₦airaland Forum

Modified sine wave

A "modified sine wave" inverter doesn't have a square wave form. It has a square wave that has a pause before the inversion of the polarities..
The waveform in commercially available modified sine wave inverters is a square wave with a pause before the polarity reversal. In this case, the waveform only needs to cycle back and forth through a three-position switch with outputs; forward, off, and reverse, at some pre-determined time..
The pix below is how a modified sine wave looks like as viewed on an oscilloscope.

Sine wave


A power inverter device which produces a multiple step sinusoidal AC waveform is referred to as a sine wave inverter. To more clearly distinguish the inverters with outputs of much less distortion than the "modified sine wave" (three step) inverter designs, the manufacturers often use the phrase pure sine wave inverter. Almost all consumer grade inverters that are sold as a "pure sine wave inverter" do not produce a smooth sine wave output at all, just a less choppy output than the square wave (one step) and modified sine wave (three step) inverters. In this sense, the phrases "Pure sine wave" or "sine wave inverter" becomes misleading to the consumer. However, this is not critical for most electronics as they deal with the output quite well.

A sine wave output is desirable where power inverter devices substitute for standard line power, because many electrical products are engineered to work best with a sine wave AC power source. The standard electric utility power attempts to provide a power source that is a good approximation of a sine wave.

Sine wave inverters with more than three steps in the wave output are more complex and have significantly higher cost than a modified sine wave, with only three steps, or square wave, (one step), types of the same power handling.
The pix below is how a sine wave should look like in an oscilloscope.

A power inverter device which produces a multiple step sinusoidal AC waveform is referred to as a sine wave inverter. To more clearly distinguish the inverters with outputs of much less distortion than the "modified sine wave" (three step) inverter designs, the manufacturers often use the phrase pure sine wave inverter. Almost all consumer grade inverters that are sold as a "pure sine wave inverter" do not produce a smooth sine wave output at all, just a less choppy output than the square wave (one step) and modified sine wave (three step) inverters. In this sense, the phrases "Pure sine wave" or "sine wave inverter" becomes misleading to the consumer. However, this is not critical for most electronics as they deal with the output quite well.

A sine wave output is desirable where power inverter devices substitute for standard line power, because many electrical products are engineered to work best with a sine wave AC power source. The standard electric utility power attempts to provide a power source that is a good approximation of a sine wave.

Sine wave inverters with more than three steps in the wave output are more complex and have significantly higher cost than a modified sine wave, with only three steps, or square wave, (one step), types of the same power handling.
The pix below is how a sine wave should look like in an oscilloscope.

An inverter can produce a square wave, modified sine wave, pulsed sine wave, pulse width modulated wave (PWM) or sine wave depending on circuit design. The two dominant commercialized waveform types of inverters as of 2007 are modified sine wave and sine wave.

There are two basic designs for producing house hold plug-in voltage from a lower-voltage DC source, the first of which uses a switching 'boost converter' to produce a higher-voltage DC and then converts to AC. The second method converts DC to AC at battery level and uses a line-frequenc y transformer to create the output voltage.

Square wave

This is one of the simplest wave forms an inverter design can produce and is useful for some applications.
The pix below is how it should look like in an oscilloscope.

A power inverter, or inverter, is an electronic device or circuitry that changes direct current(DC) to alternating current(AC)..
The input voltage, output voltage and frequency, and overall power handling depend on the design of the specific device or circuitry.
The inverter does not produce any power; the power is provided by the DC source.
A power inverter can be entirely electronic or may be a combination of mechanical effects (such as a rotary apparatus) and electronic circuitry. Static inverters do not use moving parts in the conversion process.


A typical power inverter device or circuit requires a relatively stable DC power source capable of supplying enough current for the intended power demands of the system. The input voltage depends on the design and purpose of the inverter.

A power inverter, or inverter, is an electronic device or circuitry that changes direct current(DC) to alternating current(AC)..
The input voltage, output voltage and frequency, and overall power handling depend on the design of the specific device or circuitry.
The inverter does not produce any power; the power is provided by the DC source.
A power inverter can be entirely electronic or may be a combination of mechanical effects (such as a rotary apparatus) and electronic circuitry. Static inverters do not use moving parts in the conversion process.


