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SMA SI-TD-BOX-10 > Smartformer for Sunny Island
SMA SI-TD-BOX-10 > Smartformer for Sunny Island

Our Price: $1,784.92
Warranty: 5 Years

Availability: Usually ships in 3 to 4 weeks. Call for availability.
Product Code: SMA-SI-TD-BOX-10

Description Data Sheet

SMA SI-TD-BOX-10 > Smartformer for Sunny Island

Set up Split-Phase Grids - Easier Than Ever

Transformer, control, and AC breaker box for allowing a single Sunny Island inverter to AC couple with a Sunny Boy grid tie inverter at 240VAC.
Load shedding and AC bypass are also included.


Model SI-TD-BOX-10 / Smartformer
Series Sunny Island
Manufacturer SMA Solar
Compatible With Sunny Island Inverters


Data Sheet SMA SI-TD-BOX-10 Smartformer

Detailed Description

The Smartformer is the complete solution for off-grid and backup plants of up to seven kilowatts. At the same time, it acts as a AC distributor and a 120/240-volt autotransformer. The transformer provides step-up and step-down options to supply loads with 120 V and 240 V using a Sunny Island and a Sunny Boy – with a high level of efficiency over the entire power spectrum. Thanks to the pre-wired bypass function, the PV plant can be bridged without problems via a robust switch for maintenance work. The optimized transformer overload protection and a load-shedding contactor provide extra protection to the system. The Smartformer makes the stand-alone power supply simple and reliable.


  • Pre-wired AC distribution board
  • Quick installation and commissioning
  • Suitable for SI 4548 / 6048-US


  • Bypass switch for direct grid operation
  • Load-shedding contactor to prevent battery deep discharge
  • Miniature circuit-breaker for PV and load


  • Max. efficiency: 99 percent
  • Highest yield in the entire power range


  • UL listed
  • Optimized overload protection
  • Warranty: 5 years as standard – extendable to 20 years

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