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Brand: SMA
SMA Sunny Tripower 125 STP 125-70 Solar Inverter
Description
The SMA Sunny Tripower 125 (STP 125-70) is a three-phase string inverter that delivers 125 kW at 400 V AC from 12 independent MPP trackers. It is aimed at commercial and industrial rooftops and ground-mounted plants up to the megawatt range, where many string inputs and good shade tolerance matter more than central-inverter scale.
Twelve trackers for complex roofs and ground arrays
Each of the 12 MPP trackers has two string inputs (24 in total) and accepts up to 30 A usable current, so high-current modules can be connected without extra combiners. The inverter has no galvanic isolation, uses OptiCool cooling, is rated IP65 and works from -30 °C to +60 °C, which makes it suitable for outdoor wall or rack mounting in hot sites. A multifunction relay, four digital inputs for power limitation and two for quick stop help meet grid-operator requirements.
SMA lists several built-in functions: ShadeFix optimisation for partly shaded arrays, an ArcFix arc-fault circuit interrupter compliant with IEC 63027, I-V array diagnostics, DC type I plus II and AC type II surge arresters, and the Smart Connected monitoring service. Communication is by Ethernet (two ports), Wi-Fi, SMA Speedwire and Modbus, and the unit integrates with SMA commercial storage and charging systems.
Technical specifications
| Parameter | Specification |
|---|---|
| Model | Sunny Tripower 125, type STP 125-70 (material no. 3-125-1100-1-70) |
| Max. PV array power | 187,500 Wp STC |
| Max. input voltage | 1100 V |
| MPP voltage | 450 V to 800 V at rated power; rated input 600 V; range 180 V to 800 V (up to 1000 V possible with reduced power) |
| Min. / initial input voltage | 180 V / 200 V |
| MPP trackers / strings per tracker | 12 / 2 |
| Max. usable / short-circuit current per tracker | 30 A / 40 A |
| Rated AC power / apparent power | 125 kW / 125 kVA |
| Nominal AC voltage / range | 230 V / 400 V; 320 V to 480 V |
| Grid frequency | 50 Hz (45 to 65 Hz) |
| Rated / max. output current | 181.1 A / 181.1 A |
| Power factor | 1 at rated power; adjustable 0.8 overexcited to 0.8 underexcited |
| THD | Below 3 % at rated power |
| Max. / European efficiency | 98.4 % / 98.1 % |
| Dimensions (W / H / D) | 1020 mm / 795 mm / 360 mm |
| Weight | Approx. 96 kg (211.6 lb) |
| Operating temperature range | -30 °C to +60 °C |
| Protection / topology | IP65; no galvanic isolation; protection class I; AFCI per IEC 63027 |
| Connections | Sunclix DC connectors; AC terminal lug up to 240 mm² |
| Noise (max. at 1 m) | Below 71.1 dB(A) |
| Approvals (more on request) | AS4777.2:2020, CEI 0-21/0-16, EN 50549-1/-2:2018, EN 50549-10:2022, G99, IEC 62109-1/-2, VDE-AR-N 4105/4110/4120:2018 |
Selecting and ordering
Check the string layout against the 12 trackers: many short strings suit the 450 V to 800 V full-power window and the 30 A tracker limit, while very long strings approach the 1100 V maximum. Confirm the local grid code, the site temperature and the required monitoring interface before ordering. The manufacturer states a standard warranty of 5 years, with optional extensions. The nearest published alternative on our site is the SMA Sunny Tripower CORE1 STP 50-41, and the full range is in solar power.
Documents and quotation
The attached file is SMA’s English data sheet for the STP 125-70 (revision 12/2025). Tell us the plant size, string configuration and grid-code requirement and we will quote the matching model and accessories.
Datasheets & Documents
- Datasheet SMA Sunny Tripower 125 STP 125-70 datasheet (rev. 12/2025) Download
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About brand
Three-phase string inverters for commercial rooftops and carports are the part of the SMA program that contractors in the Gulf ask for most. SMA has built solar inverters and energy systems in Niestetal, Germany since 1981.
Seven Star LLC, an independent supplier in Muscat, lists the Sunny Tripower CORE1 STP 50-41 and sources SMA solar inverters and their accessories for PV projects in Oman on request.
SMA Sunny Tripower CORE1 STP 50-41 in brief
The STP 50-41 is a 50 kW transformerless three-phase inverter. SMA's datasheet gives it six independent MPP trackers with two string inputs each, a maximum DC input voltage of 1000 V, an IP65 enclosure and an operating temperature range of -25 to +60 °C. The CORE1 is a free-standing unit, so it is set on the roof or ground without a wall or rack behind it.
Ordering SMA inverters: what we need
Send the full type designation as printed on the nameplate (STP 50-41, not only "CORE1"), the grid voltage and frequency, the utility or grid-code requirement that applies in your GCC country, and any surge protection or communication options. For a replacement unit add the serial number or a nameplate photo. We check the code against SMA documentation and provide the manufacturer's datasheet and certificates on request.
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Frequently Asked Questions
How many MPP trackers and string inputs does the STP 125-70 have?
12 independent MPP trackers with 2 strings each, 24 string inputs in total, each tracker with up to 30 A usable current.
What is the AC output?
125 kW and 125 kVA at 400 V three-phase (3-N-PE), 50 Hz, with a rated output current of 181.1 A.
Which safety functions are built in?
The datasheet lists an arc-fault circuit interrupter compliant with IEC 63027, I-V array diagnostics, DC type I plus II and AC type II surge arresters and all-pole residual-current monitoring.
What is the operating temperature range?
-30 degrees C to +60 degrees C, with IP65 protection and OptiCool cooling.
Which data protocols are supported?
SMA Modbus, SunSpec Modbus and SMA Speedwire, over two Ethernet ports and Wi-Fi.
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