Tech Tip: Proper Communication for Sunny Island and Sunny Boy Systems

This post was originally published in 2014. The tips and techniques explained may be outdated.

Tech Tip: Proper Communication for Sunny Island and Sunny Boy Systems

Sunny Island systems, especially in grid-tied battery-backup configurations, can do amazing things as standalone micro-grids. But they all depend on communication. Today, we’re discussing the proper communication configuration between the Sunny Island and Sunny Boy for optimal use.

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  1. Avatar
    Bj says:

    I currently have a grid-tied SunnyBoy 3000TL-US-22. I am adding a Summy Island 6048 -US. In my SB I have a web connect module. What additionally will I need for the SB an SI to communicate with each other and for me to monitor each through sunny portal and sunny Explorer? Please advise. Thanks!

  2. Avatar
    Joshua Brumsted says:

    I am installing the sunny boy 6.0 pv inverters along with 4 Sunny Island 6048. How do I go about getting all of the inverters to communicate? The 6.0 inverters do not use the rs-485 and as far as I know the only protocol for the islands is rs-485.

  3. Avatar
    jesus gallardo says:

    Hey I got two sunny boy inverters(7700helpl-us)and two sunny island 6048-48, trying to interface for emergency backup off grid situation. Understand and have data modules for both 7700 and piggy back cards installed but don’t know where to land second 7700 cat5 cable

  4. Avatar
    Ken says:

    Hi SMA Tech,

    We’re designing some systems for installation in 50 Hz, 230V, single phase locations. Two S.I. 8.0H and two SB3.6-1AV-40 will be used and obviously they need to communicate with each other. We also want to be able to look at the system remotely via the web. From what I can see the SI have 3 different communications cards available and then externally there is Home Manager, Webbox?, maybe others. I would love to see a chart describing these options. We have purchased a Speedwire card for our Master S.I. but now I think that won’t help us get on the web. Can you help?

  5. Avatar
    Wayne says:

    I have a sunny island 6048 us and one sunny boy 5000us. I havnt installed my system yet. Will these units work with just basic wiring for standard use or is a piggyback card install a requirement for a standard install?

  6. Avatar
    John Kago says:

    Hi, I decommissioned a cluster of sunny islands back in 2016,and I would like to use them as single systems. However, I keep getting the F743 Cancom error from all three inverters on starting the system. I have updated the inverters. I am not using the syscan module since it’s not a multicluster system. How do I clear the error?

  7. Avatar
    Afolabi Ajiboro says:

    Hi, myself and team leader are installing three Sunny Islands and one Sunny boy for an off-grid system. so far we have installed and configured the three S.I inverters. I was asked to figure out how to connect the Sunny Boy to the Sunny Island inverters. while I understand the electrical conections, I’m confused about the communication link. is there anything I’ll need that is not in the scope of delivery? Thank you

  8. Avatar
    Rohan says:

    I am planning an installation with 24xSB-240-US-10 micro inverters, 2xMULTIGATE-US-10 multigates, 8x200AH 12V batteries (2P4S) and A Sunny Island 4548-US-10 Inverter.

    Will I be able to set up an AC-Coupled Micro-Grid System with these components?

    I see a lot of information about using other SMA inverters in AC-Coupled, micro-grid configurations, but I’d like to confirm that using micro-inverters with the Sunny Island is a viable option.

    Thank you

  9. Avatar
    Daren Brown says:

    I have a cluster of 4 sunnyboy 6000US-10 a WebBox-BT.20.GR1,a Bluetooth module and couple RS485 piggy back card. How can I connect all four sunnyboys in the cluster and have it connect to the WebBox with a single Bluetooth module. Any suggestions please?

  10. Avatar
    Roland says:

    Hi, currently I’ve got a Sunny Boy 5000 with 12 panels.
    I want to have power during an outage, and keep using my current panels. I’m very confused whether I can just add a Sunny Island + Batteries to achieve this? Or do I need to connect more solar panels directly to the Sunny Island?
    I’ve spoken to an installer here in NZ and he says I need to buy a new inverter to be able to use my solar panels during an outage.

