AC Cabling of the Inverters

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AC cabling among the inverters (left = last inverter; right = first inverter)

Requirements:

  • All electrical installations must be carried out in accordance with all electrical standards applicable on-site and the National Electrical Code® (NE, ANSI/NFPA 70) (see National Electrical Code®, paragraph 690.8 (B)(1), paragraph 690.8(A)(3)) or the Canadian Electrical Code® CSA C22.1.
  • The maximum output current of the inverter must comply with the National Electrical Code®, paragraph 690.8 (A)(3).
  • For fusing purposes, use at maximum a two-pole, 15 A circuit breaker.
  • No loads must be connected between the individual inverters.
  • Overcurrent protection must comply with the National Electrical Code®, paragraph 690.9.
  • For the AC cable connection to the Sunny Boy, only use the AC cable recommended by SMA ( > Spare Parts and Accessories).
  • To allow for greater distances between two inverters, use an additional cable and two AC field plugs ( > Assembling the AC Field Plug).
  • Only use cables of type TC-ER observing the requirements of the National Electrical Code®, article 336.10.

Procedure:

  1. DANGER

    Danger to life due to electric shock

    Do not disconnect the AC connectors under load.

    1. Ensure that the circuit breaker is switched off and that it cannot be reconnected.
    2. Make sure that the PV modules are covered.
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  2. Plug one end of the supplied AC cable into the outer AC pin connector of the last inverter of the PV system.
  3. The plug snaps into place.
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  4. Plug the protective cap into the middle AC pin connector of the last inverter.
  5. The protective cap snaps into place.
  6. Ensure that the AC connector and the protective cap in the inverter pin connectors are securely in place.
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  7. Plug the other end of the AC cable into the middle AC pin connector of the next inverter.
  8. The plug snaps into place.
  9. Connect further inverters following the same procedure.
  10. If necessary, use AC field plugs to bridge greater distances ( > Assembling the AC Field Plug)
  11. If necessary, additionally ground the inverters ( > Connecting Additional Grounding).
  12. Connect the free end of the AC cable of the first inverter to the Sunny Multigate ( > Connecting the First Inverter to the Sunny Multigate).
    <  Sunny Multigate
    >  Assembling the AC Field Plug