Low Frequency Off-Grid Solar Inverter integrates a solar inverter, AC charger, and MPPT solar controller. It sources power from solar panels and the grid.

LF inverters, with larger transformers and lower frequency operation, are suited for large installations and unstable power areas. Benefits include durability, handling large loads, stable performance with unstable grids, and heat resistance.

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SF-WF 0.7-40KW​
SX-LF Series 24/48V 1-6KW

0.7-40Kw Inverter Output丨Intelligent LCD display丨220V version

SX-WF Series 12V-384V 0.7-40KW​

0.7-40Kw Inverter Output丨12/24/48/96/192V Battery voltage丨Intelligent LCD display

SX-DP Series 12/24/48V 1-7KW

1-6Kw Inverter Output丨220V version丨110V and 220V split phase output

Product Compare List

Model NO

SX-WF 0.7Kw-40KW

SX-DP 102
SX-DP 152
SX-DP 202
SX-DP 302
SX-DP 402
SX-DP 502
SX-DP 602
SX-DP 702

SX-LF 102
SX-LF 152
SX-LF 202
SX-LF 302
SX-LF 402
SX-LF 502
SX-LF 602

Key Feature
  • Upto 40KW Pure Sine output
  • Toroidal low-loss transformer
  • Wide PV input voltage range(150V-800V)
  • Work with wide battery voltage( 12V-384V )
  • Support diesel and gasoline generator
  • Price is most competitive
  • RS485/Mobile app optional
  • Wall-mounted installation
  • Toroidal low-loss transformer
  • Colling fan in intelligent control
  • Integrated and external LCD display
  • RS485/Mobile app optional
  • Split phase Function
  • 120V and 220V output at same time
  • Three timers peak power
  • Toroidal low-loss transformer
  • RS485/Mobile app optional
AC input Voltage (AC)



120V+240v Split phase

Battery Voltage




Output power




Output Voltage (AC)



120/240v Split phase

Max pv input Power

12V (0.42KW) 24V (0.84KW) 48V (1.68KW)

24V (1.68KW) 48V (3.36KW) 96V (6.72KW)

48V (5.6KW) 96V (6.72KW)

48V (5.6KW) 96V (11.2KW) 192V(11.2KW)

192V(11.2KW*2) 240V(14KW*2) 384V(22.4KW*2)

12V (0.84KW)
24V (1.68KW)
48V (3.36KW)

12V (0.42KW)
24V (0.84KW)
48V (1.68KW)

12V (0.84KW)
24V (1.68KW)
48V (3.36KW)

48V 5KW : 6KW
48V 6KW : 5.6KW

Max pv input voltage (DC)

12/24V:120V 48V:180V 96V:280V
192V:450V 240V:500V 384V:800V



MPPT operating voltage range(DC)

12V (15-80V) 24V (30-100V) 48V (60-140V)
96V (120-220V) 192V (240-360V) 240V (300-400V) 384V (480-640V)

12V (15-120V)
24V (30-120V)
48V (60-120V)

12V (15-80V)
24V (30-100V)
48V (60-140V)

MPPT Charging Current (A)

0.7KW-1KW :30A

2KW-4KW :60A

5KW-6KW: 48V100A 96V60A

7KW-12KW: 48V:100A 96V:100A 192V:50A

15KW-40KW :100A


1KW-1.5W: 30A
2KW-4KW: 60A
5KW-6KW: 100A

Why choose our inverter?

We provide the best service & solar inverters.

Everything you need to know about low Frequency off grid solar inverter

What is Low Frequency Off grid solar inverter?

Sunflx Low Frequency Off grid solar inverter is a combination of Solar inverter , AC charger and MPPT Solar Controller. it can draw power from both solar panel and grid to supply electricity to load.

Function converting the Direct Current (DC) from solar panels into Alternating Current (AC), the form of electricity used in most homes and businesses

LF inverters are characterized by their robust build, using larger transformers and operating at a lower frequency. They are well-suited for larger installations and environments with fluctuating power supply.

