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Split-phase stand-alone grids—now easier than everThe 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
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 DownloadsSMA Smartformer Datasheet |
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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 |
