Backup options with Sunny Boy Storage

by Daniel Chung (guest post), , 22 Comments

With the Sunny Boy Storage 3.6/5.0/6.0 range, you can have backup power for your home when there is a blackout. In this blog, we will discuss how to use the Secure Power Supply function included in your Sunny Boy Storage and alternatively how you can have automated backup of your household with the optional Automatic Backup Unit.

Comparing your backup options

Secure Power Supply Full Backup
Requirements · Sunny Boy Storage 3.6/5.0/6.0 · Sunny Boy Storage 3.6/5.0/6.0

· Automatic Backup Unit (optional add-on)

Max Load (230Vac) 3.7 kW Sunny Boy Storage Rating + up to 7.7kW from PV
Power Source Batteries Batteries + PV
Operation Activated by manual switch Automatically switched on after blackout

Simplest option: Secure Power Supply (included)

The Secure Power Supply function, which comes standard with the Sunny Boy Storage 3.7/5.0/6.0, can be used to power dedicated circuits in your home. Using a 3-way switch, the homeowner can manually changeover from grid power to battery power after a blackout. Even though the Secure Power Supply is limited to 3700 W, the 3-way switch can be wired to specific circuits in the home that can be powered within this limit. For e.g. in a typical home, you could expect to power your LED/CFL lights, TV and several small electrical devices like computers, modems and possibly refrigerators depending on their startup demand. Check your home appliances to see their power usage value in Watts (W).

The figure below shows how you can use the 3-way switch in a typical house. In this example, we power one of the circuits and the lighting circuit. The homeowner only needs to move the switch over when they notice a blackout. When grid power is restored, the homeowner needs to switch back the 3-way switch to the original position.

Automatic Backup Power

The homeowner may want the Sunny Boy Storage to automatically power their household circuits when there is a blackout. By installing the optional Automatic Backup Unit, the household loads are automatically disconnected from the grid and the loads may continue to be supplied from the battery storage system and the PV system. In this setup, additional power is available from the PV inverter, which allows a greater number of appliances to be powered simultaneously, and a longer period of autonomy from the grid.

Conclusion

Backup power from your battery system is possible when using the Sunny Boy Storage battery inverter. The already included Secure Power Supply feature provides an economical way to achieve manual backup during a blackout. Alternatively, automatic backup to your full home during a blackout is possible with the optional Automatic Backup Unit.

 

22 Comments
  1. Avatar
    Jonathan Holmes says:

    Could you please provide more details about the automated backup switch and where it can be purchased from (in NZ). Many thanks.

    Reply
    • Anke Baars
      Anke Baars says:

      Hi Jonathan,
      Sorry for the delay. Thank you for your interest on the automatic backup switch. I referred you to my colleague who will contact you directly.
      Kind regards,
      Anke

      Reply
  2. Avatar
    Roberto Santucci says:

    Hi Anne

    Can you provide the name and contact details to a Certified SMA Installer in Adelaide SA. I have 2 x SMA SBS 2.5 and 2 Tesla PW 1s that have no back up or grey out fail.over. I would consider the new SMA SBS 6KW or 8KW with auto back up and connect both Tesla 1 battery packs and posit acquire 1 addition for a total of 21kw in battery back up. Please pass this on to a Certified top SMA Installer please.

    Reply
    • Anke Baars
      Anke Baars says:

      Hi Roberto,
      Thank you for your request. My colleague on site will contact you directly.
      Kind regards,
      Anke

      Reply
  3. Avatar
    MICHAEL FERRAZ says:

    we currently have a 15 KW PV system using two sunny boy 7.7 inverters tied directly to the utility. We ran 6-30 Amp 220V circuits to our main house panels, expecting to install multiple sunny islands to provide battery backup for the entire house, we also have an automatic transfer switch and a 20 KW standby generator. I am now very interested in the new sunny boy storage as a possible option for providing our backup power. Can you have someone contact me to discuss the parts we would need and whether we could use the transfer switch we already have as the ABU switch? Thank you.

    Reply
    • Anke Baars
      Anke Baars says:

      Hi Michael,
      Thanks for your request. Please check your email, my colleague contacted you directly via your email.
      Kind regards,
      Anke

      Reply
  4. Avatar
    Nathan Clasohm says:

    Hi Anke
    Im interested in installing a SBS 5kw with the LG them HV battery for a customer
    Iv installed a few sunny islands but not your SBS yet
    Im interested in where I can get a change over switch or ABU switch in Adelaide South Australia
    which wholesaler etc

    Also do I need an SMA smart to run the SBS

    Reply
  5. Avatar
    David Mills says:

    Hi Anke,
    I have 2 x SMA SBS 2.5 and 2 Tesla PW 1s in Sydney that have no back up. This is a 3 phase system with a PW and an SBS 2.5 on two of the phases. IThe PW1s are totally reliable so I would be looking for the automatic backup at a price significantly below buying a new PW2. Would love to talk to your colleagues in Sydney. Many thanks.

