SMA · Home battery model
Sunny Island X 30 / 50
Sunny Island X is a modular 30 or 50 kW battery-inverter platform for commercial on-grid and off-grid systems using approved batteries.
Specifications
| Specification | Value |
|---|---|
| Model codes | SI30-20 and SI50-20 |
| Nominal power (kW) | 30 or 50 according to model |
| Application | commercial on-grid and off-grid battery systems |
| Battery compatibility | manufacturer-approved batteries only |
| Monitoring | Sunny Portal powered by ennexOS |
| Warranty (years) | 5 plus 5 after qualifying registration |
Sunny Island X is SMA’s newer commercial battery-inverter platform for on-grid and off-grid systems. The family comprises SI30-20 and SI50-20. SMA’s global documentation is current, but UK new-supply status was not confirmed in this review.
System role
Each Sunny Island X is a battery inverter, not a solar string inverter. It connects an approved battery to an AC system and can form part of a modular installation. An integrated DC-to-DC stage allows several approved third-party battery families, but compatibility still depends on SMA’s current battery list, battery-management communications and firmware.
For on-grid use without backup, the product can provide integrated energy management in a supported arrangement. Backup and off-grid designs are different. SMA says a Sunny Island X Connection Box is required to integrate a generator or utility grid in off-grid systems, while its backup accessory provides automatic transfer. Exact switching and system-controller requirements depend on the topology.
Scale and controls
The two model codes denote 30 and 50 kW classes. SMA confirms 50 kW at 400 V AC for the larger version. Larger systems can combine units under the specified SMA controller and connection-box architecture, but published maximums vary by application. They should be taken from the current planning documents rather than applied as a general parallel limit.
Sunny Portal powered by ennexOS provides system monitoring. Sunny Island X is not compatible with Sunny Home Manager 2.0 in the same way as a domestic SMA home system, and it cannot simply be mixed with the older Sunny Island 6.0H / 8.0H platform.
Warranty and project configuration
SMA states a ten-year arrangement made up of five years plus five after qualifying registration. A complete UK configuration identifies regional supply, approved batteries, model code, firmware, controller, connection box, ENA evidence and warranty terms.
Related entries
Brand
Reference type
Home battery model
Last reviewed
23 Jul 2026
Current status
UK new-supply status is unconfirmed.