The function of the inverter
The inverter is a power conversion device whose main function is to invert the DC power of the battery into AC power. Through the full-bridge circuit, the SPWM processor is generally used to modulate, filter, boost, etc., to obtain the load frequency, rated voltage, etc. The matched sine wave AC power is supplied to the end user of the system.
Inverters are classified by output waveform:
- Square wave inverter
The AC voltage waveform output by the square wave inverter is a square wave. The inverter circuits used by this type of inverter are not exactly the same, but the common feature is that the circuit is relatively simple, the number of power switch tubes used is small, and the design power Generally between 100 watts to kW. The advantages of square wave inverter are simple circuit, low price and convenient maintenance. The disadvantage is that because the square wave voltage contains a large number of high-order harmonics, additional losses will be generated in the load electrical appliances with iron core inductance or transformer, which will interfere with the radio and some communication equipment. In addition, this type of inverter also has shortcomings such as insufficient voltage regulation range, insufficient protection function, and relatively large noise.
- Staircase wave inverter
The AC voltage waveform output by this type of inverter is a staircase wave, and there are many different circuits for the inverter to realize the staircase wave output, and the number of steps of the output waveform varies greatly. The advantage of the ladder wave inverter is that the output waveform is significantly improved compared with the square wave, and the high-order harmonic content is reduced. When the ladder reaches more than 17, the output waveform can achieve a quasi-sine wave. When using the transformer less output, the whole machine is very efficient. The disadvantage is that there are many power switch tubes used in the step wave superposition line, and some of the line forms also require multiple sets of DC power input, which brings trouble to the grouping and wiring of the solar cell array and the balanced charging of the battery. In addition, the step wave voltage still has some high frequency interference to radios and some communication equipment.
- Sine wave inverter
The AC voltage waveform output by the sine wave inverter is a sine wave. The advantages of the sine wave inverter are that the output waveform is good, the distortion is very low, the interference to the radio and communication equipment is small, and the noise is low. In addition, the sine wave inverter has complete protection functions and high overall efficiency. The disadvantage is that the line is relatively complex, the maintenance technology is required to be high, and the price is relatively expensive.
Solar Panel Installation Without Battery Power As A Backup System
A hybrid solar inverter can work without batteries. This type of system is attached to solar panels and to the power grid which supplies power from both.
The energy produced by the solar panels is directed to the house for use and they do not need to produce all the electricity to run an entire household as shortfalls can be made up from the power grid.
Advantages of installing solar power without battery backup include:
- Savings on electricity bills
- Less costly to install
- More environmentally friendly
- Fewer components to maintain
However, a major disadvantage is that it will not provide power during a black-out or power outage. An installation with battery backup includes batteries that allow electricity to be stored for later use.
Different battery banks vary in size and are charged by both the solar panels and the power grid. The advantage is that the lights stay on even during a power outage.
However, it is more costly to install and there are more components to maintain.
If you live in an area where there is a constant, reliable power grid, a solar power installation system without battery backup will be ideal as it will save you money.
Are you looking to go solar or utilise an off-grid battery system in your home?
At Solarparts, we provide purpose-built mounting equipment for the solar power industry as well as high-quality solar batteries and inverters and are your number one choice in Solarparts solar.
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