No product photos yet.
SMA Backup Select (BU-SLCT-US-50) automatic transfer switch
No sellers found.
Key specs
Units- SKU
- BU-SLCT-US-50Official instruction manual
Sources
SMA's code, printed on the manual's Validity page.
Official instruction manual: SMA eManual SMA Backup Select, Validity (November 3, 2026 capture) Checked · Earlier documentLocation: Validity
Documented
- Weight
- 6.09 kg13.4 lb convertedOfficial instruction manual
Sources
Printed as 6.09 kg (13.4 lb).
Official instruction manual: SMA eManual SMA Backup Select, Technical Data: General Data (November 3, 2026 capture) Checked · Earlier documentLocation: Technical Data, General Data
Documented
- Device type
- Automatic transfer switching device for single-phase battery backup with the Sunny Boy Smart Energy-USOfficial instruction manual
Sources
The function table's Grid Disconnection row.
Official instruction manual: SMA eManual SMA Backup Select, Function of the automatic transfer switching device (November 3, 2026 capture) Checked · Earlier documentLocation: Function of the automatic transfer switching device
Documented
- AC voltage
- 120 V backup output; 240 V / 208 V grid inputOfficial instruction manual
Sources
Backup nominal AC voltage; the grid side is printed on the parallel grid operation page.
Official instruction manual: SMA eManual SMA Backup Select, Technical Data: Automatic backup (November 3, 2026 capture) Checked · Earlier documentOfficial instruction manual: SMA eManual SMA Backup Select, Technical Data: Parallel grid operation (November 3, 2026 capture) Checked · Earlier documentLocation: Technical Data, Automatic backup and Parallel grid operation
Documented
- Dimensions
- 31.05 LW: 506 × H: 260 × D: 236 mmW: 19.9 × H: 10.2 × D: 9.29 in convertedOfficial instruction manual
Calculated: Enclosure volume: W × H × D ÷ 1,000,000
Sources
With the wall mounting bracket; 226 mm deep without it.
Official instruction manual: SMA eManual SMA Backup Select, Technical Data: General Data (November 3, 2026 capture) Checked · Earlier documentLocation: Technical Data, General Data
Calculated
- AC frequency
- 60 HzOfficial instruction manual
Sources
The AC grid frequency row.
Official instruction manual: SMA eManual SMA Backup Select, Technical Data: Parallel grid operation (November 3, 2026 capture) Checked · Earlier documentLocation: Technical Data, Parallel grid operation
Documented
- Enclosure
- NEMA Type 3ROfficial instruction manual
Sources
The degree of protection row.
Official instruction manual: SMA eManual SMA Backup Select, Technical Data: General Data (November 3, 2026 capture) Checked · Earlier documentLocation: Technical Data, General Data
Documented
- Operation
- AutomaticOfficial instruction manual
Sources
The switching mode row.
Official instruction manual: SMA eManual SMA Backup Select, Technical Data: Automatic backup (November 3, 2026 capture) Checked · Earlier documentLocation: Technical Data, Automatic backup
Documented
- Compatible series
- SBSE3.8-US-50 to SBSE11.5-US-50Official instruction manual
Sources
The compatible inverters row.
Official instruction manual: SMA eManual SMA Backup Select, Technical Data: Automatic backup (November 3, 2026 capture) Checked · Earlier documentLocation: Technical Data, Automatic backup
Documented
All specs9
- Weight
- 6.09 kg13.4 lb convertedOfficial instruction manual
Sources
Printed as 6.09 kg (13.4 lb).
Official instruction manual: SMA eManual SMA Backup Select, Technical Data: General Data (November 3, 2026 capture) Checked · Earlier documentLocation: Technical Data, General Data
Documented
- Device type
- Automatic transfer switching device for single-phase battery backup with the Sunny Boy Smart Energy-USOfficial instruction manual
Sources
The function table's Grid Disconnection row.
Official instruction manual: SMA eManual SMA Backup Select, Function of the automatic transfer switching device (November 3, 2026 capture) Checked · Earlier documentLocation: Function of the automatic transfer switching device
Documented
- AC voltage
- 120 V backup output; 240 V / 208 V grid inputOfficial instruction manual
Sources
Backup nominal AC voltage; the grid side is printed on the parallel grid operation page.
Official instruction manual: SMA eManual SMA Backup Select, Technical Data: Automatic backup (November 3, 2026 capture) Checked · Earlier documentOfficial instruction manual: SMA eManual SMA Backup Select, Technical Data: Parallel grid operation (November 3, 2026 capture) Checked · Earlier documentLocation: Technical Data, Automatic backup and Parallel grid operation
Documented
- Dimensions
- 236 D × 506 W × 260 H mm9.29 D × 19.9 W × 10.2 H in convertedOfficial instruction manual
Sources
With the wall mounting bracket; 226 mm deep without it.
Official instruction manual: SMA eManual SMA Backup Select, Technical Data: General Data (November 3, 2026 capture) Checked · Earlier documentLocation: Technical Data, General Data
Documented
- AC frequency
- 60 HzOfficial instruction manual
Sources
The AC grid frequency row.