Low Frequency inverter advantage is :

How it works ?

Off grid solar power system is when your solar panel remains connected to the grid and also has a backup battery system to store power produced by the solar panel. Off grid solar power System includes: Solar Panel, off-grid solar inverter, Backup battery, and accessories.

In the daytime, the solar panel will generate electricity for household load, at this time, inverter will charge the battery .

In the Night, The inverter will take power from the battery to supply household appliances. When the battery power is low, the Grid will continue to supply electricity to the load from inverter bypass circuit. and at this time you can also choose to charge the battery from Grid through the inverter.

What is the Difference between High-Frequency (HF) and Low-Frequency (LF) Solar Inverter ?

You can understand the Main Difference from the below Four points :

• Power Handling: HF inverters are suited for smaller, less demanding applications,while LF inverters excel in handling larger and more challenging tasks.

• Efficiency: HF inverters are more efficient in cooler climates or less demanding environments, whereas LF inverters are preferable in tougher conditions with heavier loads.

• Size and Installation: HF inverters are more compact and easier to install in limited spaces. LF inverters require more installation space and sturdy mounting.

• Maintenance: LF inverters are generally more durable and require less maintenance over time, especially in harsh conditions.

For more detail explanation , Please Read this Articte


Application Areas:
Remote Locations: Ideal for areas without grid access or with frequent power outages. Like Rural Homes and Farms ,Mountain Cabins and Retreats,Island houses ,Eco-Tourism Facilities,Mobile Clinics and Schools,Outdoor Recreational Activities etc.

Residential/Commercial Use: Suitable for homes or businesses needing a reliable power source.

Application Load:
Below Loads are suggested to use Low-Frequency Solar Inverters instead of High-Frequency ones:
• Heavy-Duty Power Tools (e.g., saws, drills, industrial sanders)
• Large Heating Systems (e.g., electric furnaces, industrial heaters):
• Commercial Kitchen Appliances (e.g., industrial ovens, dough mixers)
• Large-Scale Laundry Equipment (e.g., commercial washing machines, dryers
• Welding Machines
• Air Compressor
• Pumping Systems for Water Treatment and Distribution
• Industrial Refrigeration Systems
• Large-Scale Audio/Visual Systems

What is the main component of Low Frequency off grid solar inverter ?



- What It Is: Think of the transformer as a big, heavy device inside the inverter.
- Function: Its job is to adjust the voltage levels. For instance, it can convert the low voltage from your solar panels or batteries to a higher voltage that's suitable for home appliances.
- Why It's Important: Without the transformer, the electricity generated wouldn't be compatible with your everyday devices like fridges or TVs.


Battery Charger:

- What It Is: This is a part of the inverter system that specifically deals with charging the batteries.
- Function: When there's access to an AC power source (like from a generator or the grid), this charger replenishes your batteries.
- Why It's Important: It ensures your batteries are always charged when solar energy is low, like during the night or on cloudy days.


Inverter Unit:

- What It Is: The heart of the system. Function: It converts Direct Current (DC) from your solar panels or batteries into Alternating Current (AC), which is the type of electricity used in homes and businesses.
- Why It's Important: Most of our appliances need AC power, so this conversion is crucial for making the solar power usable.


Control Circuitry:

- What It Is: This is the brain of the inverter.
- Function: It controls how power flows through the system, manages the charging of the batteries, and ensures the inverter operates safely and efficiently.
- Why It's Important: Good control circuitry means better performance, longer life for your batteries, and overall safer operation.


Cooling System:

- What It Is: This includes fans or heat sinks (metal parts that disperse heat) inside the inverter.
- Function: They prevent the inverter from overheating during operation.
- Why It's Important: Overheating can damage the inverter and reduce its lifespan. Proper cooling ensures it runs efficiently for a longer time.


