Here I intend to generate up to 100 Watts from 12v so that I can run equipment that is not sensitive to frequency, level or waveform. This means lighting, including flourescent and economy lamps. It also includes transformer-operated equipment. It does NOT include any device using AC motors or Switch-Mode Power Supply units (SMPSU)

This inverters main advantage is the few components required.
The circuit operation itself is nothing more than a simple multivibrator.

The transformer in this circuit can be any mains transformer that will take the power, but with two identical secondaries, or a "split secondary" winding. For example, a 230v - 12-0-12v transformer can be used in this circuit to convert 12v DC to 230v AC.

The two resistors in the circuit must be rated at a sufficient power level that they will not burn. For a 12v inverter you can use a pair of 14v 0.1A indicator lamps, since these are cheaper than 1.5 Watt resistors (here in Nigeria). If you want a 48v DC input 500 Watt inverter, then use 100W 230v lamps.

The output of this inverter will normally tolerate a short-circuit, but the output frequency will vary considerably, possibly from 35Hz with no load, to 150Hz with full load. But for loads with transformer input, and for lamps, this is quite acceptable.

http://i76.servimg.com/u/f76/18/48/99/32/simple10.jpg

NB: depending on the seriousness on this site then i will get my current working inverter. It is a fully automatic inverter. That you would not like to miss.

WELCOME TO THE HOME OF SHARING IDEAS, SHARING TALENTS AND NOT SHARING ABUSES AND INSULTS

Please this post is not for people who wants to learn how to solder, and for people that cannot identify the simplest components.
So as the founder of the post I would like to start up with a simple 250 to 5000 watts PWM DC – AC 220v power inverter. I hope this forum allows the display of .jpg and .pdf file -The schematic circuit design is for a 250 watt output, while the pics are of my 1500 watts inverter that i built, to increase the power of the circuit you have to add more of the Q7 and Q8 transistors in parallel, each pair you add will increase your power by 250 watts, ex: to get 750 watts of power from the inverter you need to add 2 of Q7 and 2 of Q8 to the original design.

--If you increase the power transistors you have to enlarge the T2 transformer to match the new needs, the circuit's transformer is rated 25 amps to handle 250 watts of 220v, for every 1 additional amp you need on the 220v side you have to increase 10 amps on the 12v side, of course there are limits to the thickness of the winding so if you need more than 750 watts i recommend that you use a 24VDC supply instead of 12 volts:

DC voltage and Transformer "T2" winding recommendation:
Power Supply Winding
750w 12VDC P:24V "12-0-12" / S:220V
1500w 24VDC P:48V "24-0-24" / S:220V
2250w 36VDC P:72V "36-0-36" / S:220V
3000w 48VDC P:96V "48-0-48" / S:220V
3750w 60VDC P:120V "60-0-60" / S:220V
4500w 72VDC P:144V "72-0-72" / S:220V
5250w 84VDC P:168V "84-0-84" / S:220V
*The transformer should be "center tapped" at the primary side.
**You can make the secondary 110v if needed.
***The transformer in the pic is a custom made (48V center tapped / 220v ) 2000 watts

--R1 is to set the PWM to 220v
--R2 is to set the frequency to 50 or 60 Hz

--Use either tantalum or polyester film "as in pic" for the 104 caps, ceramic disc caps change value once hot and this in turn changes the frequency of the inverter so they are not recommended.
--Wiring should be thick enough to handle the huge amps drain from the batteries.
--The design does not include a battery charger since each person will be building a custom version of the inverter with specific power needs.
--A cooling fan will be needed to reduce heat off the heat sinks and transformer, i recommend getting a 220v fan and connecting it to the output T2 transformer, when you power up the circuit the fan will start this will always give you a simple way to know that 220v is present and everything is OK..

--2 circuit breakers are recommended instead of fuses, one on the DC side and one on the AC side, depending on your design
Ex: for a 24vDC ( 1500 watts design ) put a 60Amp breaker on the DC side and a 6Amp on the AC side.
For every 1amp of 220vAC you will be draining like 8 to 10 Amps from the 12v battery, make your calculations !

-- The 2 Heat sinks should be big enough to cool the transistors, they are separate and should NOT touch each other.

--Be cautious when building this circuit it involves high voltage which is lethal, any part you touch when the circuit is ON could give you a nasty painful jolt, specially the heat-sinks, never touch them when the circuit is on to see if the transistors are hot !!

http://i76.servimg.com/u/f76/18/48/99/32/250_to12.jpg

Hey Mr.Maclee you seem rather knowledgeable about this. Please do you know as much with regards to solar panels and charge controllers?

I would like to connect solar panels to my existing inverter-battery system.

The case now is that the inverter charges the batteries, it has an inbuilt charger. If I then go ahead and add a solar panel to the mix, won't that overcharge the batteries?

well its depends on the rating of the solar panel and the charger, you may decide to add an extra battery and it will charge perfectly.. But adding the solar panel can result you adding a simple circuit that consist of zener diode to cutoff the voltage when it is fully charged and when it sense another voltage from other source

Why BJT instead of MOSFET. Heat loss is too much from bjt transistors.
Good point on the tantalum though.