A typical power inverter device or circuit requires a relatively stable DC power source capable of supplying enough current for the intended power demands of the system. The input voltage depends on the design and purpose of the inverter.

Output waveform

An inverter can produce a square wave, modified sine wave, pulsed sine wave, pulse width modulated wave (PWM) or sine wave depending on circuit design. The two dominant commercialized waveform types of inverters as of 2007 are modified sine wave and sine wave.

There are two basic designs for producing house hold plug-in voltage from a lower-voltage DC source, the first of which uses a switching 'boost converter' to produce a higher-voltage DC and then converts to AC. The second method converts DC to AC at battery level and uses a line-frequenc y transformer to create the output voltage.

Square wave

This is one of the simplest wave forms an inverter design can produce and is useful for some applications.
The pix below is how it should look like in an oscilloscope.

13regular:
which part of abia do you stay cos I don't intend to do this a watsapp stuff rather will prefer spendind my time learning through practical observation tnx

I stay in Umuahia to be precise.

I charge N10,000 to teach how to build transformer based inverters.
I charge N16,000 to teach how to build transformerless inverters. The reason the transformerless design is more costly is due to the fact that it uses a brilliant method to bypass the need of a transformer in such step-up, needful to say that, i will have to teach you to build not just a low voltage H-bridge, but a high voltage (220vdc) H-bridge. Because if you don't know how to build these high voltage H-bridges with a couple of high voltage mosfets, then bang goes your dream of building a transformerless inverter.
Suffice to say the transformerless inverter works with two oscillators; the high frequency oscillator and the low frequency oscillator. It can't work with only one oscillator. But a transformer based inverter can work with only one oscillator.
I shall elaborate more on these topics.

I charge N2,000 per hour of a one on one consultation.
I charge N1,000 per hour through whatsapp consultation.

My guarantee is; at the end of 2weeks and you still aint able to build what i have thought you, then i'll refund your money back.
But if after two weeks, you still aint got the hang of things and could'nt succesfully build a working prototype of what i have thought you,but you don't feel like opting out and requesting for a refund. I can still take you on untill you learn what i said you will.
This would invariable result to a loss of time and effort to me, so i won't let that happen and don't intend to.
I intend to teach you so well using a special laid out concept.. The mistake lots of people make when teaching newbies how to build inverters are; they teach the newbies like the newbies already knew what was what in electronics. Their acquire experience and expertise sillhoute and mask ther brain so that they prefer to teach the newbies using high level explanations which seemingly looks low level to them because of the level they have thus gotten to. They refuse to recall that they were once a newbie who once needed a low level explanations of things.
I have a well laid out curriculum on how to take you through the motions of understanding and building this devices.
But you must have some basic knowledge on electricity, this includes Dc and Ac. You can have some knowledge on one of them, or both. But if you dont have any little or single knowlege one these, then am sorry you do not qualify and aint eligible yet.
In that case, all you need do is, go get some basic knowledge of the aformention topics, then come back to me and i'll take you up.

I charge N10,000 to teach how to build transformer based inverters.
I charge N16,000 to teach how to build transformerless inverters. The reason the transformerless design is more costly is due to the fact that it uses a brilliant method to bypass the need of a transformer in such step-up, needful to say that, i will have to teach you to build not just a low voltage H-bridge, but a high voltage (220vdc) H-bridge. Because if you don't know how to build these high voltage H-bridges with a couple of high voltage mosfets, then bang goes your dream of building a transformerless inverter.
Suffice to say the transformerless inverter works with two oscillators; the high frequency oscillator and the low frequency oscillator. It can't work with only one oscillator. But a transformer based inverter can work with only one oscillator.
I shall elaborate more on these topics.

I charge N2,000 per hour of a one on one consultation.
I charge N1,000 per hour through whatsapp consultation.