Display Panel :

- What It Is: A screen or interface on the inverter.
- Function: It shows important information like battery levels, current power output, and any alerts.
- Why It's Important: It lets you monitor the system's performance and alerts you to any issues that need attention.

How to choose the right off grid inverter ?


Determine Your Power Requirements

- Assess Your Load: Calculate the total wattage of all the devices and appliances you plan to power. Include items like lights, refrigerators, TVs, and any other electrical equipment.
- Consider Peak Load: Some appliances, like refrigerators or pumps, have higher start-up power requirements. Ensure the inverter can handle these peak loads.


Evaluate Solar Panel Compatibility:

- Match with Solar Panels:Your inverter should be compatible with voltage and Current characteristics of your solar panel array. for example your solar array Voc votlage is 120V, then you will need an inverter with Max PV input over 120V ,then can work with your solar array. 
-Consider Future Expansion: :If you plan to add more panels later, choose an inverter that can accommodate this. For example right now you only have 5 solar panel total 1500W. and maybe in the future you will think about to increase them to 3000W. so you would better choose a inverter which Max PV input power 3000W from the very beginning.


Battery Compatibility

- Voltage Compatibility: Ensure the inverter matches the voltage of your battery system (12V, 24V, 48V, etc.).
- Battery Type: Some inverters are better suited for certain types of batteries (like lead-acid or lithium-ion). Check compatibility. Sunflx inverter can work perfectly with lead-acid and lithium-ion. So this will not need to worry.


Efficiency and Performance

- High Conversion Efficiency: Look for inverters with a high efficiency rating (usually above 90%). Sunflx inverter convert efficiency is from 92%-95%. Performance above Standard !
- Maximum Power Point Tracking (MPPT): MPPT technology maximizes the power extraction from solar panels, especially under varying light conditions. Sunflx All inverter are equip with MPPT solar charger with 98% charging efficiency .


Environmental Conditions

- Temperature Tolerance: Check the operating temperature range, especially if you live in a very hot or cold climate.
- Protection Features: Look for inverters with protection against overloads, short circuits, and over-temperature.


Installation and Maintenance

- Size and Weight: Ensure the inverter’s physical dimensions fit your installation space.
- Ease of Installation: User-friendly installation and setup are important, especially if you plan to do it yourself.
- Maintenance Requirements: Consider how easy it is to maintain and service the inverter.


Additional Features

- Remote Monitoring: Some inverters offer the ability to monitor performance remotely, which can be a handy feature.
- Expand ability: If you might expand your system in the future, choose an inverter that can grow with your needs.


Budget and Warranty

- Cost: Balance your budget with the features and reliability you need.
- Warranty and Support: Look for a product with a good warranty and accessible customer support.


Certifications and Standards

Safety and Quality Certifications: Ensure the inverter meets relevant international safety and performance standards.


Brand Reputation

Manufacturer Reliability: Research the brand's reputation for quality and service.

To do the solar system Configuration is a professional work, you can consult your local solar technician. We also have a Automatic Solar System Configuration Tool. Input your system basic info, it can design your off grid solar system in 1 second ! You can contact us to get it . it is Free !

Work with SunSync APP

Manage your Sunflx inverter & battery with ease using our app SunSync. Monitor performance, adjust settings, and ensure optimal efficiency right from your smartphone. Stay connected to your solar power system no matter where you are.

Work with SunSync APP

Manage your Sunflx inverter & battery with ease using our app SunSync. Monitor performance, adjust settings, and ensure optimal efficiency right from your smartphone. Stay connected to your solar power system no matter where you are.

More Details



Contact No/WhatsAPP



NO 1-1, South Yixing Innovation Park, Huangpu, Guangzhou, GuangDong, P.R.China

Manufacture Unit

F2-4, No 1. Zhanye Road, Sunde, Foshan, Guangdong, P.R.China

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