SMA SI-TB-BOX-10 - Manual (Page 36)

6 Electrical Connection SMA America, LLC
36 SI_TDBOX-IA-eng-IUS122211 Installation Manual
6.3 Selecting Cables
Cable requirements:
☐ Conductor material: copper
☐ Conductor structure: solid wire, coarse stranded wire, or fine stranded wire
☐ The cable must be approved for 167°F (75°C).
☐ Maximum wire size: 4 AWG
Minimum wire sizes
• Make sure that the general cable requirements are adhered to.
• Make sure that minimum and maximum wire sizes are adhered to.
If you connect a Sunny Island 5048-US without labeling "Smartformer compatible" on the original
packaging, observe the following procedure:
• Select a wire size of 6 AWG for the AC 1 connection cable of the Sunny Island.
• Fuse the AC 1 connection cable of the Sunny Island outside of the Smartformer. Use a 60 A
miniature circuit-breaker, for example.
• In order to avoid excessive tripping of the 60 A miniature circuit-breaker, limit the rated power
of the loads to 5.8 kW.
Components for connection Minimum wire size
Loads 6 AWG
PV plant with miniature circuit-breaker 25 A 10 AWG
PV plant with miniature circuit-breaker 50 A 6 AWG
Generator or power distribution grid 6 AWG
Sunny Island: AC 1 terminal 4 AWG*
* Valid for Sunny Island 4548-US / 6048-US and for Sunny Island 5048-US with labeling "Smartformer compatible" on the
original packaging
Sunny Island: AC 2 terminal 6 AWG