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 12/120V inverter again		  New Topic  Reply to Topic
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khaled125
Apprentece

18 Posts
Posted - Oct 10 2007 :  6:05:38 PM  Show Profile  Send khaled125 a Yahoo! Message  Reply with Quote
sorry..I read the word "charger" on that inverter case what is meant by "charger" here.Sorry but as u may no that am new and this is my first try to make an inverter by my slef so tolrate me if asked u much.
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audioguru
Nobel Prize Winner

Canada
3934 Posts
Posted - Oct 10 2007 :  8:48:40 PM  Show Profile  Reply with Quote
quote:
Originally posted by khaled125

here in our country there is an inverter sold at about 200$ it is made locally the input is 12V and the output is 220V and 700 watt.can u guess the specifications of the transformer of it plz?

The 700W inverter gets warm or hot because it has some losses. The wasted heat is probably about 100W so the 12V car battery, the Mosfets and the 12V winding on the transformer must be rated for 800W/12V= 66.7A.
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khaled125
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18 Posts
Posted - Oct 11 2007 :  4:50:18 PM  Show Profile  Send khaled125 a Yahoo! Message  Reply with Quote
last question plz I am thinking of something but i dont no if it is right just thinking of it which it is that i want 2 make the circuit which converts the 6V dc into 12V dc and then connect it to the inverter since the inverter needs 12V. Will it work?if it will, can u tell me what is the specifications of the 6V battery should be(i dont no if am right or fool in such a thing)coz at the time being i cant get a battery of a car coz the cross-points are blocked and they dont allow any thing to pass these days.This is y am thinking of such a thing.and i would like to thank u much for not ignoring my question .
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audioguru
Nobel Prize Winner

Canada
3934 Posts
Posted - Oct 11 2007 :  5:45:13 PM  Show Profile  Reply with Quote
The 6V to 12V circuit has an output of only 0.8A at 12V. The 700W inverter needs 66.7A at 12V.
Where is the missing 65.9A going to come from??

Why not make a 700W inverter with a 6VDC input and a 220VAC output?
Use a huge 6V battery that can supply 133.3A.
Use a 220V to 12V/134A center-tapped transformer (800W).
Use many logic-level Mosfets (they turn on with a gate voltage of only 5V) to switch the 133.3A from the battery to the transformer.
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khaled125
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18 Posts
Posted - Oct 11 2007 :  7:07:42 PM  Show Profile  Send khaled125 a Yahoo! Message  Reply with Quote
Thanks a lot
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Aaron Cake
Administrator

Canada
6000 Posts
Posted - Oct 14 2007 :  10:32:16 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
Can we please keep this topic actually on topic? With over 100,000 reads it's probably the most popular and informative on this forum and I would hate to have to delete large chunks out of it to clean it up.

That said, maybe it is time to just lock it since all new questions seem to be a complete repeat of previous questions.
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khaled125
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18 Posts
Posted - Oct 14 2007 :  11:39:21 AM  Show Profile  Send khaled125 a Yahoo! Message  Reply with Quote
http://www.sis.gov.eg/En/Default.htm
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audioguru
Nobel Prize Winner

Canada
3934 Posts
Posted - Oct 14 2007 :  1:12:23 PM  Show Profile  Reply with Quote
The Gaza strip is the Middle-East jail.
Are you talking about using an inverter with a 700W load and powering it with a 100Ah car battery?
The battery current will be about 67A and the battery charge will last only about an hour.
The battery might boil dry before its charge runs out.

If the 700W inverter is very efficient then if it has a 100W load a 100Ah battery charge will last for 10 hours.

Where are you going to find the schematic and parts list for a 700W inverter that works?
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khaled125
Apprentece

18 Posts
Posted - Oct 14 2007 :  2:47:15 PM  Show Profile  Send khaled125 a Yahoo! Message  Reply with Quote
No am not talking about 700W inverter.talking about 120W inverter using a car battery 60A.
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audioguru
Nobel Prize Winner

Canada
3934 Posts
Posted - Oct 14 2007 :  6:37:56 PM  Show Profile  Reply with Quote
Where is the schematic of the 120W inverter?

A 120W inverter will draw about 12A from a 12V battery when it has a 120W load.
The charge on a little 60Ah battery will last about 3 or 4 hours.

A little 60Ah battery is used on a little motor-bike. You should use a real powerful battery made for a big American car.
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steamingt
New Member

Nigeria
1 Posts
Posted - Oct 15 2007 :  06:21:51 AM  Show Profile  Reply with Quote
Do you people think the stuffs will work if I try it?
I hate wasting time on what surppose to be ever ready circuit.
thonnybee
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audioguru
Nobel Prize Winner

Canada
3934 Posts
Posted - Oct 15 2007 :  09:58:12 AM  Show Profile  Reply with Quote
What "stuffs" are you talking about?
Some circuits work because they are designed properly and other circuits don't work (guess why not).
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willhse
New Member

1 Posts
Posted - Oct 28 2007 :  6:52:48 PM  Show Profile  Reply with Quote
its better use a 555. use 3 pin to 33 ohm to B, use 3 pin to 1000 ohm to pnp thans. C on pnp to 50 ohm to other trans. forget those 68's. If I can find how to put schematic up....
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pebe
Nobel Prize Winner

United Kingdom
865 Posts
Posted - Oct 28 2007 :  7:16:05 PM  Show Profile  Reply with Quote
Willhse, can you re-phrase that to make sense?
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audioguru
Nobel Prize Winner

Canada
3934 Posts
Posted - Oct 28 2007 :  9:28:04 PM  Show Profile  Reply with Quote
A simple inverter uses two Mosfets or power transistors in push-pull driving a center-tapped transformer.
The Mosfets have a low drive current so they can be driven from a Cmos oscillator IC that has opposite outputs.
The transistors have a high drive current so they need driver transistors to boost their input current then they can be driven from a Cmos IC that has opposite outputs.
The CD4047 Cmos IC is an oscillator with opposite outputs. A 555 is not.
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