SMA Solar SMA Backup-Solution pre BU-STPH-4P63KSTHX

Grid outages can halt your solar production and leave critical loads without power. The SMA Backup Solution BU-STPH-4P63K solves this by enabling island mode operation for compatible Sunny Tripower CORE1 inverters. When the grid fails, this automatic transfer switch disconnects from the grid and allows the inverter to supply backup power to selected loads, ensuring continuous operation of essential equipment.

Who is it for

This backup solution is ideal for commercial and industrial solar installations using SMA Sunny Tripower CORE1 inverters (e.g., STP 50-40, STP 62-40). It is perfect for businesses that require reliable backup power for critical loads such as refrigeration, IT equipment, or lighting during grid outages.

Main features

• Enables island mode operation for connected SMA Sunny Tripower CORE1 inverters
• Rated current of 63 A for three-phase systems (3 x 230 V / 400 V)
• 4-pole switching (L1, L2, L3, N) for complete grid disconnection
• Integrated contactor and control unit for automatic transfer
• Wall-mounted design with IP65 protection for indoor and outdoor use
• Wide operating temperature range from -25 °C to +60 °C
• Ethernet interface for seamless communication with SMA Data Manager or inverter
• Compliant with VDE-AR-N 4105, G98/G99 safety standards

Specifications

• Product Type: Automatic Transfer Switch (ATS) / Backup Box
• Inverter Compatibility: SMA Sunny Tripower CORE1 series (STP 50-40, STP 62-40)
• Number of Phases: 3-phase
• Rated Current (AC): 63 A
• Rated Voltage (AC): 3 x 230 V / 400 V
• Nominal Frequency: 50 Hz / 60 Hz
• Switching Poles: 4-pole (L1, L2, L3, N)
• Grid Connection Type: TN-S, TN-C-S, TT
• Enclosure Protection: IP65
• Mounting Type: Wall-mounted
• Operating Temperature Range: -25 °C to +60 °C
• Relative Humidity: 0% to 100% (condensing)
• Cooling: Natural convection
• Communication Interface: Ethernet
• Functionality: Enables island mode operation during grid outages
• Safety Standards: VDE-AR-N 4105, G98/G99 compliant
• Integrated Components: Contactor for grid disconnection, control unit
• Backup Power Capability: Provides power to selected loads during grid failure

Tips

For optimal performance, ensure the backup solution is installed by a qualified electrician and configured with a compatible SMA Data Manager. Verify that the selected backup loads do not exceed the inverter's rated output during island operation. Regular testing of the transfer switch is recommended to ensure reliable operation during actual grid outages.