SMA Backup Select BU-SLCT-US-50

The SMA Backup Select (BU-SLCT-US-50) is an automatic backup switch with an integrated 7-circuit breaker panel for essential household loads. Designed for the Sunny Boy Smart Energy (SBSE-US-50) hybrid inverter, it delivers 120 V backup power during grid outages with adjustable switchover timing and a weatherproof NEMA 3R enclosure for indoor or outdoor installs.

Key Benefits

Automatic Partial-Home Backup: Keeps up to 7 critical circuits powered—five 15 A/120 V and two 20 A/120 V—without manual switching.

Flexible Switchover: User-configurable transfer parameters (0–60 s default 5 s) optimize comfort and code requirements.

Outdoor-Ready: NEMA 3R rating, −40 °F to +131 °F operating range, wall-mount bracket.

Quick Commissioning: Set up with the SMA 360° app; integrates cleanly with SBSE-US-50 systems.

Special Technology

Integrated Breaker Subpanel: Built-in 7-pole subpanel simplifies wiring and reduces BOS costs.

System Coordination: Works with Sunny Boy Smart Energy inverters to provide 3,840 W (SBSE 3.8–7.7) or 5,760 W (SBSE 9.6–11.5) backup output at 120 V.

Warranty

2-Year Manufacturer Warranty.

Best Uses

Essential Loads Backup: Refrigeration, lighting, networking, and small appliance circuits during outages in SBSE-US-50 systems.

Specifications Table

Specification	Data
Model	BU-SLCT-US-50
Function	Automatic backup switch with integrated breaker panel (7 circuits)
Compatible Inverters	Sunny Boy Smart Energy SBSE 3.8–7.7-US-50; SBSE 9.6–11.5-US-50
Backup Output Power	3,840 W (with SBSE 3.8–7.7) / 5,760 W (with SBSE 9.6–11.5), 120 V, 60 Hz
Max Rated Output Current	32 A (SBSE 3.8–7.7) / 48 A (SBSE 9.6–11.5)
Input / Output Voltage	240 V (input) / 120 V backup output
Switchover Settings	Start threshold: 0–600 s (default 5 s); return-to-grid interruption: 0–60 s (default 5 s)
Circuit Provisioning	(5) × 15 A / 120 V & (2) × 20 A / 120 V breakers
Enclosure Rating	NEMA 3R, indoor/outdoor; wall-mounted
Operating Temperature	−40 °F to +131 °F (−40 °C to +55 °C)
Altitude / Humidity	Up to 3000 m; 0–100% RH
Dimensions (W × H × D)	14 × 23 × 9 in
Weight	15.5 lb
Activation	Automatic
Warranty	2 Years

About SMA:

SMA Solar Technology AG is a German company renowned for its high-quality solar inverters, energy management systems, and storage solutions for residential, commercial, and utility-scale installations. Their products—such as the Sunny Boy, Sunny Tripower, and Sunny Boy Storage—offer grid integration, smart monitoring, and reliability. SMA emphasizes innovation, robust design, and compatibility with diverse solar environments, often backed by long warranties and global service infrastructure.

Why Buy From US Solar Supplier?

As an American founded company out of Kentucky, US Solar Supplier is committed to providing top-quality solar products, backed by the world’s leading manufacturers. Our promise is to get you the fairest price from the best brands that offer warranties you can count on.

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SMA Backup Select Automatic Backup Switch BU-SLCT-US-50

SMA Backup Select Automatic Backup Switch BU-SLCT-US-50

SMA Backup Select Automatic Backup Switch BU-SLCT-US-50

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