Low Frequency Inverter Pure Sine Wave Output – VSUN200M Series


VSUN200M series is a pure sine wave low frequency inverter with toroidal transformer and MPPT solar charge controller. Capacity from 1KW to 6KW, DC 12V/24V/48V and AC single phase 110VAC/120VAC or 220VAC/240VAC are available. It has multi-function LED and LCD displays that are friendly to users. You can set charging current/voltage to design the best solar system to meet different project demands. Support connecting with various types of batteries. With all-rounded productions and adapting high quality international brand new components, it is safe to use and with excellent performance.

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  • 1kw-6kw, Single phase 110V/120V or 220V/240V AC output

  • Continuous stable pure sine wave output with built-in AVR stabilizer

  • 3 times surge power, excellent and strong loading capability without damaging for inductive loads

  • Combining solar system, AC utility, and battery power source to supply continuous power

  • Built-in AC bypass replay, UPS function

  • High convert efficiency (≥92%), Low frequency with toroidal transformer, less than 0.5A self-consumption, energy saving.

  • Built-in Automatic AC charger and automatic AC mains switch. Switch time≤ 4ms, no shutdown for computers/TV

  • LED+LCD display screen with multi-function, easy to monitor dynamic values and program

  • Wide input voltage range, more friendly to users

  • Support to charge for lead acid, gel, AGM, Lithium, LifePo4, deep cycle batteries or customized batteries

  • Multi-stage smart charger 30A charges gel, AGM, lithium battery

  • Set charging voltage/charging current

  • Inbuilt Intelligent high-speed cooling fans

  • All-rounded protections against over-load, over-charging and discharging battery, over-temperature, short-circuit

  • Using new imported big brand in components ensure real great performance

Working Principle

Mains/Utility First Mode: When the mains input is normal, the output power is supplied by the mains bypass. When the mains power is not available, the inverter will automatically switch to battery-powered. (This mode is mostly used as the UPS backup power supply)

Battery Priority/DC First Mode: When the battery voltage is within the specified range, the output power is supplied by the battery bank even when it detects the utility source. When the battery voltage is lower than the battery setpoint, the inverter will automatically switch to the mains supply output. When the battery is fully charged, it will switch back to the inverter battery power supply state. (This mode is mostly used in the field of photovoltaic power generation)

RV Priority Mode: when the input of RV power generation system is normal, the output power is supplied by the bypass of RV power generation system, and when the input of RV power generation system fails, the output power is supplied by inverter

Product Details

VSUN200 Power Inverter

Overload protection function

When the load rate reaches 100%, the machinewill beep alarm continuously. When the load ratereaches 120%, the machine will beep for 1minute to protect and shut down

Overcharge / over discharge protection

The inverter is equipped with battery overcharge /over discharge protection function. When thebattery is charged or discharged to the setvoltage value, the inverter automatically starts theprotection mechanism to protect the battery. (seethe instruction for specific parameter values)

High temperature protection

The inverter is equipped with an active coolingsystem. In the inverter state, the fan coolingsystem automatically adjusts the fan speedaccording to the load rate. When the load rate is20%- 60%, the fan rotates at half speed, 60%-110% at high speed, and more than 120%, thehigh-temperature protection shutdown function isdirectly started

Output short circuit protection

When there is a short circuit in the outputback-end load of the inverter, the inverterimmediately starts the output short circuitprotection shutdown function to ensuresafety. When the short circuit is removed,restart the inverter to restore normalworking status.

Multi grade charging current

The inverter has the function of using themains charging, and is designed with low(5a), medium (10a), high (20a), ultra-high(30a) four current charging. The user canchoose the appropriate charging currentaccording to the actual capacity of thebattery.

Suitable for various battery type

The inverter can adapt to lead-acid battery, gelbattery, lithium iron phosphate battery, ternary18650 battery, user-defined battery type (users setrelevant parameters of the machine according totheir own battery parameters), users set in thesystem according to the actual battery type.

