13 May, 2023

What is an Inverter?

The inverter (inverter) is a device whose function is to convert the direct current of DC electricity coming from the panels or batteries into an alternating current of 380/220/110 AC to operate home appliances or pumps or connect the solar energy system to the national electricity grid.

Basic Technical Characteristics of Solar Inverters:

1- Characteristics of AC Output waves:

This will differentiate you from operating some devices that only work on true sine waves.

So, when buying an inverter, we will find that some devices are described as producing a pure or modified sine wave or Modified Sine Wave.

If the output is pure Sine Wave, it will be completely identical to public electricity, and thus operate all devices within the limits of its maximum load, of course.

It is noticed that the modified wave is not compatible with the devices that have a motor.

2- Rated Power:

It is noted that the consumption of devices is often expressed in watts, and some inverters express their capacity in VA.

The user must be careful and aware of the nature of the device and not overload and respond to the warnings issued by the device when increasing the load by reducing loads and turning off some devices or turning off the device completely if it cannot bear it, especially with frequent power outages.

3- Low frequency VS High frequency inverter:

  • A low frequency inverter uses large copper coils to convert current,  for that, it is  heavy and expensive.
  • A high frequency inverter uses electronic transistors to convert current.

Types of inverters (inverters)

1-On Grid Inverter

  • This type is used in systems connected to the electricity grid.
  • This type of inverter disconnects the electric current automatically and turns off completely when the network is out.
  • It is not possible to benefit from solar energy electricity when the power is cut off from the network, as the inverter is completely turned off.
  • The inverter synchronizes the frequency of the outgoing current (50-60 Hertz) with the frequency of the network current using an internal oscillator, and adjusts the voltage with the same network voltage, and this process is called Synchronization.
  • This inverter outputs a pure sine wave current, so that the electricity coming out of the inverter matches the network electricity in all characteristics.
  • Most types of inverters connected to the network now come from the high frequency type. 

2-Off Grid Inverter and Hybrid

  • Most types of inverters separated from the network now come with an internal charging regulator.
  • The current output is either a modified or pure sine wave. And pure wave inverters have become the most widespread in all inverters after their low prices, except for some small inverters intended for operating lighting units only.
  • The voltage of the battery bank supported by the inverter is a specification found in the hybrid inverter or the Off Grid that contains the charging regulator inside it.
  • Automatic switchover in case of power failure – UPS.
  • The possibility of programming priority in operation, whether from panels, batteries or mains electricity.
  • Some inverters have a circuit to operate a diesel generator in the absence of the sun, mains electricity, and low battery charge.

3- Grid Tied inverter with battery backup

  • This system combines the two connected and separate systems, as this inverter accepts batteries with the possibility of connecting it to the electricity grid.
  • The main difference between this inverter and the hybrid inverter is that this inverter can pump electricity to the network in addition to using electricity from the network.
  • This inverter performs the Synchronization process.
  • This inverter separates the pumping of electricity to the network when the power goes out, but it does not turn off.

4- Solar pump inverter

  • These inverters have the ability to control the speed of AC pumps from the moment they are turned on at sunrise to the moment they are turned off at sunset, through their normal operating period during the day.
  • Solar pump inverters receive a series of cells connected in series with a total voltage of up to 800 volts.
  • The inverter controls the starting of the motor by gradually raising the voltage and frequency from zero until it reaches the programmed initial speed.

Atlas for Support and Services has distinguished practical experiences in inspection, preparation and testing services for solar systems, starting from the inverter manufacturing stage and ending with installation and maintenance through a team of highly experienced engineers and technicians using the latest testing equipment and various tests. such as ISO/IEC.

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