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 12/120V inverter again
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - May 19 2007 :  1:32:35 PM  Show Profile  Reply with Quote
quote:
Originally posted by sunil_223
i want to know that what is the watts for R1,R2 and R3

Very, very low. Calculate it:
The max voltage across R1 is about 6.5V. Then its max power is only 0.9mW. The power in R2 and R3 is much lower. So any resistor power rating will be fine.

quote:
and what is the volts for .1uF cap

It gets only 6.5V across it. I would use a metalized poly 5% capacitor. Their minimum voltage rating is 50V or 63V which is fine.

quote:
and what is the volts for power switch?

It gets a max voltage of about 14V so any voltage rating will be fine.

quote:
relay is necessary for this circuit?

There is no relay in the circuit. A high current switch is shown.

quote:
can u tell me what is 12-0-12v transformer?

It is 24V with a center-tap and it is needed if a 12V car battery powers the inverter. A transformer with two 12V windings can also be used if the windings are connected together properly.

quote:
i had purchased it.

I hope it has a power rating that is high enough.
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sunil_223
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7 Posts

Posted - May 20 2007 :  02:40:59 AM  Show Profile  Reply with Quote
thanx audioguru
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sunil_223
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7 Posts

Posted - May 20 2007 :  03:30:55 AM  Show Profile  Reply with Quote
audioguru can u tell me that what is the effect if we use 12v but with different amps.I mean to say that if i am using 12v battery with 2.3amps/h and if i replace it with 1.2amps/h.
does it effect watts or volts or nothing will happen?

and what if i change the volt from 12v to 24v?what will be the effect?

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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - May 20 2007 :  9:56:34 PM  Show Profile  Reply with Quote
A 100W inverter need a battery current of 10A. A 500w inverter needs a battery current of 50A.
A car battery, not a tiny little battery like you have. A car battery is rated at 70Ah to 100Ah.
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sunil_223
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7 Posts

Posted - May 25 2007 :  07:42:57 AM  Show Profile  Reply with Quote
hi audioguru can u tell me approximately how many solar cells i will be required to get 12v 5amps.
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - May 25 2007 :  11:30:00 AM  Show Profile  Reply with Quote
quote:
Originally posted by sunil_223

hi audioguru can u tell me approximately how many solar cells i will be required to get 12v 5amps.



I don't know the size and the ratings for your solar cells.
I bought a 12V/150mA solar panel. I don't live on the equator so its output current at noon when it points directly at the sun outside is only 120mA. Before or after noon its output current is much less. If it is not aimed directly at the sun then its output current is also much less. Indoors with it aimed directly at the sun at noon its current is only 50mA.

Your 12V/5A solar panel will have an average current of about 2A for 8 hours per day. Not enough power for an inverter at night.

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Aaron Cake
Administrator

Canada
6702 Posts

Posted - May 27 2007 :  10:21:30 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
quote:
Originally posted by sunil_223

hi audioguru can u tell me approximately how many solar cells i will be required to get 12v 5amps.



Please keep all other topics out of this thread. This thread is for inverter discussion only. Thanks.
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intelboard
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19 Posts

Posted - May 30 2007 :  12:02:04 PM  Show Profile  Visit intelboard's Homepage  Reply with Quote
Is their any method to step-up AC voltage without a transformer ? (Please Reply soon)
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - May 30 2007 :  7:49:27 PM  Show Profile  Reply with Quote
A 555 oscillator can drive a voltage doubler. tripler or quadrupler to increase the voltage but the current is reduced.
An ICL7660 IC doubles the voltage or makes a negative voltage but its output current is pretty low.
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intelboard
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19 Posts

Posted - May 31 2007 :  09:19:53 AM  Show Profile  Visit intelboard's Homepage  Reply with Quote
Can any transistor do that thing without decreasing the current
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - May 31 2007 :  10:34:38 AM  Show Profile  Reply with Quote
Make a transistor oscillator then add a voltage multiplier circuit to it.
Power out must equal power in so if the voltage is doubled then the current output is halved.
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intelboard
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19 Posts

Posted - May 31 2007 :  11:21:48 AM  Show Profile  Visit intelboard's Homepage  Reply with Quote
Can you show me the schematic of both the circuit - with 555 osc and transistor.
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Aaron Cake
Administrator

Canada
6702 Posts

Posted - Jun 01 2007 :  09:18:49 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
quote:
Originally posted by intelboard

Can you show me the schematic of both the circuit - with 555 osc and transistor.



Please create another topic and discuss the circuit there. This topic is for discussion of the 12V to 120V inverter and related circuits only.
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intelboard
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19 Posts

Posted - Jun 01 2007 :  11:01:13 AM  Show Profile  Visit intelboard's Homepage  Reply with Quote
This circuit is also related to 12v to 230v inverter only.
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tim
Mad Scientist

198 Posts

Posted - Jul 04 2007 :  3:40:56 PM  Show Profile  Reply with Quote
is there some kind of formula as to putting mosfet transistors together to run either an inverter or a dc motor controller, i mean the control for the gates on the mosfets.
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