Requirements for the DC Connection

Fusing the DC terminals:

Each DC terminal is designed for a maximum charging/discharging current of 10 A. The conditional short-circuit current-carrying capacity of all DC inputs is 40 A.

As of firmware version 3.11.03.R, the inverter is equipped with a monitoring function of the DC input current. If the 40 A is exceeded, the battery is automatically disconnected for protection and the inverter goes into permanent operation inhibition. For batteries approved by SMA Solar Technology AG, even those with an output current > 40 A, additional fusing between the battery and the inverter is not mandatory. If additional protection is required by local laws, regulations or standards, it must be installed. Local regulations must be checked and complied with.

Cable requirements:

  • Conductor cross-section: 2.5 mm² to 10 mm²

  • Insulation stripping length: 12 mm

  • The conductors must consist of copper.

  • The conductors must be made of solid wire, stranded wire or fine stranded wire. When using fine stranded wire, bootlace ferrules must be used.

  • Maximum cable length: 10 m

    Connection of a battery with a charging/discharging current limit of 30 A
    Connecting the power cable of the battery