Automatic power on

Our inverter can be connected to themains, realize complementary powersupply and automatic switching with themains. When the inverter uses the mainspriority mode, the mains power supply ispreferred. When the mains power is off, itwill automatically switch to the batterypower supply. When the mains power ison, it will automatically switch back to themains power supply. At the same time, itwill automatically charge the battery. Theinverter also has the mains automaticstart function

About VSUN200(M) Series off grid solar inverter, we have 2 types, with and without MPPT solar charge controller:

WITH MPPT Solar Charge Controller Models(VSUN200M type): VSUN200M-1K, VSUN200M-2K, VSUN200M-3K,VSUN200M-4K, VSUN200M-5K, VSUN200M-6K

WITHOUT MPPT Solar Charge Controller Models(VSUN200 type): VSUN200-1K, VSUN200-2K, VSUN200-3K, VSUN200-4K, VSUN200-5K, VSUN200-6K

VSUN200 specification

Solar Power System, Windpower system

Power Backup System Such As UPS (Uninterrupted Power Supply)

Power Tools

RV(Recreational Vehicle), Vehicles, Boat, Yacht

Emergency Vehicles, Such As Rescue Vehicles, Fire Trucks, Ambulances

Home, Office, Villa, Farm

Low Frequency Inverter Knowledge

In order to convert DC into alternating current, low frequency inverter is used. The current supplied by utility companies is referred to as alternating current (AC). The use of low frequency inverters and high frequency inverters and the benefits you derive from them depending on the circumstance in which they are used and the amount of DC power available.

AC is required for the operation of electronic appliances at home. The primary function of a frequency inverter is to convert the current into an alternating current and convert one frequency to another. Solar energy has enormous potential, which is being recognized by professionals in the field.

It is possible for society to save on electricity bills while also continuing to use solar power on an uninterrupted basis. Solar panels have the ability to create green energy, despite the fact that they require a solar panel inverter. Solar panel inverters convert direct current electricity into alternating current electricity.

There are two main varieties for industrial grade inverters, which can be identified by the transformers’ size and their transistors switching speed, respectively. Pumps, torque-related equipment, and motors all produce electrical surges that require an inverter to be able to absorb.

The quantity of iron content in transformers determines the inverters’ ability to absorb these surges. According to the tolerances and sizes of the transistors that are utilized during inversion, as well as their operating speed, they are classified as low or high frequency, respectively.

For the most part, inverters can be divided into two categories: low-frequency inverters and high-frequency inverters. They each have their own set of distinguishing characteristics and advantages.


What is a Low Frequency Inverter?

Low frequency inverter has a variety of characteristics and functions. Low-frequency inverters use transistors to transform direct current (DC) into alternating current (AC). Their transistors are turned on and off approximately 120 times.

This occurs in a single second of the AC cycle. Their topography is the most straightforward of all inverter designs, although it is restricted to the production of modified square wave and square wave alternating current. The large size and weight of this inverter can help you identify what type of inverter you have.

The inverter is heavy due to the presence of a low-frequency transformer, but the components are highly rugged and reliable. One of the most advantageous aspects of this design is that its transformer provides DC to AC separation while simultaneously preventing potential transistor damage.

In addition, because the low-frequency inverters’ topography is straightforward, their efficiency remains high when there are low power levels. This means that there is absolutely no loss in both the transformer and transistor.

low frequency inverter

What is a High Frequency Inverter?

High-frequency inverters make up a large portion of inverters obtainable from the retail market. Most of the time, these systems are less expensive and have a lesser industrial load tolerance than other types of systems. A high-frequency converter has more components than a low-frequency converter and uses multiple, tinier transformers.

Its application is suitable for a wide range of applications such as small appliances, tool battery charging, computers, and A/V; however, it has a reduced capacity when subjected to high loads of surges for an extended period, such as motors, pumps, and high-torque equipment.

In most cases, the surge capacity or power of a high-frequency inverter is approximately twice as large as the normal output of the inverter, which is a common practice. For high-frequency inverters, this means that when the output rating of the inverter reads 2,000 watts, the output rating will normally be 4,000 watts. Most loads, especially those that are executing electronic loads, should be able to withstand a surge twice the normal amount.

However, when it comes to high-frequency inverters, we frequently run into difficulties when beginning huge motors and loads that start overloads, such as pumps, compressors, and other similar equipment.

So, if you use an inverter rated at, say, 4,500 watts surge and you’re trying to start a 2000 watts compressor, it’s possible that the pump will overheat. Consequently, motors under stress may necessitate the use of such a surge for a while. Something to think about there: in order to properly size an inverter before making a purchase, you must first determine what sort of equipment you will be running.

Low Frequency Inverter vs. High-Frequency Inverter, which is better?

