SMA SC 500CP XT Installation - Manual (Page 25)

☐ The terminal lugs must be designed according to the temperature. Temperature: +95°C
☐ The width of the terminal lugs must exceed the washer diameter. Washer diameter: 32 mm. This will ensure that
the defined torques are effective over the whole surface.
Cable requirements:
☐ No more than two cables must be connected to each DC terminal.
☐ Use copper or aluminum cables only.
☐ Maximum cable cross-section: 400 mm².
Torques of the power connections:
Type of terminal lug Torque
Tin-plated aluminum terminal lug on copper bar 37 Nm
Tin-plated copper terminal lug on copper bar 60 Nm
Tin-plated aluminum or copper terminal lug on aluminum bar 37 Nm
Additionally required mounting material (not included in the scope of delivery):
☐ Clean cloth
☐ Ethanol cleaning agent
Procedure:
1. Disassemble the panels (see Section 7.2.1, page 40).
2. Disassemble the protective covers (see Section 7.2.2, page 41).
3. Prepare the cables for connection (see Section 7.3, page 44).
4. Clean the tin-plated contact surfaces in the connection area with the non-woven abrasive until they have a light
metallic sheen.
5. Clean all contact surfaces in the connection area using a clean cloth and ethanol cleaning agent and do not
touch the contact surfaces after cleaning.
6. Connect the cables in accordance with the circuit diagram. Only use the screws, nuts and washers included in the
scope of delivery and make sure that the screw heads always point forwards.
7. Secure the cables on the cable support rail. This will prevent the cable from being pulled out inadvertently.
8. Mount the protective covers (see Section 7.2.2, page 41).
9. Mount the panels (see Section 7.2.1, page 40).
5.4.2 Connecting the SMB Connection Kit
To connect the Sunny Main Box to the inverter, you need the SMB Connection Kit. You can only connect the SMB
Connection Kit to an inverter with DC fuses. The busbar of the SMB Connection Kit links three inverter DC terminals
and enables the connection of up to four DC cables.
Additionally required mounting material (not included in the scope of delivery):
☐ Clean cloth
☐ Ethanol cleaning agent
Procedure:
1. Disassemble the panels (see Section 7.2.1, page 40).
2. Disassemble the protective covers (see Section 7.2.2, page 41).
5 Installation SMA Solar Technology AG
Operating Manual 25 SCCPXT-IA-E4-en-44