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SAJ Grid Tied Inverter 50KW/ 3MPPT 3 Phase

Quick Overview

Industrial and Commercial three phase PV grid-connected inverters are mainly used in commercial rooftop PV grid system, to turn PV DC current into AC current for equipment in factories or sell to power grid. Suntrio Plus 25-60K is characterized with high efficiency, convenience in installing, stable and reliable. It’s preferred inverter for commercial PV investment.


Brand SAJ
Product Code ST-50
Warranty 5 Years
SKU: ST-50K Categories: , ,

SAJ Grid Tied Inverter 50KW/ 3MPPT 3 Phase

The SAJ 50K inverter comes in an on-grid three phase type. These are mainly used for commercial rooftop PV system integrated with grid type—which converts DC power into AC power used for the equipment in factories – can also sell this to the power grid. The SAJ 50K Solar Inverter basically comes with high efficiency, reliability, and stability features.

The highlighted features of this DC to AC inverter are;

  • It comes with a conversion efficiency of 98.5% while having a maximum efficiency of 98.8%.
  • The warranty given with this solar inverter model is extendable to 5 years.

Output/Input Efficiency

The output (AC) efficiency of this PV inverter is;

  • The given rated AC power is about 50000 VA – max value of it is 55000 VA.
  • Rated AC current voltage is 76.0 A – given max AC current is 80 Ampere.
  • It comes with a grid frequency of 50 Hz to 60 Hz.
  • This inverter has a nominal AC voltage ranging from 220/380, 230//400, 240/415 volts.
  • It gives an adjustable power factor of 0.8 leading to 0.8 lagging.

The input (DC) power ranges required in this model are;

  • The maximum DC power integrated in this model is about 60000 watts.
  • Whereas, the maximum DC voltage is 1000 volts.
  • This model gives the MPPT voltage range of 280 to 900 volts.
  • Nominal DC voltage integrated is 600 volts – start voltage is about 300 volts and minimum value it gives is 250 volts.
  • It comes with a maximum DC input current in PV1/PV2 type which ranges like 40/30/30 A.
  • There are 3 MPPT modules used in this model.
  • A DC switch is also integrated in this solar panel inverter.

Ease in Installation

This inverter model is convenient in its installation like they come with an aluminum case design, small in size and light weighted. It also has a DC combiner box which decreases the system overall cost. This inverter provides a separate area for maintenance due to which its repair becomes easier.

The dimensions of this inverter are 800 x 550 x 280 mm with the net weight of 68 kg. This inverter provides an altitude of 3000 m while working. The LCD display size is 3.5 inch with that screens data in English language.

Environment Suitability

This solar power inverter gives the operating temperature ranging from -25 degrees Celsius to +60 degrees Celsius with the ambient humidity ranging from 0 to 100% (non-condensing). It comes with an intelligent fan cooling method which prevents the inverter from overheating. Moreover, the consumption of this inverter at night is greater than 0.6 W – consumption at standby is about 10 or greater than 10 W.


This inverter model comes with a well-protected body and provides more protection through their intelligent features. It offers an internal over-voltage protection which prevents the inverter from over-burden or sudden switching off due to overheating. This also gives thermal protection, AC/DC surge protection, and AC short circuit current protection etc.


Technical Specification

Input (DC)
Max. DC power [W] 60000
Max. DC Voltage [V] 1000
MPPT Voltage Range [V] 280-900
Nominal DC Voltage [V] 600
Start Voltage [V] 300
Min. DC Voltage [V] 250
Max. DC Input Current PV1/PV2 [A] 40/30/30
Number of MPPT 3
Number Of DC Connections Sets per MPPT 4/3/3
DC Switch Integrated
Output (AC)
Rated AC Power [VA] (@230V,50Hz) 50000
Max. AC Apparent Power [VA] 55000
Rated AC Current [A] 76.0
Max. AC Current [A] 80.0
Nominal AC Voltage / Range 3/N/PE, 220/380V,  230/400V, 240/415V; 180V-280V/312V-485V
Grid Frequency / Range 50Hz, 60Hz/44Hz-55Hz,  54Hz-65Hz
Power Factor, Adjustable [cos φ] 0.8 leading ~ 0.8 lagging
Total Harmonic Distortion [THDi] <3% (at Nominal Power)
Feed-in 3L + N + PE
Max. Efficiency 98.8%
Euro Efficiency (at 600Vdc) 98.5%
MPPT Accuracy >99.5%
Internal Over-Voltage Protection Integrated
DC Insulation Monitoring Integrated
DCI / GFCI / Grid Monitoring Integrated
AC Short Circuit Current Protection Integrated
LVRT Integrated
Thermal Protection Integrated
AC Surge Protection Ⅲ (Integrated),Ⅱ (Optional)
String Current Monitoring Integrated
Anti-PID Module Optional
DC Surge Protection Ⅱ Optional
DC Fuse Optional
Anti-island Protection Monitoring AFD
DC Connection MC4/H4
AC Connection Terminal Block
LCD & LED Display 3.5 inch Graphic LCD Display
Display Language English
Communication Port 2*RS485 + 1*RS232
Communication Wi-fi / GPRS / Ethernet  (Optional)
General Data
Topology Transformerless
Consumption at Night [W] <0.6
Consumption at Standby [W] <10
Operating Temperature Range -25°C to +60°C (45°C to 60°C with Derating)
Cooling Method Intelligent fan
Ambient Humidity 0% – 100% Non-condencing
Altitude 3000m ( >2000m power derating)
Noise(DBA) <35
Ingress Protection IP65 (Indoor and Outdoor installation)
Mounting Rear Panel
Dimensions (H*W*D) [mm] 800*550*280
Net Weight [kg] 68.0
Standard Warranty  [year] 5 (standard) 10/15/20/25 (Optional)
Certificates IEC62109-1/2, IEC61000-6-2/3, IEC60068-2, IEC62116, IEC61717, VDE-AR-N 4105, AS4777.2, AS4777.3, C-TICK, CQC NB/T 32004, G83-2, G59-3, NBR 16149, NBR 16150, TF 3.2.1



Flexible and Efficient

  • Optimized global MPPT algorithm, MPPT efficiency higher than 99.5%
  • Three MPPT which are compatible to all kinds of solar roofs
  • Max. efficiency of 98.8%, European efficiency of 98.5%
  • Super wide input voltage range(180V-1000V), supporting various solar panels and string desings

Convenient Installation

  • Aluminium case design, smaller and lighter
  • Integrate DC combiner box, reduce system cost
  • Separate area for maintenance, easy and quick for repair

Smart and Easy to Use

  • One-button safety setting, easy configuration of all parameters
  • Built-in independent RTC chip, supporting data storage of 25 years
  • Integrated LCD graphical display, showing daily/monthly/yearly generation
  •  Integrated with the function of reactive power control & ZVRT, responds to power grid dispatching, energy management of grid
  • Integrate string current monitoring, monitor string working status

Safe and Reliable

  • IP65 protection for indoor and outdoor installation
  • Optional DC&AC surge protection, guarantee system safety
  • Optional Anti-PID module, protect panels from PID damage
  • Aluminum case design to enhance heat dissipation and prevent rust corrosion, prolong life time


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