Sunny Tripower 125 (STP125-70) — 125 kW three-phase grid-tied inverter

Country: Germany · Model: Sunny Tripower 125 (STP125-70)

The Sunny Tripower 125 (STP125-70) three-phase grid-tied inverter is rated at 125 kW, has 12 MPP trackers and accepts up to 1,100 V DC. It goes into commercial and ground-mounted PV plants with a decentralized layout, scaling up to the megawatt range.

Power: 125 kW
MPPT: 12
Communication: Speedwire, Modbus
Protection: built-in ArcFix arc-fault switch

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Technical specifications

More from the manufacturer’s documentation
Power	125 kW
MPPT	12
Communication	Speedwire, Modbus
Protection	built-in ArcFix arc-fault switch
Max. PV array power	187,500 Wp
Max. input voltage	1,100 V
MPP voltage range	450–800 V at rated power; operating 180–800 V
Rated input voltage	600 V
Min. / start voltage	180 / 200 V
Max. current per MPPT / short-circuit current	30 / 40 A
Strings per MPPT	2 (24 inputs in total)
Nominal AC voltage	230 / 400 V; range 320–480 V
Grid frequency	50 Hz (45–65 Hz)
Rated / max. output current	181.1 / 181.1 A
Power factor	1; adjustable 0.8 overexcited to 0.8 underexcited
Total harmonic distortion	< 3%
Max. / European efficiency	98.4 / 98.1%
Dimensions (W × H × D)	1,020 × 795 × 360 mm
Weight	approx. 96 kg
Operating temperature	−30 °C to +60 °C
Noise emission	< 71.1 dB(A)
Topology	no galvanic isolation
Degree of protection	IP65
DC / AC connection	SUNCLIX / terminal lug up to 240 mm²
Interfaces	Ethernet (2 ports), Wi-Fi; SunSpec Modbus
AFCI standard	IEC 63027; I-V array diagnostics
Surge arresters	DC type I + II / AC type II
Protection class / overvoltage category	I / AC: III, DC: II
Control inputs	4 digital inputs for power limitation, 2 for fast stop; multifunction relay
Mounting	wall or rack mounting
Warranty	5 years (optional 10 / 15 / 20 years)
Standards	VDE-AR-N 4105/4110/4120:2018, EN 50549-1/-2:2018, EN 50549-10:2022, IEC 62109-1/-2, CEI 0-21 / CEI 0-16, G99, AS4777.2:2020
Customs codes (for reference)
HS code	8504.40
UKTZED code (Ukraine)	8504408800 (>7.5 kVA)
CN code (EU)	85044084

Specifications are taken from the manufacturer’s technical documentation. Updated 10/31/2026. Customs codes are for reference only; the final code is determined at customs declaration for the specific model.

Description

The high tracker count makes string layout easier on roofs with mixed orientation and shading. Each MPPT takes 2 strings on SUNCLIX connectors, 24 inputs in all, at up to 30 A per tracker. Full power comes at an MPP voltage of 450–800 V, and the unit starts from 200 V. A built-in ArcFix arc-fault switch opens the circuit when an arc appears, and the DC side also carries type I + II surge arresters. The output is 230 / 400 V at 181.1 A, with AC cable on lugs up to 240 mm². The IP65 enclosure weighs about 96 kg, mounts on a wall or rack and runs from −30 to +60 °C. Several of these inverters build up a plant without a central unit.

How to choose

The array behind an STP125-70 can reach 187,500 Wp, one and a half times the rating. Where the utility caps export, the 4 digital power-limit inputs and 2 fast-stop inputs come in handy. A smaller roof is better served by the Sunny Tripower X 60 at 50.5 kg with 5 MPPT, while a 1,500 V DC field fits the Sunny Highpower PEAK3 at 180 kW per unit.