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MPPT 300W Pure Sine Wave Micro Grid Tie Inverter for solar home system 

Place of Origin: Zhejiang, China (Mainland) 
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Product Detail

Model No.: SG300

MPPT 300W Pure Sine Wave Micro Grid Tie Inverter for solar home system
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MPPT 300W Pure Sine Wave Micro Grid Tie Inverter for solar home system



System Function :


  • directly connected to the solar panels (do not need to connect the battery)

Using precise MPPT function, APL functions, the inverter automatically adjust the solar panels of maximum output power,simply connect the solar panel to the grid inverters. Do not need to connect the battery.

  • AC 0 angle with high precision auto-detection

AC phase angle of 0 through isolation amplifier then input to the MCU for high-precision detection and analysis. The phase shift rate is less than 1%, thus achieve high-precision with phase modulation AC output together.

  • Synchronous High-frequency Modulation

In the process of the grid, usually adapt the same phase angle in parallel. (ie, When the two-phase alternating current total is equal to 0.Use switch to combination the two AC fusion) and the product is rectified AC half-frequency AC to 100Hz first, then the machine use the high frequency current in the circuit and semi-100Hz frequency alternating current generated combination, to achieve high-frequency modulation.

  • Pure Sine Wave Output

        Use SPWM directly to make pure sine wave output.

  • Automatic Sensing Function Solar Luminosity

Use the latest luminosity perception operation technology. The different illuminate angle and intensity of the solar panel will produce different current output. Use advanced CPU to operate the different illuminance and the data can be directly displayed on the LCD. Then you can visually see the sense of the strength of the sun unit. Used more convenient.

  • Power Automatically Locked (APL)

In different current fluctuations, we should use the MPPT function. When the MPPT function adjusted to the maximum power point, the product automatically powers locked in maximum power point, then  made the output power more stable.

  • Maximum Power Point Tracking (MPPT)

Because the current intensity and the voltage changes at any time, if there is no power point tracking, there will be a lot of problems. In the past time, usually adopt a solar controller, but this product uses high-precision MPPT operation power, automatic and immediate adjust the solar panels output power at the  maximum output point, then achieve a stable output purposes.

  • Automatically Adapt To Different Load Power Factor

Adapt to any of the power load.

  • Constant Current, Constant Power

This product is constant current, constant output power, without any overload, over-current phenomenon.

  • Automatically Shut Down When The Power Output Of a Fault

       When the city power system is in failure, the inverter will automatically turn off the output.


         Current Limit Protection

         Current limit

  • Stack Multiple Machines

       Multiple small power inverters in parallel can achieve large output power.

  • High-Frequency High Conversion Rate

Adapt high frequency converter, the output more efficient.


SGI-series models 300W 500W 800W 1000W
Recommend use solar panels 420Wp 620Wp 1050Wp 1250Wp
DC Maximum Input Power 400W 600W 900W 1200W
DC maximum voltage VpvDC30.2VDC
DC voltage range Vpv 10.5V~28VDC
Maximum output power factor 99%
Maximum input current 20A 30A 45A 65A
AC output power 300W 500W 800W 1000W
AC maximum output power 300W 500W 800W 1000W
Anti-voltage protection Fuse
AC standard voltage range 90~160VAC/190~262VAC
AC frequency range 55Hz~63Hz/ 45Hz-53Hz
THDI <5%
Phase <1%
Islanding protection VAC;f AC
Output short circuit protection Current-limiting
Show LED
Installation Wall hanging
Cooling Fan
Standby Power <2W
Night Power <1W
Ambient temperature range -25 °C~60°C

0~99%(Indoor Type Design)

Waterproof Indoor Type Design
Electromagnetic Compatibility EN50081.part1 EN50082.part1
Power System Disturbance EN61000-3-2 EN60950-1
Network test DIN VDE 1026
Certificate CE



Please read the below notes carefully before installation:


A) Make sure the open voltage and operation voltage is in the range of 10.5-28V, and we recommend the 18V rated voltage solar panel or 24V battery.

B) Make sure the inverter’s  AC voltage and frequency is the same with power grid voltage and frequency.

C)Installation inverter in the low humidity and well-ventilated place to avoid the inverter damp and overheating, And clear the inflammable and explosive materials around

E)Recommended to use 4AWG DC input cable that can handle more than 50A current.

F)DC input cable no more than 8M, because long DC cable will reduce the voltage from solar panel

  G)There must be a circuit breaker between solar power generation and power grid(show like

  like the “control switch” in figure 1). And there will be no load before the circuit breaker.

  H)Before connect all the connections, you must disconnect the utility power. After make sure 

  the all connections are right then connect the utility power.

  I)If you need to disconnect the mains switch when the solar power generation is in operation, 

  you must disconnect the control switch first(show like the “control switch” in figure 1).

  J)Avoid children touch or play the inverters, in order to prevent electric shock.

  K)Non-professional do not disassemble the inverter, only qualified serviceman can repair it.




Connection DC terminal:


Connect the solar panels positive terminal to inverter’s positive terminal, and negative to negative. And you must screw up the nut to avoid the bad contact. Show in figure 1:



Connection of AC terminal:


Before connect the inverter’s AC cable to the socket, you must disconnect the utility power. Then put the AC cable which has holes terminal into the inverter’s 3 feet port and the pin terminal

 Mr. Sophie

Tel: 86-577-57181685
Contact to this supplier

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Company Info

Wenzhou Sunuse Electric Technology Co., Ltd. [China (Mainland)]

Business Type:Manufacturer
City: Wenzhou
Province/State: Zhejiang
Country/Region: China (Mainland)

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