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SMA Sunny Tripower X 50-US (STP 50-US-80) 50 kW Three-Phase Commercial String Inverter, 480 V
Original price was: $8,313.00.$5,999.00Current price is: $5,999.00.
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COMING SOON — Pre-order / availability to be confirmed. Contact CSE Solar USA for the current lead time before ordering.
SMA STP 50-US-80 (MPN 03-50-1000-2-80) — 50 kW three-phase transformerless string inverter for 277/480 V commercial PV systems. 5 independent MPP trackers with 2 string inputs each, SMA ShadeFix string-level optimization, integrated SunSpec rapid shutdown transmitter, DC AFCI arc-fault protection and the integrated SMA System Manager (ennexOS). CEC efficiency 97.5 %. 10-year SMA limited factory warranty, extendable to 15 or 20 years.
- Nominal AC power 50,000 W · max. apparent power 53,000 VA
- Max. PV array power 75,000 Wp STC · max. DC voltage 1000 V
- 5 MPPT × 2 strings · 40 A / 50 A per MPPT
- Type 4X enclosure · 117 lbs (53 kg)
Available on backorder
SMA Sunny Tripower X 50-US (STP 50-US-80): 50 kW commercial string inverter for 277/480 V three-phase systems
The SMA STP 50-US-80 (manufacturer part number 03-50-1000-2-80) is the 50 kW model of the Sunny Tripower X 70 family, SMA’s newest three-phase string inverter platform for commercial and industrial PV systems in the United States. It converts up to 75,000 Wp STC of PV array power into 50,000 W of three-phase AC at 480 V / 277 V (3-phase WYE), using 5 independent MPP trackers with 2 string inputs each, so installers can split rooftops with different orientations, tilts or module counts across dedicated trackers.
Key features
- 5 independent MPP trackers (2 strings each) for flexible array design and maximum yield
- Direct Staubli MC4 DC connections and screw-terminal AC connection, fewer components on the roof
- Rated for today’s high-power and bifacial modules: 40 A operating / 50 A short-circuit per MPPT
- SMA ShadeFix string-level optimization without module-level electronics
- Integrated SunSpec PLC rapid shutdown transmitter (NEC 690.12) and UL 3741 PV Hazard Control listing
- DC AFCI arc-fault protection (UL 1699B) with ground-fault and residual-current monitoring
- Integrated SMA System Manager powered by ennexOS: commissioning, monitoring and control of up to 5 inverters from one device, no external data logger required for small systems
- Sunny Portal powered by ennexOS remote monitoring, SMA Smart Connected proactive service and SMA Dynamic Power Control (zero export, Volt-VAr)
- Ethernet (2 ports) and WLAN on board; SMA Modbus, SunSpec Modbus and Speedwire protocols
- Type 4X enclosure, -13 °F to +140 °F (-25 °C to +60 °C) operating range, OptiCool active cooling, C5 corrosivity class
- Load-rated AC and DC disconnects integrated
- Integrated DC type 1+2 and AC type 2 surge protection
- 10-year SMA Limited Factory Warranty, extendable to 15 or 20 years
Commercial and EPC applications
- Large commercial rooftops using bifacial or 600 W-class modules, where 5 MPPTs and 1.5 DC/AC oversizing reduce inverter count
- Commercial and industrial rooftops (warehouses, distribution centers, manufacturing)
- Schools, municipal buildings and community facilities
- Retail centers, offices and multifamily properties
- Carports and ground-mount systems where multiple string inverters are combined
- Repowering of legacy string or central inverter systems (three-phase service)
Multiple Sunny Tripower X 70 inverters can be combined into larger plants: the integrated System Manager coordinates up to 5 inverters and one energy meter; larger systems use the SMA Data Manager M.
