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Smartformer For Sunny Island

Split-phase stand-alone grids—now easier than ever


The Smartformer is the complete solution for off-grid and battery back-up systems up to 8 kW. It acts simultaneously as AC distribution and a 120 V/240 V autoformer. The autoformer provides step-up or step-down options to supply loads with 120 V and 240 V using a Sunny Island and a Sunny Boy, with high efficiency over the entire power spectrum. Thanks to the pre-wired bypass function, the PV system can be easily bridged via a robust switch for maintenance. The optimized transformer overload protection and a load shedding relay provide extra protection to the system. The Smartformer makes the stand-alone power supply simple and reliable.

 

Simple

  • Pre-wired AC distribution board
  • Fast installation and commissioning
Sunny Boy SMA Smartformer Inverter

Downloads

SMA Smartformer Datasheet

Complete

  • Bypass switch for direct grid operation
  • Load shedding relay to prevent deep battery discharge
  • Miniature circuit breakers for PV and load

Efficient

  • Maximum efficiency of 99%

Safe

  • UL certified
  • Optimized overload protection
  • 5-year standard warranty, extendable to 20 years
General data
Number of phases Split-Phase
Rated voltage 120 / 240 Vac
AC voltage range between L1 and N 102 V – 132 V
AC voltage range between L1 and L2 204 V – 264 V
Rated frequency 60 Hz
Dimensions (W / H / D) 610 x 610 x 235 mm
Weight 56 kg
Self-consumption (no-load operation) 19 W
Rated power transformer¹ 3.4 kVA
Max. efficiency / CEC efficiency 99 % / 98.8 %
Transformer AC power for 30 min¹ 4.4 kVA
Transformer AC power for 1 min¹ 8.8 kVA
Hookup access Knockout top: 2 x 3/4", 2 x 1", 2 x 1 1/4"
Knockout bottom: 5 x 3/4", 3 x 1", 3 x 1 1/4"
Connections for Sunny Island
Max. number and nominal voltage of Sunny Island 1 x 120 V (L1, N)
Rated power 5.8 kW
Current at rated values 48 A
Fuses 1
PV plant connection
Number of connections / rated voltage 1 x 240 V (L1, L2.N)
Rated power 9.6 kW
AC power in parallel grid operation 6 kW
AC current at rated values 40 A
Fuses 2
Load Connection
Number of connections / rated voltage 1 x 120/240 V
Rated power 7.2 kW
AC power at 40 °C 6.6 kW
Rated power / current between L1 and L2 6.7 kW / 28 A
Rated power / current between L1 and N 3.8 kW / 32 A
Rated power / current between L2 and N 3.4 kW / 28 A
Current at rated values 32 A, 28 A (with activated bypass: 2 x 48 A)
Fuse K40A (with activated bypass: K60A)
PV array connection
Number of connections / rated voltage 120 / 240 V (L1, L2, N)
Rated grid input power 11.5 kW
AC input current 48 A
Fuse 2
Ambient Conditions
Operating temperature range -25 °C … +60 °C
Humidity 0 –100 % (non-condensing)
Protection class NEMA Type 1
Certification and approval UL 1741
Features / function
Warranty: 5 / 10 / 15 / 20 years / ○ / ○ / ○
Integrated bypass for maintenance / load-shedding contactor / transformer protection ● / ● / ●
● Standard feature ○ Optional feature — Not available
Type designation SI-TB-BOX-10

SMA Sunny Boy Smartformer Diagram