    Reply
      • Avatar
        Roberto Santucci says:

        Can you also Contact me I have the same issue as David.

        I have 2 x SMA SBS 2.5 and 2 Tesla PW 1s in Adelaide that have no back up. This is a 3 phase system with a PW and an SBS 2.5 on phase A and second one phase C. The PW1s are totally reliable so I would be looking for the automatic backup at a price significantly below buying a new PW2. Would love to talk to your colleagues in Adelaide Many thanks.

  6. Avatar
    Roberto Santucci says:

    I have 2 x SMA SBS 2.5 and 2 Tesla PW 1s in Adelaide that have no back up. This is a 3 phase system with a PW and an SBS 2.5 on phase A and second one phase C. The PW1s are totally reliable so I would be looking for the automatic backup at a price significantly below buying a new PW2. Would love to talk to your colleagues in Adelaide Many thanks.

    Reply
  7. Avatar
    gmotyka says:

    Could you please provide more details about the automated backup switch and where it can be purchased from. ( Slovak or Czech Republic ). It is possible buy only backup unit controller ?

    thx

    Reply
  8. Avatar
    Solar One says:

    I have been looking into the Sunny Boy Storage SBS6.0-US-10 and after reading all the installation manuals and data sheets watching all available SMA install videos I still have some unanswered questions about the system.

    1) Will the SBS6.0-US-10 work with older Sunny Boy Solar Inverters (SMA 4000TL-US) in an AC coupled Autobackup configuration? I.E. Switch them to Off-Grid operation via the RS-485 Bus and then control their production output via Frequency shift?

    2) There is reference to 3rd Party Backup in some of the Sunny Boy Storage literature or Press releases. What are the 3rd Party Backup solutions that the Sunny Boy Storage supports? Will it support a generic Generator Transfer switch (with modifications) as a service disconnect?

    3) SBS6.0-US-10 Literature indicates the SBS has three (3) battery inputs and can support three (3) different types of batteries yet as delivered it can only support two (2) different types of batteries as inputs A/B are wired in parallel. The manual does not address the connection of Two (2) 20A batteries such as the RESU10H (Type-C). Or how three (3) batteries of different types can be connected. It appears that a different configuration of the RESU10H (Type-C) is required to parallel the outputs if the SBS can’t support three (3) isolated units.

    4)What is the actual backup procedure? On loss of AC Grid power does the SBS Autobackup house power go down, then disconnect the AC Grid, then re-start the house grid? Is there a delay in the Sunny Boy Inverters coming back on-line? On restore does the house power go back down and then the AC Grid power is reconnected? Or are any of the transfers seamless?

    SMA AutoBackup Unit
    1) Is the Automatic Backup Unit Service Rated? I.E. Does it have a 200A OCP device? It appear not to be service rated and thus requires an additional Service Disconnect between it and the service meter.

    2) This is a very Large device can the individual units inside the AutoBackup Unit be purchased separately? Specifically the Backup Controller , Energy Monitor, and the grid disconnect switch?

    Thanks.

    Reply
    • Anke Baars
      Anke Baars says:

      Hi,
      Thanks for your interest in our battery inverter Sunny Boy Storage.
      I forwarded your technical questions to my colleague, who will contact you directly.
      Kind regards,
      Anke

      Reply
  9. Avatar
    Donald says:

    Does this backup system interact with Sunny Boy inverters to regulate the PV production during backup operation? If so, what models, what accessories and configuration, how does it work?

    Last I read, the latest crop of SMA Sunny Boy inverters can be used for grid-tie, or can be used for off-grid. But, they can NOT be used for grid backup. I think this is because they are commissioned either with grid-interactive parameters, or to respond to frequency shift as a way to control power production. But, they have no communication mechanism to be told when the backup system has disconnected from the grid and operating mode should change. Unlike earlier Sunny Boy models. (Asking primarily regarding California installations.)

    Thanks.

    Reply
    • Anke Baars
      Anke Baars says:

      Hi Ray,
      Best way would be to talk to an installer close to you. He can advise and plan a storage installation. In the meantime you might find some useful information about storage systems in this post.
      Kind regards,
      Anke

      Reply
  10. Avatar
    Susan Phillips says:

    Hi- I have a 7year old SMA system with SB4000 and 2 Sunny Island 5048U.
    The Sunny Island slave has failed and now I am looking into possibly a different combo set-up including a generator that will be on demand for 240 use so that I don’t overload the Sunny Islands. I would appreciate a dialogue about the options

    Reply
    • Annika Linke
      Annika Linke says:

      Hi, Susan,
      it would be great if you first asked this technical question to your installer. He knows your system best. If he can’t help, please contact my colleagues at the Service Line for this specific case. Thank you very much. Kind regards, Annika

      Reply

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