Technical specifications
| Manufacturer | SMA Solar Technology AG / SMA America, LLC |
|---|---|
| Product family | Sunny Tripower X 70 (27 / 50 / 62 / 70 kW) |
| Type designation | STP 50-US-80 |
| Manufacturer part number (MPN) | 03-50-1000-2-80 |
| Inverter type | Three-phase transformerless grid-tied string inverter (commercial) |
| Nominal AC output power | 50,000 W |
| Maximum apparent AC power | 53,000 VA |
| Nominal AC voltage | 480 V / 277 V (3-phase WYE) |
| AC voltage range | 244 V to 305 V |
| Maximum AC output current | 64 A |
| Rated grid frequency / range | 60 Hz (55 Hz to 65 Hz) |
| Output phases / line connection | 3 / 3-(N)-PE |
| Power factor at rated power / adjustable | 1 / 0.8 overexcited to 0.8 underexcited |
| Harmonics (THD) | < 3 % |
| Maximum PV array power | 75,000 Wp STC |
| Maximum DC input voltage | 1000 V |
| MPP voltage range | 500 V to 850 V (rated); 200 V to 1000 V operating |
| Minimum DC voltage / start voltage | 200 V / 250 V |
| Independent MPP trackers / strings per MPPT | 5 / 2 |
| Max. operating input current / short-circuit current per MPPT | 40 A / 50 A |
| CEC efficiency | 97.5 % |
| DC connection / AC connection | Staubli MC4 / Screw terminals |
| Disconnects | Load-rated AC and DC disconnects integrated |
| Surge protection | Integrated DC type 1+2 and AC type 2 surge protection |
| Arc-fault protection | DC AFCI arc-fault protection (UL 1699B) |
| Rapid shutdown | Integrated SunSpec PLC signal transmitter for module-level rapid shutdown; UL 3741 PV Hazard Control listed |
| Protection features | Ground-fault monitoring, grid monitoring, DC reverse-polarity protection, AC short-circuit protection, all-pole sensitive residual-current monitoring |
| Network interfaces | Ethernet (2 ports), WLAN |
| Data protocols | SMA Modbus, SunSpec Modbus, Speedwire |
| I/O | Multi-function relay, 4 digital inputs, 2 fast-stop inputs |
| Integrated System Manager | Up to 5 inverters / 1 energy meter; remote parameterization via Sunny Portal powered by ennexOS; SMA Dynamic Power Control (zero export / Volt-VAr) |
| Monitoring and service | SMA Smart Connected proactive monitoring; SMA ShadeFix; integrated I-V curve diagnostics (available from Q4/2026 per SMA datasheet) |
| Dimensions (W x H x D) | 26.8 in x 36.6 in x 13.1 in (680 mm x 930 mm x 332 mm) |
| Weight | 117 lbs (53 kg) |
| Operating temperature range | -13 °F to +140 °F (-25 °C to +60 °C) |
| Noise emission (typical) | 55 dB(A) |
| Enclosure rating | Type 4X (UL 50E) |
| Corrosivity class (IEC 61701) | C5 |
| Cooling | OptiCool forced convection with variable-speed fans |
| Mounting | Vertical rack or wall mount, up to 20° from horizontal (roof mounting requires Roof Mount Kit 210462-00.01 plus Roof Mount Adapter RM-ADP-STP-80) |
| Certificates and approvals | UL 1741, UL 62109-1, UL 1699B Ed. 1, PV Rapid Shutdown System Equipment per UL 1741:2021, UL 3741, UL 1998 |
| Grid interconnection standards | UL 1741 SB, IEEE 1547:2018, CA Rule 21, HECO SRD V2.0 |
| FCC compliance | FCC Part 15 Class A |
| Standard warranty | 10 years SMA Limited Factory Warranty (USA); optional extensions +5 / +10 years, total not exceeding 20 years |
Specifications from the official SMA datasheet (STPxx-US-80-DS-en_us-10, last revision 05/2026). Data at nominal conditions; subject to change by SMA. Always confirm against the current datasheet before design.
Installation and application notes
- Mounting: Vertical rack or wall mount, up to 20° from horizontal (roof mounting requires Roof Mount Kit 210462-00.01 plus Roof Mount Adapter RM-ADP-STP-80).
- DC wiring: Staubli MC4 connectors; AC wiring: Screw terminals.
- Rapid shutdown: the inverter transmits the SunSpec PLC keep-alive signal; pair with SunSpec-certified module-level shutdown devices such as the SMA JMS-FA rapid shutdown device (sold separately).
- Commissioning and monitoring through the integrated System Manager web interface or the SMA 360° app; system registration in Sunny Portal powered by ennexOS.
