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Sungrow SG125CX-P2
Sungrow

SG125CX-P2

125 kW Grid-tie Three-phase
Compare with closest alternative Datasheet PDF
Rated AC (kW)
125.00
Typical for its class
Euro eff. (%)
98.3
Weak · bottom 14%
MPPT
12
Strong · top 14%
Max DC (V)
1100
Typical · median 1100 V
Weight (kg)
93.0
Weak · bottom 18%
Warranty (yrs)
-
Not published

The Sungrow SG125CX-P2 series are three-phase grid-tie inverters designed for large commercial and industrial installations, prioritized for high energy yield and rapid string operation diagnostics. A key feature is their 12 independent MPPTs, providing significant design flexibility - simplifying the integration of fields with different orientations and tilts, while minimizing losses during partial shading or uneven module aging. Notable features include dynamic shading optimization and advanced service functions, such as Smart IV Curve Diagnosis and network event logging, facilitating remote O&M.

In practice, the high European efficiency translates to better performance under typical operating conditions in Poland, extending beyond laboratory settings. These inverters support monitoring via the iSolarCloud platform and common communication interfaces - depending on configuration, including WiFi or Ethernet. For safety, features include among others surge protection and arc detection (AFCI). Typical offers include a 5-year warranty and compliance certification meeting grid connection requirements.

Ranking

95 inverters from 100 to 500 kW
Metric This inverter Median Position in class Rank in class
European efficiency 98.3% 98.6% Weak · bottom 14% 47
MPPT trackers 12 10 Strong · top 14% 3
Max DC input voltage 1100 V 1100 V Typical 47
Weight per kW 0.7 0.6 Weak · bottom 18% 78
Warranty - 5 yrs Not published -
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Price offers

1 from shops we track
Shop Country Price Per kW Stock Offer updated
www.frexolaire.com France 4 057.20 € incl. VAT 32.46 €/kW In stock 1h ago Visit shop

Specifications

Open datasheet PDF
Rated AC power 125 kW Continuous output
Max apparent power 125.00 kVA
Phases Three-phase
Nominal AC voltage 400 V 320 V – 480 V
Max AC current 181.1 A
Grid frequency 50 Hz Range 45 Hz – 55 Hz / 55 Hz – 65 Hz
Power factor > 0.99 at rated power; adjustable 0.8 leading – 0.8 lagging
Harmonic distortion (THD) 3.0 %
Max DC input power 175.00 kW DC/AC ratio 1.40
Max DC voltage 1100 V Caps the string length
MPPT voltage range 180 to 1000 V
Start-up voltage 200 V
MPPT trackers 12 2 strings each
Max input current per MPPT 30.0 A Must exceed the panel's Imp
Max short-circuit current per MPPT 40.0 A Must exceed the panel's Isc
European efficiency 98.3 % Weighted across part loads
Max efficiency 98.5 % Best single operating point
Dimensions 795 × 1020 × 360 mm Height × width × depth
Weight 93.0 kg 0.7 kg per kW
Enclosure IP66
Cooling forced-air
Operating temperature -30 to 60 °C
Max humidity 100 %
Max altitude 4000 m
Interfaces BluetoothDisplay
Protocols RS485WLAN (optional)Ethernet (optional)Bluetooth (via app)
Protection AFCIDC switchSurge protection
Certifications IEC 62109-1EN/IEC 61000-6-1/2/3/4IEC 61727IEC 62116EN 50549-1/2UTE C15-712-1VDE V 0126-1-1VDE-AR-N 4105:2018VFR 2019NC RfGG99UNE 217002NTSCEI 0-21 2019CEI 0-16 2019NRS-097-2-1IEC 63027

Pros and cons

5 positive · 1 caution
What owners get
12 Independent MPPTs, 180-1000 V DC Input Range

The inverter features 12 MPPT trackers with a voltage range of 180-1000 V (maximum input 1100 V DC) and 2 strings per MPPT (24 inputs total). This enables array designs with mixed orientations and tilt angles without inter-string mismatch losses - a decisive advantage over units with 4-6 MPPTs that dominate older C&I projects.

98.3% European Efficiency / 98.5% Peak Efficiency

A European efficiency of 98.3% places this unit at the top of the 125 kW C&I segment, on par with premium-class Fronius and SMA models. This translates directly into higher annual energy yield under the variable irradiance conditions typical of the Polish climate.

IP66 Ingress Protection + C5 Anti-Corrosion Certification

IP66 ingress protection (resistance to powerful water jets) combined with a C5 anti-corrosion certification per ISO 12944 - the highest classification, covering industrial and coastal environments - allows installation in harsh industrial settings without the need for additional protective enclosures.

Smart IV Curve Diagnosis + AFCI + iSolarCloud

Online IV curve diagnosis (Smart IV Curve Diagnosis) reduces string fault localization time from hours to minutes without taking the system offline. Arc-fault circuit interruption (AFCI) detection mitigates DC-side fire risk. Integration with the iSolarCloud platform delivers full remote O&M capability - a standard requirement for larger C&I asset owners.

