SMA Solar SMA Backup-Solution forBU-STPH-4P63BSTHX

When a standard solar inverter leaves your home dark during a grid outage, this SMA Backup Solution steps in with automatic switching in under 20 milliseconds. Built specifically for the Sunny Tripower Smart Energy and Sunny Tripower Hybrid series, it turns a grid-tied PV system into a resilient three-phase backup power source without external contactors or complex rewiring.

Highlights

• Automatic transfer switch (ATS) for seamless grid-to-backup transition
• Rated for 63 A continuous current at 230/400 V AC, three-phase with neutral
• Compatible with SMA Sunny Tripower Smart Energy (STP SE) and Sunny Tripower Hybrid (STP HYB) inverters
• IP65-rated enclosure for indoor or outdoor wall mounting
• Integrated contactor unit and control electronics – no additional hardware needed
• Speedwire/Ethernet communication for system monitoring and coordination
• Supports backup power up to 43 kW depending on connected inverter

In daily use

During normal operation, the Backup Solution passes grid power through to your loads while the inverter feeds solar energy. If the grid fails, the internal contactor opens and the inverter takes over as the voltage source, powering essential circuits. The switch is fast enough to keep computers, refrigerators, and lighting running without interruption. Wall mounting keeps the unit accessible for inspection, and the IP65 housing withstands dust, rain, and temperature extremes from -25°C to +60°C.

Full specifications

• Product type: Automatic Transfer Switch (ATS) / Backup Box
• Inverter compatibility: SMA Sunny Tripower Smart Energy (STP SE) and Sunny Tripower Hybrid (STP HYB)
• Number of phases: 3-phase + neutral
• Rated current: 63 A
• Nominal grid voltage: 230/400 V AC
• Switching time (grid to backup): < 20 ms
• Max AC power (backup): up to 43 kW (inverter-dependent)
• Enclosure protection class: IP65
• Mounting type: Wall mounting
• Communication interface: Speedwire / Ethernet
• Operating temperature range: -25°C to +60°C
• Relative humidity: 0% to 100% (condensing allowed)
• Certifications: CE, VDE-AR-N 4105 (Germany), other regional standards
• Housing material: Powder-coated aluminum or similar robust material

Final note

For installers and homeowners seeking a code-compliant, factory-integrated backup solution for SMA hybrid inverters, this unit eliminates guesswork and third-party contactors. Its fast switching and rugged design make it a dependable core for whole-home or critical-load backup.