SMA Solar SMA Solution de secours 3P KITBU-SBSE-3P-50

With a switching time of under 100 ms, the SMA Backup Solution 3P 50 A keeps critical loads running seamlessly during grid outages. This three-phase automatic transfer switch is engineered for residential and light commercial PV systems, delivering up to 34.5 kVA of backup power per phase at 230 V. Compatible with SMA Sunny Boy Storage 3.7, 5.0, and 6.0 inverters, it provides reliable grid disconnection and monitoring in a robust IP65 enclosure.

Overview

The SMA Backup Solution 3P 50 A is a wall-mounted automatic transfer switch designed to integrate with SMA energy storage systems. It automatically detects grid failures and switches to backup mode in less than 100 milliseconds, ensuring uninterrupted power to essential circuits. The unit supports three-phase operation at 230/400 V and 50/60 Hz, with a maximum AC current of 50 A per phase. Its Speedwire/Ethernet interface allows seamless communication with compatible SMA inverters for coordinated energy management.

What stands out

• Ultra-fast switching: <100 ms transition from grid to backup power.
• High power capacity: 34.5 kVA per phase at 230 V.
• Rugged design: IP65 protection for indoor and outdoor installation.
• Wide temperature range: operates from -25 °C to +60 °C.
• Simple integration: Speedwire/Ethernet connectivity with SMA Sunny Boy Storage inverters.

Technical details

• Product type: Automatic Transfer Switch / Backup Solution Component
• Number of phases: 3
• Max. AC current (backup operation): 50 A per phase
• Max. AC power (backup operation): 34.5 kVA at 230 V per phase
• Nominal grid voltage: 3 / N / PE, 230 V / 400 V
• Nominal grid frequency: 50 Hz / 60 Hz
• Switching time: <100 ms
• Degree of protection: IP65
• Operating temperature range: -25 °C to +60 °C
• Mounting type: Wall mounting
• Communication interface: Speedwire / Ethernet
• Compatible inverters: SMA Sunny Boy Storage 3.7 / 5.0 / 6.0
• Functionality: Automatic grid disconnection, backup power supply, grid monitoring
• Application: Residential and light commercial PV systems
• Protection class: I
• Overvoltage category: III

Our verdict

The SMA Backup Solution 3P 50 A is a dependable choice for homeowners and small businesses seeking seamless backup power. Its rapid switching, high capacity, and robust construction make it an essential component for any SMA-based solar storage system.