Connecting The Dc Cables - SMA COMMERCIAL STORAGE SOLUTION 30 System Manual

8 Electrical Connection
8.6.6

Connecting the DC Cables

Damage to the product due to ground fault on DC side during operation
Due to the transformerless topology of the product, the occurrence of ground faults on DC side during operation
can lead to irreparable damage. Damages to the product due to a faulty or damaged DC installation are not
covered by warranty. The product is equipped with a protective device that checks whether a ground fault is
present during the starting sequence. The product is not protected during operation.
• Ensure that the DC installation is carried out correctly and no ground fault occurs during operation.
Requirements:
☐ An external DC load-break switch must be installed (e.g. an integrated DC load-break switch in the battery
cabinet).
☐ The batteries must be protected at all poles.
☐ The DC cables must be inserted into the product.
Additionally required material (not included in the scope of delivery):
☐ Clean cloth
☐ Ethanol cleaning agent
☐ Press tool
Procedure:
1. Ensure that no voltage is present on the DC cables.
2. Dismantle the DC cables.
3. Pull the supplied blue heat-shrink tubing onto the DC- cable. The heat-shrink tubing must be below the stripped
conductor section.
4. Pull the supplied red heat-shrink tubing onto the DC+ cable. The heat-shrink tubing must be below the stripped
conductor section.
5. Fit terminal lugs to the DC conductors.
6. Pull the heat-shrink tubings onto the crimped section of the terminal lugs and using a hot-air blower shrink them so
that they are in firm contact with the terminal lugs.
7. Remove any cable remnants from the product.
8. Remove the fixing of the pre-harnessed DC cables from the product.
9. Clean the contact surfaces of all terminal lugs using a clean cloth and ethanol cleaning agent and do not touch
the contact surfaces after cleaning.
74 ESSX-20-SH-en-10
NOTICE
SMA Solar Technology AG
System Manual