SMA Multicluster Box – High-Capacity AC Distribution & System Integration Cabinet

Build scalable, high-power battery and off-grid systems with confidence. The SMA Multicluster Box is engineered to function as the central AC distribution hub for multi-cluster inverter setups (such as systems built around the SMA Sunny Island series), simplifying wiring, load distribution, generator integration and system expansion. 

Key Features & Benefits

• Scalable capacity – Designed to support capacities from roughly 20 kW up to 300 kW or more, depending on model. 

• Pre-wired & factory configured – Reduces installation time and complexity: includes internal wiring for clusters, PV/renewables & generator integration. 

• Flexibility for off-grid and battery backup systems – Ideal for stand-alone grids, rural electrification, micro-grids, hybrid applications. 

• Robust safety & distribution features – Includes generator bypass, reverse current monitoring, active anti-islanding, integrated load-shedding and fuse/circuit breaker protection. 

• Robust construction – Suitable for demanding environments, factory-rated enclosures, wide ambient temperature ranges. 

Applications

• Off-grid solar or hybrid systems where multiple 3-phase inverter “clusters” (e.g., 3 × Sunny Island) are connected.

• Commercial battery-backup installations, remote sites or micro-grid setups where modular expansion is required.

• Systems needing central AC-distribution board combining PV, battery inverter clusters, generator connection and load side.

Technical Snapshot (Example Model)

• Model examples: MC-BOX-6.3-11, MC-BOX-12.3-20, MC-BOX-36.3-11 (depending on capacity). 

• Rated power (AC): e.g., 55 kW for MC-Box-6.3-11, up to 300 kW for MC-Box-36.3-11. 

• Number of Sunny Island devices/clusters: e.g., 2-12 three-phase clusters. 

• Ambient temperature range (example): −25 °C to +60 °C. 

• Protection class: e.g., IP55 in some versions. 

Why Choose the SMA Multicluster Box?

When you’re designing a large-scale battery-based or off-grid system, the Multicluster Box offers a streamlined way to manage AC distribution, integrate multiple clusters, handle generator/PV inputs and simplify system expansion. It reduces the need for custom wiring, separate distribution boards and complex layout – saving installation time and cost while delivering reliable performance.

Installation & Considerations

• Ensure compatible clusters: The Multicluster Box is typically paired with SMA Sunny Island inverters or similar three-phase clusters. 

• Plan for space & logistics: These units are large and heavy; mounting surface, cooling/ventilation, service access must be considered. 

• DC and AC wiring must adhere to local codes/regulations; grounding/neutral configuration must be carefully done per manual. 

• Regular maintenance is required (e.g., residual-current device testing, surge arrester inspection) to ensure safe operation. 

Document: Specification Sheet