Akanniade: Why BJT instead of MOSFET. Heat loss is too much from bjt transistors.
Good point on the tantalum though.

Thanks for the contribution... MOSFET can also be used this was the first design but was later modified with MOSFETs IRFP250. A 1k resistor will be connected to the Gain of the MOSFET from the output of the SG3524, a 10k will be connected from the Gain to the Source to Ground and the drain will then go to the transformer. Same will be done to the other output

maclee: well its depends on the rating of the solar panel and the charger, you may decide to add an extra battery and it will charge perfectly.. But adding the solar panel can result you adding a simple circuit that consist of zener diode to cutoff the voltage when it is fully charged and when it sense another voltage from other source

Thanks for the response, I'm looking in depth now into charge controller specifications to see if any would fit this situation.

Yoshi-Master:


Thanks for the response, I'm looking in depth now into charge controller specifications to see if any would fit this situation.

sorry i didn't get that

hahahahahahahahaha, u dnt really what u are doing, why re u wasting pples time here,

profcharles: hahahahahahahahaha, u dnt really what u are doing, why re u wasting pples time here,

lol is there any question you asked and i didn't answer?

You are talking about inverter.. what about inverter using micro-controller that will perform better with stable frequency

embeddoyin: You are talking about inverter.. what about inverter using micro-controller that will perform better with stable frequency

Bros bfor you reach the stage you are today you start from 1... ppl never learn this one finish u dey talk of microcontroller.. u think say to write the source code na come chop?
abeg take am easy. i fit still give u that one if u want it..

Hello peeps...

Can I increase the chargeability of my inverter by adding more solar panels without adding extra batteries?

This my present ratings am not satisfy with the charging level with the solar panel below but if i charge it with NEPA it's better, so am thinking of adding more solar panels so that it would increase the level of charging whenever I charge with solar.

I need you guys to advice me and explain better to me

Below is my present ratings:

Solar panel--
20W

Inverter--
Output:230Vac, 100W
Unit battery:12v, 13Ah sealed lead battery

mohammedmuz: Hello peeps...

Can I increase the chargeability of my inverter by adding more solar panels without adding extra batteries?

This my present ratings am not satisfy with the charging level with the solar panel below but if i charge it with NEPA it's better, so am thinking of adding more solar panels so that it would increase the level of charging whenever I charge with solar.

I need you guys to advice me and explain better to me

Below is my present ratings:

Solar panel--
20W

Inverter--
Output:230Vac, 100W
Unit battery:12v, 13Ah sealed lead battery

What amps does the solar gives? confirm that and reply but if u cant, u can add another solar parallel to it. i think that should increase the power

I want somebody to pls give me the address
of where I can buy quality inverter components
and transformer in Lagos. thanks
my email: muhammedadio@gmail.com
p. no: 08082698875

oga maclee please is there any site i can learn how to build tranformers

ajabani4allah:
I want somebody to pls give me the address
of where I can buy quality inverter components
and transformer in Lagos. thanks
my email: muhammedadio@gmail.com
p. no: 08082698875

try oshodi main market or alaba international

Mcleen u're doing a gr8 job,looking forward to learning some stuffs from you.

YoshiMaster:
Hey Mr.Maclee you seem rather knowledgeable about this. Please do you know as much with regards to solar panels and charge controllers?

I would like to connect solar panels to my existing inverter-battery system.

The case now is that the inverter charges the batteries, it has an inbuilt charger. If I then go ahead and add a solar panel to the mix, won't that overcharge the batteries?

I admit I don't know much as mr maclee but to the best of my knowledge adding up an extra voltage to the existing charger voltage (irrespective of the amount of ba3 cells)might damage ur inverter as it will exceed the charging ratings of the device.

This will suffice for me

maclee:



What amps does the solar gives? confirm that and reply but if u cant, u can add another solar parallel to it. i think that should increase the power

bros a beg help a brother , I want to learn about inverters inside out but I don't know where to start please any suggestions

PS I can solder and I have basic knowledge of electrixal components

pls I get the circuit diagram of an inverter with irfp250 and sg3524..can it work if I construct it?

owemas:
pls I get the circuit diagram of an inverter with irfp250 and sg3524..can it work if I construct it?

yes it will...I already built one inverter using cd4047 ice n irfz44n transistor.

i hate copying pasting...i love creativity

augnellywinex25:
i hate copying pasting...i love creativity

so what have you created, without recourse to existing technology?

Mr. maclee, Do you mean the two lamp indicator can work in the place of two resistor?
thanks

How to stop noise for sg3524 inverter

Pls what is the formular used in calculating power rating of an inverter when building.

alexander007:
How to stop noise for sg3524 inverter

Where is the noise you want to stop emanating from? The transformer? or the feedback system?
You have to state where the noise is coming from, so you can get help from experienced builders..

temizeee:
yes it will...I already built one inverter using cd4047 ice n irfz44n transistor.

Do you build for sale?

Pakingzzz:


Where is the noise you want to stop emanating from? The transformer? or the feedback system?
You have to state where the noise is coming from, so you can get help from experienced builders..

Do you build inverter for sale?