SMA STP 25-US-50 Sunny Tripower X String Inverter
SMA STP 25-US-50 Sunny Tripower X String Inverter
Delivery
Shipping disclaimer: US Solar Supplier works hard to offer the most competitive shipping rates possible. Shipping is auto calculated. If you have questions, let's work together directly! Please reach out to arrange case based logistics. Contact our team at sales@ussolarsupplier.com or by chat during business hours 9 am to 5 pm EST.
Payment
We offer multiple secure payment options for your convenience

SMA STP 25-US-50 Sunny Tripower X String Inverter
STP 25-US-50
Specifications
SMA STP 25-US-50 Sunny Tripower X String Inverter
The SMA STP 25-US-50 Sunny Tripower X String Inverter stands at the forefront of commercial PV system technology. Offering a combination of high efficiency, intelligent energy management, and flexible system design, this inverter is ideal for maximizing solar investment returns.
- Three MPP trackers with SMA ShadeFix optimization for enhanced design adaptability and yield.
- Integrated System Manager with ennexOS for streamlined monitoring and control.
- Comprehensive safety features including SunSpec PLC for rapid shutdown and advanced DC AFCI protection.
- Optimized energy production with proactive service through SMA Smart Connected.
- Future-ready design to accommodate system growth and evolving grid requirements.
Technology and Overview
Empowered by the ennexOS platform, the STP 25-US-50 delivers outstanding cross-sector energy management, offering efficiency and ease of use for commercial solar applications.
Installation and Compatibility Overview
This inverter's design ensures a smooth installation process. It is compatible with a wide variety of PV modules and system setups, providing flexibility for commercial projects.
Benefits and Applications Overview
With the STP 25-US-50, benefit from high operational efficiency, reduced costs, and robust monitoring and control, ideal for commercial solar energy systems.
Specifications
Specification | Value |
Model No. | STP 25-US-50 |
Maximum PV array power | 37500 Wp |
Maximum input voltage | 1000 V |
MPP voltage range | 430 V to 800 V |
Minimum input voltage / initial input voltage | 150 V / 188 V |
Maximum operating input current / short-circuit current per MPP tracker | 24 A / 37.5 A |
Number of independent MPP trackers / string inputs per MPP tracker | 3 / 2 |
Nominal output power | 25000 W |
Maximum apparent power | 25000 VA |
Nominal AC voltage | 480 V / 277 V |
AC voltage range | 244 V to 305 V |
Rated grid frequency / range | 60 Hz / 50 Hz to 66 Hz |
Maximum output current | 30 A |
Power factor at rated power / adjustable displacement | 1 / 0.8 overexcited to 0.8 underexcited |
Output phases / line connection | 3 / 3-(N)-PE |
Harmonics (THD) | < 3 % |
CEC efficiency | 98.0% |
Load rated DC disconnect | Standard feature |
Ground fault monitoring / grid monitoring | Standard feature |
DC reverse polarity protection / AC short-circuit protection | Standard feature |
All-pole sensitive residual-current monitoring unit | Standard feature |
Protection class / overvoltage category | I / III |
DC AFCI arc-fault protection | Standard feature |
SunSpec PLC signal for rapid shutdown | Standard feature |
DC surge protection type 2 / DC surge arrester type 1+2 | Optional feature |
Dimensions (W/H/D) | 728 mm / 762 mm / 266 mm (28.7 in / 30 in / 10.5 in) |
Device Weight | 35 kg / 77 lbs |
Operating temperature range | -25°C to +60°C (?13°F to +140°F) |
Noise emission (typical) | 59 dB(A) |
Topology / cooling concept | Transformerless / OptiCool (forced convection, variable speed fans) |
Enclosure protection rating | Type 4X (as per UL 50E) |
Corrosivity classification according to IEC 61701 | C5* |
Maximum permissible value for relative humidity (non-condensing) | 1 |
Mounting type | Vertical rack / wall mount to 15° from horizontal |
DC connection / AC connection | Amphenol H4 Plus / spring-cage terminal |
LED indicators (status / fault / communication) | Standard feature |
Network interfaces: Ethernet / WLAN | Standard (2 ports) |
Data protocols: SMA Modbus / SunSpec Modbus / Speedwire | Standard feature |
Multi-function relay / Extension module slot / Digital inputs | Standard feature (6 inputs) |
SMA ShadeFix string level optimization | Standard feature |
Integrated I-V curve diagnostics 1) | Standard feature |
Integrated Plant Control / Q on Demand 24/7 | Standard feature |
SMA Smart Connected (proactive monitoring and service support) | Standard feature |
Standard warranty | 10 years |
Optional warranty extensions (total warranty coverage cannot exceed 20 years) | +5 years, +10 years |
Certificates and approvals | UL 62109-1, UL 1699B Ed. 1, CAN/CSA 22.2 No. 62109-1:16 / 62109-2:16, PV Rapid Shutdown System Equipment in accordance with UL1741:2021 |
FCC compliance | FCC Part 15 Class A |
Grid interconnection standards | UL 1741 SB, IEEE 1547:2018, compliance to SRDs: CA Rule 21, HECO Rule 14H, ISO-NE |
Maximum number of supported inverters / energy meters | 5 / 1 |
Maximum system power PV inverters (nominal AC power) | 150 kVA |
Centralized commissioning of all devices in the system | Standard feature |
Remote parameterization of SMA devices | Standard feature (via Sunny Portal powered by ennexOS) |
SMA Dynamic Power Control (e.g. zero export / Volt-VAr) 2) | Optional feature |