- Grid support functions per UL 1741 SB / IEEE 1547-2018 including CA Rule 21 profiles; see the SMA derating and grid-management technical information for high-temperature and high-altitude operation.
What’s included
Inverter with mounting bracket and documentation package as supplied by SMA America. Refer to the SMA quick reference guide for the current scope of delivery; DC connectors and accessories are listed in the official documentation.
Optional accessories (SMA part numbers)
- SunSpec certified rapid shutdown device JMS-FA
- Roof Mount Kit 210462-00.01 + Roof Mount Adapter RM-ADP-STP-80
- DC terminal cover DC-COVER-STP-80
- SMA Data Manager M EDMM-US-20
Warranty
Covered by the SMA Limited Factory Warranty: 10 years for -US Sunny Tripower model types installed in the United States (5 years if installed outside the USA), starting at first commissioning or the invoice date. Optional ACTIVE / COMFORT warranty extensions of +5 or +10 years are available from SMA (total coverage cannot exceed 20 years). Source: SMA Limited Factory Warranty COM-RES-GB-en-88, effective for purchases after 2026-05-20.
Official SMA downloads
- Datasheet
- Quick reference guide (EN/ES/FR)
- Quick installation guide
- SMA Limited Factory Warranty
- Efficiency and derating (technical information)
- ennexOS user manual
- Grounding of PV inverters (technical information)
- Manufacturer product page
- Warranty extension
Related SMA Sunny Tripower X models
- SMA Sunny Tripower X 13-US (STP 13-US-50) — 13 kW, 120/208 V, 3 MPPT
- SMA Sunny Tripower X 20-US (STP 20-US-50) — 20 kW, 277/480 V, 3 MPPT
- SMA Sunny Tripower X 25-US (STP 25-US-50) — 25 kW, 277/480 V, 3 MPPT
- SMA Sunny Tripower X 30-US (STP 30-US-50) — 30 kW, 277/480 V, 3 MPPT
- SMA Sunny Tripower X 27-US (STP 27-US-80) — 27.5 kW, 120/208 V, 5 MPPT
- SMA Sunny Tripower X 62-US (STP 62-US-80) — 62.5 kW, 277/480 V, 5 MPPT
- SMA Sunny Tripower X 70-US (STP 70-US-80) — 70 kW, 277/480 V, 5 MPPT
See also the SMA brand page for the CORE1 and Sunny Highpower PEAK3 series and SMA residential hybrid inverters.
Frequently asked questions
When will this model be available?
This is a newly released SMA model. CSE Solar USA is accepting pre-order inquiries; availability and lead time are confirmed by SMA and will be posted here. Contact CSE for the current status.
What grid voltage does the SMA STP 50-US-80 connect to?
It is designed for 480 V / 277 V (3-phase WYE) three-phase WYE service. For 120/208 V commercial service, SMA offers the STP 27-US-80.
How many strings can I connect?
5 MPP trackers with 2 string inputs each (10 strings total), up to 40 A operating current and 50 A short-circuit current per tracker.
Does it include rapid shutdown?
The inverter integrates the SunSpec PLC rapid shutdown transmitter and is UL 3741 PV Hazard Control listed. Module-level shutdown devices are purchased separately.
Do I need a separate data logger?
No for systems of up to 5 inverters: the integrated SMA System Manager (ennexOS) handles commissioning, monitoring and power control. Larger plants use the SMA Data Manager M.
What is the warranty?
10 years SMA Limited Factory Warranty in the USA, extendable to 15 or 20 years through SMA.
Is this the current model?
Yes. STP 50-US-80 is listed by SMA America as a current Sunny Tripower X 70 model (datasheet revision 05/2026).
Project and EPC pricing
CSE Solar USA supplies SMA commercial inverters to installers, EPCs and developers nationwide with pickup at 10+ locations or freight to the job site. For multi-unit orders, complete commercial equipment packages or container-scale procurement, request EPC / project pricing. Browse all commercial inverters and the SMA brand page.
| Weight | 117 lbs |
|---|---|
| Dimensions | 13.1 × 26.8 × 36.6 in |
| MPN | 03-50-1000-2-80 |
