now i think that’s all you need to know about the basics so let’s start to dig into the subtopics of the inverter chapter and we’ll start by looking at the different kind of sine waves that you can expect out of the different kind of inverted technologies that are out there in the market so we’ll look at three different kind of sine waves the basic one is the square sine wave and we have the modified sine wave and the last one is the pure sine wave and by the way manufacturers often refer to this kind of sine wave as pure but it is not really a pure sine wave but i’ll explain that later on so let’s have a look at the most basic type of inverter first that’s a square wave inverter so we use the same kind of graph again so on the horizontal axis we have the time on the vertical axis the voltage we have positive and we have negative so your input kind of power is the the dc with the red line so that’s a very stable positive input and you want to convert this into the the perfect sine wave that’s the blue line right so you’re trying to do this the inverter is trying to do this for you but actually your actual output is the orange graph and that’s a very much a square wave very block wave type of output signal so what the inverter basically does it says well let’s put the voltage high let’s put it low high low high etc that’s how it creates an output so you could say that in a certain way it resembles a sine wave but of course you can understand that the total harmonic distortion of this kind of sine wave is is not great now at the same time even though i’m an engineer and i like a fancy technology that can do a lot of different things you know the output of this inverter is not great at the same time it’s not really complex either and in my opinion the fewer components you have the smaller the risk of your equipment to break down so therefore i should give a thumbs up for this kind of technology i should give it credit for its lower complexity compared to the other technologies so the result of the lower quality output of a square wave inverter is that you won’t be able to run all different kind of devices on this type of inverter so i can give you an absolute answer this will work and this won’t work but i could give you a kind of indication so the more complex a piece of piece of hardware is the more complex the electronics are the more likely it is that it won’t work or it will produce a lot of heat or it will start to make some noise some buzzing noises some distortion in if it’s an acoustic instrument will start to distort a little bit so the dumber the piece of equipment the more likely it is that it will work with a square wave type of inverter okay so now that you know what the square wave is let’s look at the next step up in inverted technology which is the modified sine wave inverter so let me explain it in the same way we’ve got a graph we’ve got a horizontal axis with the time on the vertical axis we’ve got the voltage positive and negative so your supply voltage is dc it’s constant and it’s positive and you’re trying to get that perfect blue waveform out of it again now instead of the very rectangular square output from the square wave inverter the modified sine wave accomplishes a kind of a sine wave by making a few more steps and this way it tries to mimic more the the waveform of the the blue graph right so it does this by taking a bit of a pulse in between when it switches between the negative and the positive it takes a pause around the neutral line and then jumps up to positive it waits at the neutral line and goes to the negative etc so you can see it’s very similar to the square wave but just takes a few more steps and therefore it is closer it mimics the perfect sine wave much closer than the square wave inverter all right let them shut up for a second i just want to explain to you that the content of this video is copied from the complete course of off-grid energy systems if this information is enough for you great if you want to learn more and if you want to get access to the complete course then check the information in the description below all right you go out again if we would look at the total harmonic distortion of a modified sine wave inverter it definitely is better than the square wave inverter but you still might have issues with running sensitive equipment with a modified sine wave inverter so it is better then but it’s still not great so i would still give it a thumbs down unfortunately and if we would look at the overall complexity of the system then we still give it a thumbs up because even though it takes a few more steps compared to the square wave inverter it’s still a very simple piece of technology so often when you try to find the less expensive type of inverters out there on the market you probably end up with the modified sine wave inverter now the list of the equipment that you can run with the modified sine wave inverters uh increases uh quite a lot compared to the square wave inverter so of course the dumb equipment you can run on it but also the more advanced pieces of equipment such as your phones or devices that need to be charged your monitor your laptop you know especially the the units that have a power block in between your ac outlet and actual appliance such as your laptop charger most of them will be able to run with the modified sine wave inverter sometimes it might start to produce a little bit of a noise a bit of a humming noise or produces more heat um some pieces of equipment will work but they won’t work as long as with perfect power output so you know the lifetime might be reduced but definitely the majority of equipment will be able to work with the modified sine wave inverter so now let’s have a look at the last type of inverter the pure sine wave inverter so if we use the same kind of graph again we started off with the square wave inverter which is just that rectangular shape then we add the modified sine wave which makes a kind of a pause in between so you have more steps now what the pure sine wave inverter does is that it tries to mimic the pure perfect sine wave the blue line by kind of making multiple steps as it’s trying to mimic that perfect sinus waveform is making multiple steps along the way and you know therefore it’s pretty close to an actual sine wave but it is not so the the name that they give this type of inverter is kind of misleading because it is not a pure sine wave inverter it is more you know technically it’s more a look-alike kind of sine wave that being said for almost everything that you want to do this type of inverter will be perfect it will really meet your needs and it will be just as good or almost as good as the power that you would get from the grid so definitely for if we look at the overall quality of this kind of output from an invert i would definitely give it a thumbs up this is a high quality output if we look at the overall complexity and the cost well these type inverters are definitely a big step up by means of complexity and therefore also cost if you compare to the second type the modified sine wave inverter but you know these kind of inverters they’ll be able to power up almost everything without any noticeable difference the overall efficiency is very high the total harmonic distortion is very low and some kind of appliances that work with sound so that produce or record sound they might still have some issues it also really depends on the specific equipment that you’re using uh what kind of filters etc are built into the hardware itself okay so by now you understand the basics of inverters what happens inside of them and you understand different kind of sinus outputs that can be produced by an inverter now let’s look at the third topic the different kind of inverters that you can find out there on the market

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