A Low frequency inverter is better than a high-frequency inverter for two reasons: peak power and reliability, both of which are essential factors in power generation. Compared to high-frequency inverters, a low-frequency inverter has been designed to withstand higher power surges for a more extended period.

In actuality, a low-frequency inverter can function at a peak energy level that can be up to three times their normal power for a few seconds. In contrast, a high-frequency inverter can function at a maximum energy level that can be twice their normal energy level for less than a second.

In terms of reliability, a low-frequency inverter relies on powerful transformers that are more sturdy and durable than a high-frequency inverter, which depends on MOSFETs that use power switching and are more likely to fail, particularly when operating at high power levels.

Furthermore, a low-frequency inverter is equipped with a variety of technical capabilities and features that are lacking in the majority of high-frequency inverters.

The advantages of Low Frequency Inverters and High Frequency Inverters

High-frequency inverters


  • Small standby power
  • High efficiency
  • Smaller footprint
  • Less expensive

Low-frequency inverters


  • It runs quite properly with the high surge loads
  • Operates much cooler
  • More reliable
  • It has a more impact resistance

The disadvantages of Low-Frequency Inverter and High-Frequency Inverter

High-frequency inverters


  • The impact resistance and load capacity are weaker than the low-frequency inverter.
  • It doesn’t operate well with high-surge loads like pumps and high-torque tools

Lower-frequency inverters


  • Heavier
  • More expensive

What is a Pure Sine Wave Inverter?

When it comes to inverters, pure sine wave inverters are usually the most costly option available. This is because they generate alternating current power that matches a real sine wave, like the power from a wall outlet. A pure sine wave is a smooth, recurrent oscillation that is steady and continuous throughout its duration.

In terms of functionality, pure sine wave inverters can power any equipment designed to operate on pure sine waves. All devices powered by a pure sine wave inverter operate according to their specifications. Additionally, some devices only work on pure sine wave inverters, and if you attempt to use them with different inverters, you run the risk of causing damage and malfunction.

low frequency pure sine wave inverter

Benefits of using a pure sine wave inverter

Keeping power loss to a bare minimum to keep your electric bill from rising. Keep in mind that an ineffective power backup system will have an impact on your power bill. However, it is the most effective way to convert stored energy into ac for your devices and appliances.

Reducing the likelihood of appliance or device damage as a result of the modified sine-wave frequency.

When a sine wave is produced, the power supply goes up and down with a fluidly switching phase angle, and the polarity of the wave changes instantly when the voltage crosses zero volts. The sudden and unexpected voltage fluctuation and a change in phase angle are all characteristics of a modified sine wave.

The voltage remains at zero Volts for a while and then changes its polarity. Because of the modified sine wave, any appliance or device that relies on circuitry control that detects the phase or abrupt 0 voltage crossing will fail to function properly when supplied with a modified sine wave voltage.

Commercial advantages

With clean power and very low noise, the waveform produced by a pure sine wave solar inverter resembles that of normal electricity, which is extremely important for your equipment to operate properly.

Motors and microwaves, for example, operate at a quieter, faster, and cooler rate when using inductive loads.

Pure sine-wave minimizes electrical and audible noise in a variety of electronic devices such as fluorescent lights, fans, audio amplifiers, televisions, answering machines, and fax machines. It helps to prevent strange printouts, display glitches, and computer crashes.

Pure sine wave output power, which is purer than grid power, ensures that all office appliances are completely safe to operate under these conditions. In comparison to other inverters, a pure sine wave solar inverter provides much higher reliability. In addition, it allows sensitive equipment such as high-capacity fridges and air conditioners to continue operating safely.

When should you choose Low-Frequency Pure Sine Wave Inverter?

Devices that need low-frequency pure sine wave inverters include:

  • Appliances such as compressors, microwaves or refrigerators, or any other machines that have AC motors.
  • Other appliances, such as some battery chargers, light dimmers, and bread makers.
  • Audio and video devices, satellite systems
  • Some medical equipment, like oxygen concentrators and a large number of CPAP devices
  • Low-frequency pure sine wave inverters ensure that everything will function and perform to its maximum capacity and functionality.

If you are looking for a reliable low-frequency solar inverters manufacturer in China, welcome to contact VOKEK, we can offer you OEM/ODM order support if you want to design and make your own pure sine wave solar inverters. VOKEK is one of the leading solar product manufacturers in China with over 15 years of experience, we have well-trained sales and technical team to satisfy your demands. We sincerely invite you to join us to get greater success in the solar business together.