SMA Sunny Tripower X 50 STP 50-80 - 50 kW Inverter
SMA Sunny Tripower X 50 STP 50-80 is a 50 kW three-phase string inverter for commercial PV systems, with 5 MPPTs, 10 string inputs and 98.1% maximum efficiency.
It integrates System Manager, SMA ArcFix, ShadeFix, Smart Connected, Speedwire and IP65 protection.
SMA Sunny Tripower X 50 STP 50-80 is a 50 kW three-phase string inverter for commercial photovoltaic systems. It supports up to 75 kWp of PV modules, including bifacial and high-current modules, through five independent MPP trackers.
Why choose the Sunny Tripower X 50?
Five MPPTs with two string inputs each simplify arrays with different roof orientations. SMA ShadeFix improves yield under partial shading, while SMA Smart Connected supports early fault detection. The integrated System Manager can coordinate up to five subordinate devices and one energy meter through Sunny Portal powered by ennexOS.
STP 50-80 technical specifications
| Rated AC power | 50 kW |
| Maximum PV array power | 75 kWp STC |
| Maximum DC voltage | 1000 V |
| MPP voltage range | 200-850 V; 500-850 V at rated power |
| MPPTs and strings | 5 MPPTs, 2 strings per MPPT |
| Usable input current | 40 A per MPPT, 22 A per string |
| Rated/maximum AC current | 72.5 A / 79.5 A |
| Maximum/European efficiency | 98.1% / 97.7% |
| Protection rating | IP65, protection class I |
| Dimensions and weight | 680 x 717.5 x 332 mm; 50.5 kg |
| Communication | Ethernet, Wi-Fi, Speedwire, Modbus and SunSpec Modbus |
Integration and safety
SMA ArcFix detects and helps prevent electric arcs. Grid and insulation monitoring, DC reverse-polarity protection, DC type I+II and AC type II surge protection are integrated. The inverter connects to the SMA Commercial Energy Solution for storage, EV charging and energy management.
Where is this inverter used?
It is designed for three-phase commercial rooftops and ground-mounted PV plants that need flexible string design and centralized control. Final sizing must be performed by a qualified designer using the applicable grid rules and SMA planning data.
What is included?
- SMA Sunny Tripower X 50 STP 50-80 inverter
- Integrated System Manager and communication interfaces
- SMA ArcFix, ShadeFix and Smart Connected functions
- SMA installation and commissioning documentation
Frequently asked questions
How many PV strings can the STP 50-80 handle?
It provides 10 string inputs across five independent MPPTs, with two string inputs per tracker.
Is it suitable for high-current PV modules?
Yes. It supports up to 40 A usable current per MPPT and 22 A per string, subject to SMA voltage and short-circuit limits.
Can the integrated System Manager replace a Data Manager?
In systems up to 135 kVA it can coordinate up to five subordinate devices and one Energy Meter. Larger architectures may still require an SMA Data Manager M.
Which safety functions are integrated?
It includes SMA ArcFix, DC type I+II and AC type II surge protection, grid and insulation monitoring, and DC reverse-polarity protection.
Can it be installed outdoors?
Its IP65 rating and -25 to +60 °C operating range support suitable outdoor installations. A qualified professional must follow the SMA mounting instructions.
