Connecting CAN communication cable

Qualified person

Connect the communication cable of each battery and, in battery-backup systems, the communication cable of the automatic transfer switch as described in the following.

Communication between Inverter and Battery

  1. Communication between the inverter and the battery takes place via the battery communication cable via CAN bus.

Additionally required material (not included in the scope of delivery):

  • One battery communication cable for the communication between inverter and battery

  • In battery-backup systems with automatic transfer switch: one communication cable between inverter and automatic transfer switch

Network cable (SBS to switch, battery to switch) requirements:

  • Twisted pair conductors

  • Cable category: minimum CAT5e

  • Shielding: yes

  • Conductor cross-section: 0.25 mm² to 0.34 mm²

  • Recommended number of conductor pairs: 4

  • External diameter: 6 mm to 8.5 mm

  • Maximum cable length between battery and inverter and, in battery-backup systems, between automatic transfer switch and inverter: 10 m

  • The cable has to be insulated for 600 V.

  • UV-resistant for outdoor use.

  • Comply with the requirements of the battery manufacturer.

Assignment of the terminal block:

Terminal block




Not assigned










+12V supply for automatic transfer switching device


  1. Remove the sealing plugs from the network connection opening on the inverter.
  2. Insert the cable gland into the opening and tighten it with the counter nut from the inside.
  3. Lead the communication cable into the inverter.
  4. Strip the communication cable 50 mm.
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  6. Trim the cable shield to a length of 15 mm and fold it over the cable sheath.
  7. Strip the insulation on the insulated conductors each by 6 mm. The CAN L and CAN H must be a twisted pair.
  8. If necessary, trim unused insulated conductors flush with the cable sheath or fold it over the cable sheath.
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  10. Connect the conductors of the communication cables to a 6-pole terminal block. Pay attention to the assignment of the terminal block and communication connection on the battery and/or automatic transfer switch and make sure that CAN L and CAN H consist of a pair of conductors.
  11. Make sure that the conductors are plugged into the terminal points tightly by pulling slightly on the conductors.
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  13. Insert the terminal block for the communication connection into the jack BATx on the battery interface module. If only one battery is available, insert the plug into the jack BAT1. If multiple batteries and/or an automatic transfer switch are available, insert the communication connection of the first battery into the jack BAT1 and connect all other communication cables in succession to the respective jacks.
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  15. Press the communication cable with cable shield into the shield clamp on the busbar below the communication assembly.