My guarantee is; at the end of 2weeks and you still aint able to build what i have thought you, then i'll refund your money back.
But if after two weeks, you still aint got the hang of things and could'nt succesfully build a working prototype of what i have thought you,but you don't feel like opting out and requesting for a refund. I can still take you on untill you learn what i said you will.
This would invariable result to a loss of time and effort to me, so i won't let that happen and don't intend to.
I intend to teach you so well using a special laid out concept.. The mistake lots of people make when teaching newbies how to build inverters are; they teach the newbies like the newbies already knew what was what in electronics. Their acquire experience and expertise sillhoute and mask ther brain so that they prefer to teach the newbies using high level explanations which seemingly looks low level to them because of the level they have thus gotten to. They refuse to recall that they were once a newbie who once needed a low level explanations of things.
I have a well laid out curriculum on how to take you through the motions of understanding and building this devices.
But you must have some basic knowledge on electricity, this includes Dc and Ac. You can have some knowledge on one of them, or both. But if you dont have any little or single knowlege one these, then am sorry you do not qualify and aint eligible yet.
In that case, all you need do is, go get some basic knowledge of the aformention topics, then come back to me and i'll take you up.

13regular:
put the fees down here bro!
I'm in lagos now but hoping to touch down east anymoment from now.

I was going to do that, was just taking it gradually,one step at a time.

I teach you how to build iron core transformer
inverter or the ferrite core transformer inverter usually called; transformerless inverter, and in
2weeks you'll be able to build these
inverters without needing to consult me.
During this period, i shall take you through a
thorough explanations of a resistor,
capacitor, diode, transitor,inductor, ic,
mosfet, H-bridge, relays and transformers,
because these are all what you need to
know to succesfuly build your own inverter,
and troubleshoot it as well if not properly
working.
After this, i shall teach you their schematic
diagrams so you can look at a schematic
diagram and build from it.
I shall back these up with videos and
ebooks.
During this 2weeks period, i shall spend 3
hours daily with you online via whatsapp, as
you build according to what i have thought
you, and if you should encounter any
problem, you can ask me and i will respond
to you immediately.
After these 2 weeks, you'll be able to build
and modify the inverters you build as far as
your creativity can carry.
I teach in such a way you'll understand fast
and get the drift and the hang of things, so
you'll be independent and wouldn't need to
bother me again. So i'll be happy and you'll
be happy too..
In return, you will have to pay me some fee
for the time and effort expended.
I also run a one on one consultation session
on these areas via whatsapp or live. If you
need a live consultation, then you'll have to
come to my location or if i could i would
come over but the chances are remote.
Below are the prices as follows;
I charge N12,000 for teaching how to build an iron core transformer inverter..
And i charge N18,000 for teaching you how to built a ferrite core transformer (transformer less) inverter..
I am currently based in Abia state. You can
contact me on 08099875308
or email me @ ;
kingsleyobinna26@yahoo.Com
for further enquiries.

infinix:
can a sukam 12v, 200Ah battery, that is presently reading 1.4v be revived....
if yes, then how?
I really need help on this

It can be revived. Just build a radiant energy device and you are good.
For more info, call; 08122423549
or email kingsleyobinna26@yahoo.Com

I teach you how to build iron core transformer
inverter or the ferrite core transformer inverter usually called; transformerless inverter, and in
2weeks you'll be able to build these
inverters without needing to consult me.
During this period, i shall take you through a
thorough explanations of a resistor,
capacitor, diode, transitor,inductor, ic,
mosfet, H-bridge, relays and transformers,
because these are all what you need to
know to succesfuly build your own inverter,
and troubleshoot it as well if not properly
working.
After this, i shall teach you their schematic
diagrams so you can look at a schematic
diagram and build from it.
I shall back these up with videos and
ebooks.
During this 2weeks period, i shall spend 3
hours daily with you online via whatsapp, as
you build according to what i have thought
you, and if you should encounter any
problem, you can ask me and i will respond
to you immediately.
After these 2 weeks, you'll be able to build
and modify the inverters you build as far as
your creativity can carry.
I teach in such a way you'll understand fast
and get the drift and the hang of things, so
you'll be independent and wouldn't need to
bother me again. So i'll be happy and you'll
be happy too..
In return, you will have to pay me some fee
for the time and effort expended.
I also run a one on one consultation session
on these areas via whatsapp or live. If you
need a live consultation, then you'll have to
come to my location or if i could i would
come over but the chances are remote.
Below are the prices as follows;
I charge N12,000 for teaching how to build an iron core transformer inverter..
And i charge N18,000 for teaching you how to built a ferrite core transformer (transformer less) inverter..
I am currently based in Abia state. You can
contact me on 08099875308
or email me @ ;
kingsleyobinna26@yahoo.Com
for further enquiries.