Tier-1 BNEF, Manufacturer Since 1997

Sungrow is consistently rated Tier-1 by BloombergNEF, a key bankability criterion for project financing. Over 27 years of operation (since 1997) and a global service network significantly reduce the risk of inadequate technical support and spare-parts availability over a 20-year investment horizon.

Trade-offs
87 kg Unit Weight - Logistical Requirements

At 87 kg and 1020×795×360 mm, the inverter requires a minimum two-person installation crew and often mechanical handling equipment on site. By comparison, the SolarEdge SE100K weighs approximately 54 kg. This may increase installation costs where site access is restricted - for example, commercial rooftops served by narrow stairwells.

Alternatives

All Sungrow inverters
Inverter Power Euro eff. MPPT Weight Difference
Sungrow SG125CX-P2 125 kW 98.3% 12 93.0 kg You are here
S5-GC125K-HV 125 kW 98.6% 10 91.0 kg -2 MPPT, 2.0 kg lighter
MAX 125KTL3-X LV 125 kW 98.4% 10 84.0 kg -2 MPPT, 9.0 kg lighter
SOFAR 125KTLX-G4-A 125 kW 98.3% 10 75.0 kg -2 MPPT, 18.0 kg lighter
S6-GC125K 125 kW 98.3% 10 96.0 kg -2 MPPT, 3.0 kg heavier
S6-GC125K-HV 125 kW 98.3% 10 96.0 kg -2 MPPT, 3.0 kg heavier
STP 125-70 (Sunny Tripower 125) 125 kW 98.1% 12 96.0 kg 3.0 kg heavier
MAX 125KTL3-X2 LV 125 kW - 8 84.0 kg -4 MPPT, 9.0 kg lighter
MAX 125KTL3-X2 MV 125 kW - 8 84.0 kg -4 MPPT, 9.0 kg lighter

About the SG125CX-P2 series

6 answered

These answers cover the whole series. Where a figure differs, the specification above is this model's own.

What is the European efficiency of the Sungrow SG125CX-P2 inverter and what does it mean in practice?
The SG125CX-P2 achieves a European efficiency of 98.3% and a peak efficiency of 98.5%. European efficiency is a more meaningful metric for real-world conditions in climates with variable irradiance throughout the year, as it accounts for partial-load performance rather than just peak values. In practice, this translates into measurably higher annual energy yields - particularly significant in commercial projects where several hundred additional kWh per year represent concrete financial savings.
Is the Sungrow SG125CX-P2 suitable for installations with modules mounted at different orientations or tilt angles?
Yes - the SG125CX-P2 series is purpose-built for exactly this scenario. The inverter features 12 independent MPPT trackers with a total of 24 string inputs, meaning each pair of strings can operate at its own individual maximum power point. In large-scale commercial installations where modules are distributed across roof sections with different azimuths or inclination angles, this architecture eliminates inter-string mismatch losses and significantly improves overall system performance.
What is the Smart IV Curve Diagnosis feature in the Sungrow SG125CX-P2 and does it assist with system maintenance?
Smart IV Curve Diagnosis is a built-in diagnostic function that automatically measures the current-voltage (I-V) characteristics of individual strings and compares them against a reference profile. Deviations from the expected curve indicate issues such as soiled modules, damaged cells, faulty connectors, or uneven panel degradation. The diagnosis can be performed remotely via the iSolarCloud platform, which substantially reduces service response times and lowers operations and maintenance (O&M) costs in commercial installations.
What is the standard warranty on the Sungrow SG125CX-P2 and can it be extended?
The standard manufacturer's warranty for the SG125CX-P2 series is 5 years. Sungrow, as a Tier 1 manufacturer headquartered in China with a global service network, offers extended warranty options - the process typically requires the company's details, the unit's serial number, and the desired extension period. For commercial projects, it is advisable to negotiate an extended warranty at the point of purchase, since a 125 kW inverter is a critical BoS component of the entire power plant.
Is the Sungrow SG125CX-P2 resistant to harsh environmental conditions such as rain, corrosion, and high humidity?
Yes. The inverter carries an IP66 ingress protection rating, providing complete protection against dust and powerful water jets. In addition, C5 anti-corrosion certification makes the unit suitable for deployment in chemically aggressive environments - such as coastal sites, industrial facilities, or agricultural installations where fertilizers are used. For climates characterized by frequent rainfall and significant temperature swings, this rating is an important factor in minimizing the risk of field failures.
What fire protection and electrical safety features does the Sungrow SG125CX-P2 include?
The inverter is equipped with Arc Fault Circuit Interruption (AFCI) detection, which identifies hazardous electrical arcs on the DC side that could otherwise lead to a fire - a critical safeguard in large installations with long DC wiring runs. It also incorporates Type I+II DC surge protection devices (SPDs) and a Type II AC SPD, protecting against both atmospheric and grid-induced voltage surges. A built-in DC switch completes the safety package, simplifying safe disconnection of the system during maintenance operations.
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