Maximum profitability

The M125HV Inverter has a peak efficiency of 99.2% and has built-in and replaceable AC and DC-side Type 2 SPDs (surge protection devices). Type 1 SPDs can be installed optionally.  Maximum apparent power 140 kVA / 125 kW active power. Modular fan section with smart fan control gives unit full power operation up to 50°C ambient. Only 3 wires needed for AC connection (IT Mode).  

Flexible applications

Suitable for 600V AC Grid voltage, Al or Cu AC cables are easy to install (multi-conductor cables or single conductor cables thanks to optional AC plate) and within 50mm2 up to 185mm2. 20 pairs of H4 UTX 4/6mm2 connectors for DC connection with individual string fused inputs and individual current monitoring. 1 MPP tracker with a high operating input voltage up to 1500V. Compatible with Sunspec protocol.

Cost advantages

Compared to a central inverter, the M125HV string inverter will not require additional string combiner boxes. Because of the relatively low weight, pickup trucks and simple lifting devices are sufficient for transport and lifting the unit at the installation site.

State of the art features

To avoid negative effects from PID (Potential Induced Degradation) on your solar modules, Delta M125HV features an integrated anti-PID solution. Q at night feature provides reactive power to the grid even outside normal feed-in periods, thereby implementing a healthy system. IV Curve measurements are supplied by the inverter to help in performance analysis of your PV system. 

Convenient easy-access doors

Convenient and separate AC compartment with easy access doors make installation easier. Features built-in Type 2 AC and DC SPDs certified to protection class II. Type 1 SPDs can be installed optionally. Chassis is wall-mountable or ground-mountable with protection class IP65.

Technical Data

Input (DC)
Nominal power 129kW / 600 VAC 
Voltage range 860...1500 
Full power MPP range 860...1450 1) 
Max. current 150 A 
Max. number of MPP trackers
Output (AC)
Nominal apparent power 125kVA 2) 3)
Voltage range  600 V -36% ... +15% 4)   3 phase + PE (Δ)
Nominal frequency 50 / 60 Hz 
Frequency range 50 / 60 Hz ± 5 Hz 4)
Power factor adjustable 0.8 cap ... 0.8 ind (1 ... 0.9 at maximum power) 
Total harmonic distortion (THD) < 3% @ nominal apparent power 
General Specification
Model name  M125HV_110
Part number Delta RPI124M110000 
Max. efficiency  99.0 %
Efficiency EU  98.6 %
Operating temperature -25 ... +60 °C 
Full power without derating -25 ... +50 °C 
Storage temperature -25 ... +60 °C 
Humidity 0...100% non-condensing 
Max. operating altitude 3000 m (above sea level) 
Dimensions / connections
Size (H x W x D) 663 × 940 × 334 mm 
Weight 80 kg 
Cooling Fans with removable fan module 
AC connector AC cable within 50 mm2 up to 185 mm2 (Cu or Al wire) terminated with ring terminator nut, M10 nut for  connection 
DC connector  20 pairs of H4 UTX 4/6mm2 connectors
Communication interfaces  RS485, Sunspec
DC disconnector  2 x integrated mechanical DC disconnectors
Display 3 LEDs, Data visualization via gateway / commission-ing software 
Safety / Standards
Protection degree IP65 
Safety class
Configurable trip parameters Yes 
Insulation monitoring Yes 
Overload behavior Current limitation, power limitation 
Anti-islanding protection / Grid regulation UTE C15-712 ERDF-RES-PRO_64E, VDE-AR-N 4110 
EMC EN61000-6-2, EN61000-6-3, EN61000-3-11, EN61000-3-12 
Safety IEC62109-1 / -2, CE compliance 

1) Ambient: < 0 °C : 860...1450 V, < 25 °C : 860...1350 V or < 40 °C : 860...1250 V

2) Maximum Apparent Power / Active Power: 140 kVA / 125 kW

3) Cos Phi = 1 (VA = W)

4) AC voltage and frequency range will be programmed according to the individual country 


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