Intended Use


SMA Backup Select is an automatic transfer switching device that enables single-phase automatic backup operation in the SMA Home Energy Solution with the SMA inverters listed below. In the event of a power failure, the hybrid inverter ensures that SMA Backup Select automatically switches to automatic backup operation and the hybrid inverter can supply the loads connected to the automatic backup system with power from the battery and the PV system.

The neutral conductor of SMA Backup Select is not switched.

SMA Backup Select must only be used with the following SMA inverters:

  • SBSE3.8-US-50 (Sunny Boy Smart Energy 3.8-US)

  • SBSE4.8-US-50 (Sunny Boy Smart Energy 4.8-US)

  • SBSE5.8-US-50 (Sunny Boy Smart Energy 5.8-US)

  • SBSE7.7-US-50 (Sunny Boy Smart Energy 7.7-US)

  • SBSE9.6-US-50 (Sunny Boy Smart Energy 9.6-US)

  • SBSE11.5-US-50 (Sunny Boy Smart Energy 11.5-US)

The product is intended for installation as a separate accessory.

The product must be mounted on a sufficiently load-bearing and closed wall.

The product is intended for use in residential and industrial environments.

The product is suitable for indoor and outdoor use.

The product must not be installed in areas exposed to direct solar irradiation or must be protected from direct solar irradiation by appropriate measures.

All components must remain within their permitted operating ranges and their installation requirements at all times.

Use SMA products only in accordance with the information provided in the enclosed documentation and with the locally applicable laws, regulations, standards and directives. Any other application may cause personal injury or property damage.

The documentation must be strictly followed. Deviations from the described actions and the use of materials, tools, and aids other than those specified by SMA Solar Technology AG are expressly forbidden.

Alterations to the SMA products (except those described here), e.g., changes or modifications, are only permitted with the express written permission of SMA Solar Technology AG. Unauthorized alterations as well as failure to observe the documentation will void guarantee and warranty claims and in most cases terminate the operating license. SMA Solar Technology AG shall not be held liable for any damage caused by such changes.

Any use of the product other than that described in the Intended Use section does not qualify as appropriate.

The documentation supplied is an integral part of SMA products. Keep the documentation in a convenient, dry place for future reference and observe all instructions contained therein.

This document does not replace any regional, state, provincial, federal or national laws, regulations or standards that apply to the installation, electrical safety and use of the product. SMA Solar Technology AG assumes no responsibility for the compliance or non-compliance with such laws or codes in connection with the installation of the product.