Official instruction manual: SMA eManual SMA Backup Select, Technical Data: Parallel grid operation (November 3, 2026 capture) Checked · Earlier documentLocation: Technical Data, Parallel grid operation
Documented
- Enclosure
- NEMA Type 3ROfficial instruction manual
Sources
The degree of protection row.
Official instruction manual: SMA eManual SMA Backup Select, Technical Data: General Data (November 3, 2026 capture) Checked · Earlier documentLocation: Technical Data, General Data
Documented
- Operation
- AutomaticOfficial instruction manual
Sources
The switching mode row.
Official instruction manual: SMA eManual SMA Backup Select, Technical Data: Automatic backup (November 3, 2026 capture) Checked · Earlier documentLocation: Technical Data, Automatic backup
Documented
- Compatible series
- SBSE3.8-US-50 to SBSE11.5-US-50Official instruction manual
Sources
The compatible inverters row.
Official instruction manual: SMA eManual SMA Backup Select, Technical Data: Automatic backup (November 3, 2026 capture) Checked · Earlier documentLocation: Technical Data, Automatic backup
Documented
- Operating temperature
- -40 to 55 °C-40 to 131 °F convertedOfficial instruction manual
Sources
Printed as -40 to +55 °C.
Official instruction manual: SMA eManual SMA Backup Select, Technical Data: General Data (November 3, 2026 capture) Checked · Earlier documentLocation: Technical Data, General Data
Documented
Published claims and calculations, not independent test results.
Documents
- WEBOpenSMA eManual SMA Backup Select, Function of the automatic transfer switching device (November 3, 2026 capture)Official
Source details
Captured 2026-11-03T06:30:40.264Z (archived copy).
Location: Function of the automatic transfer switching device
Retrieved
The page of SMA's online manual for SMA Backup Select describing the function of the automatic transfer switching device (manuals.sma.de, BU-SLCT-US-50), fetched directly from SMA's own host with the paced research fetcher on November 3, 2026 (robots.txt checked first; request ended 06:30:40.264 UTC). Manufacturer claims, not independent tests.
Archive and older revisions
Archive and older revisions4
Earlier revisions, archived captures and copies published by someone other than the manufacturer. Every one stays reachable.
- WEBOpenSMA eManual SMA Backup Select, Technical Data: Automatic backup (November 3, 2026 capture)Official
Source details
Captured 2026-11-03T06:30:26.402Z (archived copy).
Location: Technical Data, Automatic backup
Retrieved
The Automatic backup page of SMA's online manual for SMA Backup Select (manuals.sma.de, BU-SLCT-US-50), fetched directly from SMA's own host with the paced research fetcher on November 3, 2026 (robots.txt checked first; request ended 06:30:26.402 UTC). Manufacturer claims, not independent tests.
- WEBOpenSMA eManual SMA Backup Select, Technical Data: Parallel grid operation (November 3, 2026 capture)Official
Source details
Captured 2026-11-03T06:30:13.043Z (archived copy).
Location: Technical Data, Parallel grid operation
Retrieved
The Parallel grid operation page of SMA's online manual for SMA Backup Select (manuals.sma.de, BU-SLCT-US-50), fetched directly from SMA's own host with the paced research fetcher on November 3, 2026 (robots.txt checked first; request ended 06:30:13.043 UTC). Manufacturer claims, not independent tests.
- WEBOpenSMA eManual SMA Backup Select, Technical Data: General Data (November 3, 2026 capture)Official
Source details
Captured 2026-11-03T06:29:59.234Z (archived copy).
Location: Technical Data, General Data
Retrieved
The General Data page of SMA's online manual for SMA Backup Select (manuals.sma.de, BU-SLCT-US-50), fetched directly from SMA's own host with the paced research fetcher on November 3, 2026 (robots.txt checked first; request ended 06:29:59.234 UTC). Manufacturer claims, not independent tests.
- WEBOpenSMA eManual SMA Backup Select, Validity (November 3, 2026 capture)Official
Source details
Captured 2026-11-03T06:15:08.896Z (archived copy).
Location: Validity
Retrieved
The Validity page of SMA's online manual for SMA Backup Select (manuals.sma.de, BU-SLCT-US-50), fetched directly from SMA's own host with the paced research fetcher on November 3, 2026 (robots.txt checked first; request ended 06:15:08.896 UTC). Manufacturer claims, not independent tests.
Warranty
No warranty terms on file.
Sellers
No sellers found.
Price history
No seller price history.
Owner reviews
No reviews yet
Own one? A verified review needs a receipt and a serial number photo, and counts 19× in the owner rating.
Evidence score
This category has no Evidence score.
Certificates
No certificates on file. Certificate guide
Parts and accessories
No sourced accessories or replacement parts listed yet.
Model history
Model identity
- Model
- BU-SLCT-US-50
Manufacturer SKU BU-SLCT-US-50
No historical observations recorded yet.
Community discussions
No discussions linked yet. Search DIY Solar Forum
Recalls / legal notices
No recalls or legal notices on file; this is not a complete recall or court search. All notices · Report a notice
No reviewsSomething wrong that is not one of the values above?
Prices · price basis. * Calculated; estimates labeled. Value needs confirmation; select it for the reason.