6 Electrical Connection
SMA Solar Technology AG
Operating manual
63
SI44M-80H-13-BE-en-15
7. Ensure that the seal insert is positioned correctly in the cable gland.
8. Tighten the swivel nut of the cable gland (torque: 2.6 Nm).
6.7
Checking the Wiring
Ensure that you carry out all tests relevant to the system and rectify all detected problems. Tip: Tests can be
documented directly in the tables. Cross out all tests not applicable.
Requirement:
☐ All Sunny Island inverters must be disconnected from all voltage sources (see Section 12, page 126).
Checking the Grounding
Test point
Test criterion
Ok
Enclosure opening ExtVtg
Enclosure opening is sealed with a filler plug or M20 cable gland.
☐
The cable diameter of the cable must be 7 mm to 14 mm for an M20
cable gland.
☐
Cable length at the ExtVtg connec-
tion
The cable length must be less than 30 m.
☐
Conductor cross-section of the
grounding conductor at the
AC1
and
AC2
connections
If 1 grounding conductor is connected, the conductor cross-section must
be at least 10 mm². If 2 grounding conductors are connected, the
cross-section of each conductor must be at least 4 mm².
☐
The grounding conductor must be threaded through a ferrite.
☐
Grounding conductor connection to
ground
The grounding conductor must be grounded, e.g., by connection to a
grounding busbar or a foundation ground electrode.
☐
With a TN system, neutral conductor
and grounding conductor connection
Ensure by measuring that there is a conductive connection between the
neutral conductor and the grounding conductor.
☐
Grounding of the battery
Ensure that the battery is not grounded unintentionally.
If the battery has been grounded intentionally, ensure that the conduc-
tor cross-section is sufficient (see Section 6.4, page 34).
☐
Checking the Additional Grounding
If the battery is grounded, you must check the additional grounding on the Sunny Island.
Test point
Test criterion
Ok
Conductor cross-section for the addi-
tional grounding
The conductor cross-section must correspond to the grounding of the
battery.
☐
Connection of additional grounding
Hexagon socket screw is screwed tight (torque: 4 Nm to 5.7 Nm).
☐
Grounding conductor connection to
ground
The grounding conductors must be grounded, e.g., by connection to a
grounding busbar or foundation ground electrode.
☐
Connecting the Sunny Island Inverter
Test point
Test criterion
Ok
Enclosure opening for DC
In the cable gland M32, the diameter of the DC power cable must be
14 mm to 25 mm.
☐
