Backup options with Sunny Boy Storage

by Daniel Chung (guest post), , 6 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.


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.


  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.

    • 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,

  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.

    • Anke Baars
      Anke Baars says:

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


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