Tech Tip: SMA Sunny Island Smartformer

From on 02/07/2014 in Category Technology with 6 Comments

The Smartformer for Sunny Island is a 120 V/240 V autoformer that’s ideally configured for AC-coupled systems using a Sunny Island and a Sunny Boy. Getting it ready for commissioning is a simple, straight-forward process.

In this Tech Tip, Solar Academy trainer Greg Smith demonstrates how to connect each of the components in a typical grid-tied or off-grid AC-coupled system using an SMA Smartformer.

Have a question for the Solar Academy trainers? Send it to and we might just answer your question in our next Tech Tip! 

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  • avatar


    12/16/2018 at 6:30 am

    I’ve got a project in which I have an SMA 25000TL-30 Inverter (3-Phase, 400 V). Could you please help and guide me regarding how to connect a battery bank for when the grid goes down.

    Reply »
  • avatar

    Uttam Chauhan

    08/02/2019 at 10:49 pm

    I am in a process of setting up SMA Island two units with Island Smartformer. I have few question.

    1. Does Smartformer comes with miniature breakers needed to connect to PV, Island, and Grid side?
    2. Does Smartformer automatically disconnect grid until grid comes back (Utility requirement of not feeding back the power to the grid when Gird is cut off? Or anything other switch is required to complete connection to the grid? Any support document for the Utility to show that that requirement is fulfilled?
    3. What else I will need to connect SMA Inverter, SMA Island, Smartformer in terms of data communication or setting up / commissioning? Will ony Web box work to connect all these three or need other cards?


    Reply »
    • avatar


      08/05/2019 at 10:49 am

      Uttam, good day! SMA has discontinued the Smartformer. I would suggest investigating the MidNite Solar device here () as it is the SMA autoformer from the Smartformer device. The Sunny Island is responsible for disconnecting all devices connected to its AC1 terminals according to its UL1741 listing. For communications, the Sunny Island only talks RS485. For local monitoring, an SMA Com Gateway and Sunny Explorer software can be used to see the RS485 data from the SI and the Speedwire data from the current Sunny Boys. All of the above information is valid only for the Sunny Island 4548-Us and 6048-US.

      Reply »
      • avatar


        08/11/2019 at 12:52 pm

        Hi Mike,

        Thanks for response. Are RS485 cards same for SI 4548-US/6048US and SB5000/6000 or RS485 cards are different for SI?

        I have SMA SB RS 485-N Communication Card (485USPB-NR) – will this work with SI.



      • avatar


        08/12/2019 at 11:34 am

        Uttam – yes, that card works both in the older SBs and the SI xx48-US.

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