SMA Sunny Tripower X 25 STP 25-50 Three-Phase Solar Inverter

Overview

The SMA Sunny Tripower X 25 (type STP 25-50) is a 25 kW three-phase PV inverter for commercial buildings and large homes, and the top model of a family that also includes the Sunny Tripower X 12, X 15 and X 20. What sets the SMA Sunny Tripower X 25 apart from a conventional string inverter is its integrated System Manager function: one unit can monitor and control up to five SMA inverters (up to 135 kVA) and one energy meter, with direct access to Sunny Portal powered by ennexOS. For a small commercial plant this removes the need for a separate data logger or plant controller.

Seven Star LLC supplies the SMA Sunny Tripower X 25 and the wider Sunny Tripower X range in Oman and across the GCC, with engineering support in Muscat. Building owners and contractors looking for a solar inverter in Muscat for villas, offices, clinics, schools or small factories often need between 25 kW and about 125 kW of PV, which is exactly the size where one SMA Sunny Tripower X 25 acting as system manager plus up to four further inverters keeps the design simple and the monitoring in one place.

Operating Principle of the SMA Sunny Tripower X 25

In general terms, a transformerless three-phase inverter converts PV direct current into grid-synchronised alternating current while maximum power point tracking keeps each group of strings at its best operating voltage. The SMA Sunny Tripower X 25 has three independent MPP trackers with two strings each, a maximum input voltage of 1000 V and a wide MPP range of 150 V to 1000 V, with a rated input voltage of 580 V and a start voltage of 188 V. At nominal power the MPP range for the X 25 is 430 V to 800 V. Each tracker handles up to 24 A of usable input current and 37.5 A short-circuit current, which SMA highlights as suitable for the latest high-power PV modules with large cell formats.

The System Manager role is what makes the SMA Sunny Tripower X 25 a controller as well as a converter. With an energy meter at the grid connection point, the inverter can perform dynamic closed-loop control of active and reactive power, for example to limit export to a value required by the utility, across all inverters it manages. SMA ShadeFix optimises MPP tracking when parts of the array are shaded, I-V generator diagnostics help detect string problems from the portal, and SMA ArcFix, the integrated arc-fault circuit interrupter, detects electric arcs and can reduce fire risk.

Engineering Design of the SMA Sunny Tripower X 25

The SMA Sunny Tripower X 25 is a wall-mounted unit measuring 728 mm wide, 762 mm high and 266 mm deep and weighing 35 kg. The enclosure is IP65 to IEC 60529, climatic category 4K26 and corrosivity class C5 according to IEC 61701, which is relevant for coastal installations. Operating temperature range is −25 °C to +60 °C, maximum noise at 1 m is 59 dB(A) and night consumption is below 5 W. The OptiCool cooling concept and the enclosure design are intended to keep electronic components cool and extend service life. DC strings land on SUNCLIX connectors and the AC side uses spring-cage terminals.

The AC output of the SMA Sunny Tripower X 25 is 25000 W rated power and 25000 VA rated and maximum apparent power at 230 V, 50 Hz, three-phase 3-(N)-PE, with rated output current 36.2 A and maximum 36.6 A. Nominal voltages of 220/380 V, 230/400 V and 240/415 V are supported, frequency 50 Hz or 60 Hz, and power factor is adjustable from 0 overexcited to 0 underexcited with THD below 3 %. Interfaces include two Ethernet ports, local WLAN with about 10 m free-field range and optional RS485 client, with SMA Modbus, SunSpec Modbus and Speedwire protocols, a multi-function relay, one expansion slot and six digital inputs, for example for a ripple control receiver.

Key Features

SMA lists the following capabilities for the SMA Sunny Tripower X 25 in its datasheet.

• The integrated System Manager monitors and controls up to five SMA inverters with a total of 135 kVA plus one energy meter.
• Direct connection to Sunny Portal powered by ennexOS allows commissioning and monitoring of the whole plant centrally.
• SMA ArcFix provides arc-fault detection, and optional type 2 or type 1/2 DC surge protection can be installed.
• Three MPP trackers with 24 A usable input current per tracker suit modern high-current PV modules.
• SMA ShadeFix and I-V generator diagnostics increase yield and simplify troubleshooting of strings.
• Integrated Plant Control and Q on Demand 24/7 support reactive power requirements around the clock.
• The C5 corrosivity classification and IP65 enclosure suit demanding outdoor and coastal locations.
• The modular design allows expansion for future energy management functions, and the inverter is off-grid capable.

Industrial Applications

Typical projects for the SMA Sunny Tripower X 25 in Oman include rooftop systems on office buildings in Muscat, villas and residential compounds, private schools and clinics, light-industrial units in Rusayl and Sohar, and fuel station canopies. Because one inverter can act as system manager for up to five units, a 50 kW to 125 kW plant can be built from a mix of X 12 to X 25 models while still offering a single point for export limitation and monitoring, which is useful where the electricity supply company sets an export cap for the connection.

The corrosion class C5 rating is relevant for sites along the Batinah coast, in Sur or in Salalah where salt-laden air affects outdoor electrical equipment. Seven Star LLC supplies the SMA Sunny Tripower X 25, energy meters and SMA accessories for these applications and helps engineers in Oman and the GCC with inverter selection, string configuration and the document packages required for utility approvals.

Technical Specifications

The values below for the SMA Sunny Tripower X 25 are taken from the SMA Sunny Tripower X datasheet.

Related Products

For complete PV and backup power systems, buyers also compare the Schneider Electric Conext SW hybrid inverter, the APC SMX120BP external battery pack for UPS runtime extension and EnerSys PowerSafe SBS EON VRLA batteries for DC standby.

How to Order

To receive a quotation for the SMA Sunny Tripower X 25 or other Sunny Tripower X models, send Seven Star LLC your PV array size, module type, roof layout and grid export requirements. The SMA datasheet can be downloaded from this page, and our engineers in Muscat can propose the right combination of inverters and energy meter. Seven Star LLC supplies SMA inverters with engineering support throughout Oman and the GCC.