Ensure reliable power continuity and advanced energy monitoring with the SMA 200 A Automatic Backup Unit. Designed for residential and light commercial PV-battery systems, this unit seamlessly manages grid outages, system transitions, and energy metering—all in one pre-wired cabinet.

Key Features & Benefits

• High-capacity 200 A rated bus for direct connection with a main electrical panel or large service entrance. 

• Built-in energy meter and current transformers (CTs) for accurate monitoring of system consumption and power flows, eliminating need for separate metering hardware.

• Automatic transfer switch architecture: upon grid failure the unit disconnects from utility, activates backup mode and supports secure-power transitions. 

• AC-coupled compatibility — supports integration of your existing PV system and/or battery inverter (particularly with SMA’s “Sunny Boy Storage” line) via 240 V / 120 V split-phase architecture. 

• Outdoor-rated enclosure (NEMA 3R / UL50) and pre-wired design for simplified installation and commissioning. 

• Supports unbalanced loads (e.g., up to ~5 kVA imbalance) when operating in backup mode, enhancing flexibility for whole-house backup scenarios. 

Technical Snapshot

• Model: SBS-ABU-200-US-10

• Rated Grid Voltage: 240 V (split-phase 240/120 V) 

• Rated Current (Bus): 200 A 

• Max Unbalanced Load in Backup: ~41.6 A at 120 V (~5 kVA) 

• Enclosure Type: Outdoor rated (NEMA 3R / UL50) 

• Dimensions: Approx 500 × 700 × 250 mm (19.69″ × 27.56″ × 9.84″) 

• Operating Temp Range: −25 °C to +55 °C (−13 °F to 131 °F) 

Why Choose This Unit?

For systems where backup power matters — residential homes, small commercial sites, or retrofit battery installations — the SMA 200 A Automatic Backup Unit delivers an integrated solution: metering, transfer switching, AC-coupling compatibility and a large bus capacity all in one. Its pre-wired, tested design reduces installation complexity and a reliable brand backing provides long-term confidence.

Installation & Compatibility Notes

• Best paired with SMA’s Sunny Boy Storage inverters or compatible AC-coupled storage systems.

• Ensure your main service panel, load panel or backup panel is compatible with 200 A bus rating and the split-phase 240/120 V architecture.

• While pre-wired, still ensure professional commissioning: verify CT placement, metering integration, and backup-mode transitions.

• Consider the layout of backup loads and whether the “protected loads” side or whole-home side is being supported.

• Ensure local code compliance (breaker sizing, transfer switch wiring, utility interconnection) and maintain proper clearances & ventilation.

Document: Specification Sheet