SMA Sunny Tripower X 25 (STP 25-50)25kW three-phase string inverter, 3 MPPT

Overview

The STP 25-50 is the largest Sunny Tripower X: 25kW three-phase, up to 37.5kWp of PV on three MPP trackers with two strings each, and a nominal-power MPP range of 430–800V. Output current is 36.2A per phase and European efficiency reaches 98.0%. It is listed with CEI 0-16 and CEI 0-21 as well as VDE-AR-N 4110, and integrates arc-fault protection, I-V diagnostics and the System Manager function in the same 35kg housing.

• 12, 15, 20 and 25kW three-phase
• Three MPP trackers, two strings each, 24A per tracker
• Up to 150% PV oversizing (37.5kWp on the X 25)
• Integrated System Manager for up to 135kVA
• AFCI and I-V generator diagnostics built in
• IP65, C5 corrosivity, OptiCool, 35kg

How it works

Sunny Tripower X is a transformerless three-phase string inverter for 3-(N)-PE grids at 220/380, 230/400 or 240/415V. Three independent MPP trackers each take two strings with 24A usable and 37.5A short-circuit current, so high-current modules can be used. The MPP range at nominal power starts at 210V on the X 12 and 430V on the X 25, up to 800V, with 1000V maximum input. Maximum PV array power is 150% of rated output on all four sizes.

Key features

The inverter can act as System Manager: with an energy meter it controls the grid connection point, manages up to five further Speedwire devices such as inverters, charging stations and meters, and supports systems up to 135kVA. SMA Dynamic Power Control handles zero export and Q(U), and Integrated Plant Control and Q on Demand 24/7 provide reactive power. An arc-fault circuit interrupter and I-V generator diagnostics are integrated, and type 2 or type 1/2 DC surge arresters are optional.

Installation and compatibility

The 728×762×266mm, 35kg housing is IP65, climate class 4K26 and C5 corrosivity rated to IEC 61701, cooled by the OptiCool fan system at a maximum of 59dB(A). DC uses SUNCLIX connectors and AC a spring-cage terminal. No external RCD is required; if local rules demand one, type A or B devices of 100mA or higher are compatible, one per inverter. Six digital inputs, a multifunction relay and an expansion slot are available, and the datasheet marks the inverter as off-grid capable.

Monitoring and grid codes

The ennexOS web interface is reached over local WLAN or two Ethernet ports, with SMA Modbus, SunSpec Modbus and Speedwire; RS485 is optional. Commissioning of all devices and remote parameter changes run centrally via Sunny Portal powered by ennexOS. Listed approvals include CEI 0-16/0-21:2019 & V1:2020, VDE-AR-N 4105 and 4110, EN 50549-1/-2 and -10, C10/11 LV and MV, G99 type A, TOR Erzeuger type A and UNE 217002. A 5-year warranty applies, extendable to 10, 15 or 20 years.

Questions and answers