Gabrieldagifted:
Thank you very much I do appreciate I must confess, but then apart from the fuselage I need every other materias that made up an rc plane.
Servor,transmitter,electric control speed,receiver,lipo battery e.t.c

Ok, the materials i have for now are; brushless motor, servor,programmable transmitter,receiver, gyro, electronic speed controller,lipo battery, propellers shafts, micro and mini bearings, 3 landing gears (airplane tyres ), rc camera transmitter and receiver with usb, linkage rods and servo horn.
You tell me the ones you need and i shall tell you the prices.

Still selling

Still selling

Still selling

Still selling

Still selling

Still selling

Still selling

gogetter09:
I LIKE YOUR ORIGINALITY,... I LIKE THE WOODEN-CRAFT WORK, WHICH MAKES IT LOOK UNIQUE...
But i would say keep up the good work,... and work more on your design of the metallic enclosure and make use of quality components ,... I know it isn't going to be affordable, but be honest and you will work your way to the podium...

Many thanks brother.

gogetter09:
I specialize more on installations of WIND-TURBINES, SOLAR & INVERTERS,..USA standards, Magnum-energy, Outback, Xantrex, e.t.c

Thats pretty good. Am also looking to go into wind turbines too. Am just concluding my studies on observing the highest wind power that can be produced in a specific area, and the lowest wind power that can also be produced in that specific area. Although not a too precise method, but i am hoping to get the average wind power from these tests. So i'd know how to figure out the parameters for buildind a wind turbine..

I sell sine wave inverters ranging from 500W to 5000W. These inverters all have internal chargers, with inbuilt fan to cool the critical parts of the inverters e.g; mosfets, voltage regulator ics etc. These inverters all come with 8 months guarantee.
Although i build these inverters, i can neither say they are purely locally made, because they aint 100% built by me.
I buy 80% of the prebuilt parts, which are; modified sinewave generators with feedback and inbuilt variable low voltage cuttoff, machine wound transformers etc.
I then build the mosfet banks, battery charger and couple it up. Then they undergo series of tests without load, and under load that pushes them to their maximum ratings..
A maximum of 1 year warranty after sales service is guaranteed.

My prices for the various inverters i build are as follows;
500W 12vdc inverter : N12,500
700W 12vdc inverter : N15,000
1,000W 12vdc inverter: N23,500
1,200W 12vdc inverter: N26,500
1,500W 24vdc inverter: N30,500
2,000W 24vdc inverter: N38,000
2,500W 24vdc inverter: N48,000
3,000W 36vdc inverter: N60,000
3,500W 48vdc inverter: N75,000
4,000W 48vdc inverter: N85,000
4,500W 48vdc inverter: N100,000
5,000W 60vdc inverter: N120,000

My payment method is; pay on delivery.
If you need any info on them, you can call me on; 08122423549
or email me at; kingsleyobinna26@yahoo.Com

Please how many months guarantee does your locally made inverters have?

tushbobo:
Can it cast floor slabs? It seems its mainly for the block-work aspect which is good enough anyway.

its not mainly for the block-work aspect. It can cast floor slabs by programing it to use the concrete hose attached to the header to squirt concrete, while scanning the x axis from left to right, then back to left. It then makes an increment in the y axis, and repeat the scanning process all over again. It does this untill the whole area to be casted is filled with concrete.
The picture below shows the concrete hose that is used to squirt concrete or mortar downwards, it is attached to the header.

Mppt controllers are still available.

Mppt controllers are still available.

Mppt controllers are still available.

Deep cycle batteries are still available.

Deep cycle batteries are still available.

Deep cycle batteries are still available.

Deep cycle batteries are still available.