Connecting the Grounding Conductor with a Grounded Battery
Qualified person
If you ground the battery, you can ground it at the positive terminal or at the negative terminal with a grounding conductor. SMA Solar Technology AG does not recommend grounding the battery. If the battery is grounded, the enclosure of the Sunny Island must also be grounded. This additional grounding is no substitute for the grounding at connections AC1 und AC2.
Cable requirements:
Material: Copper wire
Minimum conductor cross-section: 10 mm² (or 2x 4 mm²)
Maximum conductor cross-section: 16 mm²
The cross-section of the grounding conductor must comply with the locally applicable standards and directives.
The cross-section of the grounding conductor must be sized in accordance with the requirements of the external battery fuse.
The cross-sections of the battery grounding conductor and Sunny Island inverter grounding conductor must be the same.
Procedure:
- Calculate the cross-section of the grounding conductor. Observe all locally applicable standards and directives when doing so.
- Ground the battery at the positive terminal or negative terminal using a conductor with the calculated cross-section.
- Also ground the Sunny Island enclosure using a conductor with the calculated cross-section, as follows. To do this, first strip the insulation from the grounding conductor.
- Place the clamping bracket over the conductor. Position the conductor on the left.
- Fasten the clamping bracket with the M6x16 hexagon socket screw and a serrated conical spring washer (AF 5, torque: 4 Nm to 5.7 Nm). The teeth of the conical spring washer must face the clamping bracket.
