Description
The SMA Sunny Tripower X STP 20-US-50 is an intelligent 20KW commercial string inverter featuring an integrated System Manager, three independent MPP trackers, and SMA ShadeFix string optimization for future-proof, maximum-yield commercial PV system design.
Key Features
- Integrated System Manager Monitors and controls up to 5 inverters with a maximum 150 kVA system capacity, featuring remote access via Sunny Portal powered by ennexOS and SMA Dynamic Power Control.
- Three Independent MPP Trackers Provides flexible array design with SMA ShadeFix string-level optimization and integrated I-V curve diagnostics for maximum energy yield.
- Advanced DC AFCI Arc-Fault Protection Certified to UL 1699B Ed. 1 with integrated SunSpec PLC signal for module-level rapid shutdown compliance in accordance with UL 1741:2021.
- SMA Smart Connected Monitoring Proactive monitoring and service solution reduces O&M costs and field service time, supported by the award-winning ennexOS energy management platform.
- High Corrosion Resistance IEC 61701 C5 corrosivity classification and Type 4X enclosure rating ensure reliable long-term performance in the harshest outdoor environments.
The STP 20-US-50 delivers 20,000W nominal AC output power at 97.5% CEC efficiency, accepting up to 30,000Wp DC array power across a 350–800V MPP voltage range with three independent MPP trackers at 24A maximum input current each. Its OptiCool variable-speed forced convection cooling maintains reliable thermal performance across a -25°C to +60°C operating range.
Certified to UL 62109-1, UL 1699B Ed. 1, UL 3741, and CAN/CSA 22.2 No. 62109-1:16/62109-2:16, and compliant with IEEE 1547:2018, UL 1741 SB, CA Rule 21, HECO Rule 14H, and ISO-NE, the Tripower X meets all major US grid interconnection requirements. Advanced grid support capabilities include Volt-VAr, Volt-Watt, Frequency-Watt, and Ramp Rate Control for full utility compliance.
Dual Ethernet ports, integrated WLAN, and SMA Modbus, SunSpec Modbus, and Speedwire data protocols are included as standard, alongside a multi-function relay, extension module slot, and 6 digital inputs for comprehensive system integration. A 10-year standard warranty with optional extensions of up to 20 years total provides long-term investment confidence.
Technical Specifications
| Specification | Details |
|---|---|
| Model | STP 20-US-50 |
| Nominal Output Power | 20,000W |
| Maximum Apparent Power | 20,000 VA |
| Maximum PV Array Power | 30,000 Wp |
| Maximum Input Voltage | 1000V |
| MPP Voltage Range | 350–800V |
| Minimum Input Voltage / Initial Input Voltage | 150V / 188V |
| Max Operating Input Current / Short-Circuit per MPP | 24A / 37.5A |
| Number of MPP Trackers / String Inputs per MPP | 3 / 2 |
| Nominal AC Voltage | 480V / 277V |
| AC Voltage Range | 244–305V |
| Maximum Output Current | 24A |
| Rated Grid Frequency / Range | 60Hz / 50–66Hz |
| Power Factor at Rated Power | 1 (adjustable 0.8 overexcited to 0.8 underexcited) |
| Output Phases / Line Connection | 3 / 3-(N)-PE |
| THD | <3% |
| CEC Efficiency | 97.5% |
| Topology | Transformerless |
| Cooling | OptiCool (forced convection, variable speed fans) |
| Operating Temperature Range | -25°C to +60°C (-13°F to +140°F) |
| Noise Emission (Typical) | 59 dB(A) |
| Enclosure Protection Rating | Type 4X (UL 50E) |
| Corrosivity Classification | IEC 61701 C5 |
| Max Relative Humidity | 100% non-condensing |
| Mounting | Vertical rack / wall mount to 15° from horizontal |
| DC Connection | Amphenol H4 Plus |
| AC Connection | Spring-cage terminal |
| Network Interfaces | Ethernet (2 ports), WLAN |
| Data Protocols | SMA Modbus, SunSpec Modbus, Speedwire |
| Dimensions (W x H x D) | 728 x 762 x 266 mm (28.7 x 30 x 10.5 in) |
| Weight | 77 lbs (35 kg) |
| Certifications | UL 62109-1, UL 1699B Ed. 1, UL 3741, CAN/CSA 22.2 No. 62109 |
| Grid Standards | IEEE 1547:2018, UL 1741 SB, CA Rule 21, HECO Rule 14H, ISO-NE |
| FCC Compliance | FCC Part 15 Class A |
| Standard Warranty | 10 Years |
| Optional Warranty Extension | +5 Years, +10 Years (max 20 Years total) |
Specs & Info