  11. Avatar
    Jakob says:


    Is it possible to use SB-240-US-10 micro inverters in combination with a Sunny Island SI6048-US-10 inverter in an off-grid scenario to provide extra power and reverse battery charging through the Sunny Island?


  12. Avatar
    Asim Aslam says:

    I have installed sunny island three phase single cluster consisting of 3 sunny island and 4 sunny boy inverters. I want to upload data to sunny portal. how many SIcomsma card will be required?

  13. Avatar
    Go Solar says:

    I am getting conflicting information from SMA on the new Sunnyboy storage Inverter (SBS6.0-US-10 ) and the Automatic Backup Unit SBS-ABU-200-US-10. Originally I was told these will not operate with the SB-TL-US-22 inverters. But then was told they would. However I still have not gotten confirmation on how they would operate together. The two SB-4000TL-US-22 inverters have RS-485 communications boards that connect to a Webbox. Does the ABU or SBS inverter have an RS-485 interface that can be connected to the two SB-4000TL-US-22 inverters and Webbox to switch them to off-grid mode so they can be controlled with Frequency Shift Power Control (FSPC) of the Sunnyboy storage Inverter (SBS6.0-US-10 )? If not how can this be achieved? It appears the SWDM-US-10 Webconnect modules for the SB-4000TL-US-22 inverters may be needed. Can you confirm what the options are and how this integration is designed to be implemented?

  14. Avatar
    NT says:

    I have a Sunny Boy 5.0-US and I just purchased the revenue grade energy meter for use with rs485.
    After looking everywhere for the proper rs485 card it simply is not available.
    In the manual for the revenue grade meter it states specifically to use the SMA RS485 40.
    Every module I see any place I look is for the TL 22 series. Can you please point me to the link for the correct part ?.

  15. Avatar
    Johnny Valentine says:

    I’ll be installing 2 SI6048’s to give backup power to and existing customer in the US. He has two SB 6.0 inverters. I understand that I must put the SB’s in backup mode so that they will respond to FSPC. How can I affordably give monitoring to the SI6048’s. Last time I did it web boxes were plentiful.

    Thank you

  16. Avatar
    Dan says:

    I have a site that I am looking to expand by adding two 7700TL-US-22 units in the three phase mode. I currently have three SB 7000-US and three SB 5000-US units connected to twelve SI-6048-US units in an off grid-capacity.

    Will these TL-22s be able to communicate with the Sunny Islands? My installer seems to think they should work. I noticed that as of February 2016, your documentation shows that the 7700TL-US-22 is no longer supported in an off-grid mode. I am a little confused as to whether or not these are compatible or if there are any limitations on it.

  17. Avatar
    Peter says:

    I have two new model SB7.0’s only on gridtie and I have two new model SB6.0-1SP-US-41 inverters ac-coupled interfacing to two SI6048-US-10 Sunny Islands. Sunny Island is RS485 (with piggyback card) and the SB6.0 is speedwire/wifi. Sunny Island also has a sorta CANbus (com sync). Communication between the slightly older SI and brand new SB is unclear. I’m sure there are other people out there who have say older SI’s and installed newer inverters. This is for grid backup. Setting the SB’s to off grid while the grid is down doesn’t make sense. Or lets say you have a purely grid tie with older SB’s and you bought new SI6.0 inverters. How do they communicate? I know SMA doesn’t like dealing with end users…. but there are plenty of “installers” who have electronics/engineering background looking for answers. Guys have told me the 6048 series needs firmware updates to make it possible. Hopefully you don’t leave us hanging.

    • Mike
      Mike says:

      Peter – If the only communication you are looking for is for the inverters behind the SIs to be set to “off grid” mode when the grid fails, the recommendation is to set them to off-grid mode permanently. The SIs are the UL 1741 listed “gatekeepers” upstream of the Sunny Boys, and can disconnect them from the grid according to UL 1741 limits. Then they are ready for Frequency Shift Power Control in backup mode.


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