Description
Key Benefits
- Automatic backup for up to 7 essential household circuits without manual switching
- User-configurable switchover timing to optimize comfort and meet code requirements
- Weatherproof NEMA 3R enclosure suitable for indoor or outdoor installation
- Integrated 7-circuit breaker panel simplifies wiring and reduces balance of system costs
- Compatible with Sunny Boy Smart Energy hybrid inverters for seamless integration
- Wide operating temperature range from −40 °F to +131 °F
- Quick commissioning via the SMA 360° app
Best Uses
Tech Specs
| Spec | Value |
|---|---|
| Model | BU-SLCT-US-50 |
| Function | Automatic backup switch with integrated 7-circuit breaker panel |
| 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 (SBSE 3.8–7.7) / 5,760 W (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 | Five 15 A/120 V and two 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% relative humidity |
| Dimensions (W × H × D) | 14 × 23 × 9 in |
| Weight | 15.5 lb |
| Activation | Automatic |
Warranty
Important: Warranty terms may vary based on installation conditions and system configuration. See manufacturer documentation for full details.
More Info
The SMA Backup Select BU-SLCT-US-50 is designed to provide automatic partial-home backup power by maintaining critical household circuits during grid outages.
It integrates a 7-circuit breaker subpanel, simplifying installation and reducing balance of system costs by eliminating the need for separate breaker panels.
Compatible exclusively with Sunny Boy Smart Energy hybrid inverters, it delivers up to 5,760 W of backup power at 120 V, depending on the inverter model.
The device features user-configurable switchover parameters, allowing customization of transfer timing to balance comfort and compliance with electrical codes.
Its rugged NEMA 3R enclosure supports both indoor and outdoor wall-mounted installations, with an operating temperature range from −40 °F to +131 °F.
Commissioning and system integration are streamlined through the SMA 360° app, enabling quick setup and monitoring within SBSE-US-50 systems.
SMA Solar Technology AG is a leading German manufacturer known for high-quality solar inverters and energy management solutions backed by robust warranties.
This product is ideal for homeowners seeking reliable backup power for essential loads such as refrigeration, lighting, and networking during outages.
The compact dimensions and integrated design make the BU-SLCT-US-50 a practical choice for residential energy resilience paired with SMA hybrid inverters.
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