SMA Sunny Boy Backup Start Module

SMA Sunny Boy Backup Start Module

Model Number: BU-STRT-US-50

Why Choose the SMA Backup Start Module?

Are you installing a hybrid solar + storage system and want a way to provide backup power even when the inverter is de‑energized? The SMA Sunny Boy Backup Start Module is designed to help you achieve seamless emergency startup functionality. Whether you’re a homeowner wanting power during outages or a solar installer building reliable systems, this module enables your SMA Sunny Boy Smart Energy inverter to initiate backup or “secure power supply” modes even after a full shutdown.

Key Features

• Emergency Startup Capability: Contains a small internal battery that allows the system to start operations even when no external power is available.

• Enables Backup & Secure Power Supply Functions: Required to activate SMA’s Backup Secure or battery‑backup modes in compatible inverters.

• Compact and Integrated Design: Fits directly into certain SMA hybrid inverters without needing a separate external box.

• Broad Compatibility with SMA Inverters: Works with specified Sunny Boy Smart Energy series models for safe and reliable operation.

• Protection & Compliance: Includes safety features and only operates within permitted ranges to help protect the inverter and system.

Versatile Applications – SMA Sunny Boy Backup Start Module

Ideal for:

• Homes wishing to maintain power during grid outages, especially for essential circuits

• Solar + storage systems where automatic or manual backup switching is required

• Installations using SMA Sunny Boy Smart Energy inverters that support backup or secure power modes

• Systems that may have rapid shutdown or disconnects that would otherwise prevent inverter re-initialization

Why SMA Solar Technology?

SMA is a globally respected leader in solar inverter and hybrid energy solutions, known for performance, reliability, and innovation. Their ecosystem—ranging from inverters to backup modules to system controllers—is designed for integration, flexibility, and long-term support. The Backup Start Module exemplifies their approach: ensuring your system remains robust even when the grid fails. With strong warranties, technical support, and decades of industry experience, SMA stands behind every component they deliver.

Additional Information

Delivery Information:
All accessoires are carefully packed and shipped directly from our trusted suppliers. Delivery times may vary based on location and availability. Please allow up to 5 business days for processing and shipment. Shipping costs are calculated at checkout.

Data Sheet:
For detailed technical specifications, installation guidelines, and more, please refer to the Data Sheet under the corresponding tab on the product page. It contains comprehensive information to help you understand the performance and features of the module.

Customer Support:
If you have any questions or need further assistance, feel free to reach out to us. Our dedicated team is available to support you with product inquiries, installation guidance, and more.