SMA SUNNY BOY 1.5 - Connecting Additional Grounding

11. Plug the connecting terminal plate with the
connected conductors for the AC connection into
the slot in the inverter until the connecting
terminal plate clicks into place.
12. Ensure that the connecting terminal plate is securely in place by slightly pulling it.
6.3.3 Connecting Additional Grounding
If additional grounding or equipotential bonding is required locally, you can connect additional
grounding to the inverter. This prevents touch current if the grounding conductor at the terminal for
the AC cable fails.
The required clamping bracket, the cylindrical screw M5x16, the washer and the spring lock
washer are part of the scope of delivery of the inverter.
Cable requirements:
Use of fine-stranded conductors
You can use an inflexible or a flexible, fine-stranded conductor.
• When using a fine-stranded conductor, it has to be double crimped by a ring terminal lug.
Make sure that no insulated conductor is visible when pulling or bending. This will ensure
sufficient strain relief by means of the ring terminal lug.
☐ Grounding cable cross-section: max. 10mm²
Procedure:
1. Strip off 12mm of the grounding cable insulation.
2. Insert the screw through the spring lock washer, the clamping bracket and the washer.
3. Lightly screw the screw into the thread of the connection point for the additional grounding.
4. Lead the grounding cable between the washer
and clamping bracket and tighten the screw
(torque: 6Nm) using a Torx screwdriver (TX25).
6 Electrical Connection
SMA Solar Technology AG
Operating Manual 29SB15-25-1VL-40-BE-en-11