecting the Stand-Alone Grid/Multicluster Box
Connect the AC loads and the grid-parallel AC sources (e.g. PV inverter) to the AC1 terminal of the
off-grid inverter via an AC sub-distribution. In the case of a multicluster system, the Multicluster Box is
the distribution board that is connected to the AC1 terminal. The AC1 terminal is single-phase.
AC connection with three-core cables
To connect the stand-alone grid and the external energy source, you can use three-core cables
and install PE together with the corresponding N and L (see Section 6.9 and 6.10). You can
use both terminals for PE in parallel. In addition to meeting the cable requirements for the AC1
and AC2 terminals, the protective conductor in each cable must also meet the following
requirements:
• Conductor cross-section for earthing with one protective conductor: at least 10 mm²
• Conductor cross-section for earthing with two protective conductors: at least 4 mm²
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