SMA solar inverter, white rectangular unit with LED indicators and brand logo, wall-mounted
SMA solar inverter, white rectangular unit with LED indicators and brand logo, wall-mounted

SMA STP 25-US-50 Sunny Tripower X String Inverter

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SMA solar inverter, white rectangular unit with LED indicators and brand logo, wall-mounted

SMA

SMA STP 25-US-50 Sunny Tripower X String Inverter

$5,490.04 $4,198.00
SMA solar inverter, white rectangular unit with LED indicators and brand logo, wall-mounted

SMA

SMA STP 25-US-50 Sunny Tripower X String Inverter

$5,490.04 $4,198.00
  • Description
  • Why Buy From Us

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

Why Choose Green Vista Living


At Green Vista Living, we’re passionate about providing top-quality renewable energy and eco-friendly products that not only enhance your life but also help protect the planet. We’ve built our business with one mission in mind: to be the go-to destination for renewable energy solutions, outdoor gear, and off-grid supplies. When you shop with us, you’re not just getting innovative products—you’re joining a community that’s committed to sustainability.

We Put Our Customers First


As a small, dedicated team, we care deeply about your experience. Unlike large, faceless online companies, Green Vista Living offers a personal touch in everything we do. We're here for you from start to finish—whether you need product advice, support after a purchase, or just have questions. Our knowledgeable customer service team is always just a phone call or email away, ready to assist you in any way possible.

We Share Your Passion for the Planet


Our love for the outdoors and sustainable living runs deep. Most of our team hails from the mountains of Colorado, where renewable energy and the environment are part of daily life. So when you call Green Vista Living, you’ll speak directly with an expert who understands both the technical side of renewable products and the lifestyle they support. Whether you’re looking for solar generators, EV chargers, or any of our eco-friendly offerings, you can trust us to guide you with expertise and passion.

Trusted Industry Experts


Our close partnerships with the best brands in renewable energy and outdoor gear give us insider knowledge that you won’t find anywhere else. We’ve taken the time to carefully select products that stand out for their quality and reliability. At Green Vista Living, we believe in understanding our products inside and out so that we can help you make the right choice with confidence.

More Reasons to Love Green Vista Living


Price Match Guarantee: Thanks to our partnerships, we offer the best prices around. If you find a better deal, we’ll refund the difference.


Free Shipping: We offer free shipping on most orders to the lower 48 U.S. states, making your shopping experience even easier.


100% Secure Ordering: Our site uses SSL Encryption technology to keep your payment and personal information safe and secure.


Volume Discounts: For large orders, we’re happy to provide special pricing—just reach out for a custom quote.


Authorized Dealer: As an authorized dealer for all our brands, you’ll receive full manufacturer warranties with every order.


At Green Vista Living, we aim to make your renewable energy and outdoor experience as seamless and enjoyable as possible. With our unmatched customer service, expertise, and dedication to quality, you can shop with confidence, knowing you’re supporting a company that’s as committed to the planet as you are.

Frequently Asked Questions

Yes! We provide free and fast shipping on MOST orders within the continental United States. However, some specific brands and items will require a quote. You can live chat or call us for a quote
Most orders ship out within 1–2 business days and arrive within 3–5 business days depending on your location.
We offer easy returns as long as your item meets the conditions outlined in our Return Policy. Items must be unused, in original packaging, and returned within the specified return window.
Absolutely! Our in-house product experts are here to help. Live chat or call us 513-743-829 for personalized advice before or after your purchase.
Yes. All products include any applicable manufacturer warranties, and we’ll help you handle any warranty claims if needed.
Yes, we only sell 100% authentic, brand-new products, sourced directly from our manufacturers or authorized distributors.

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