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[SOLVED] suggestion for transformer wattage

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Genovator

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I want to use a STEP UP transformer which will convert 12 V to 220 V. I want a current output of 5 Amp or more. Then what will be the current drawn in primary coil (12 v input)????
And also what will be the rating of the transformer???
 

remember conservation of energy?

Well, for an ideal transformer, the power into the primary = power out of the secondary. Since you want 220*5=1100 watts out, you need 1110 watts in, or 1100/12=92 Amps. But since you can't buy an ideal transformer, you're going to need to put more than 92 amps in. You need to know the efficiency of the transformer to figure this out.
 

There's always the question behind the question.

e.g. If he wants to make an inverter, then the picture might be:
12V DC => chopper => 12V pk-pk AC => 220V rms AC,
which would change the transformer ratio etc.

I think Crutschow was just poking at the requirements.
 

crutschow said:
What is your source for 12V?
Is that 12Vac or 12Vdc?
Click to expand...

Source is 12 V DC lead acid battery. I will invert it.
I was confused whether the primary coil can withstand such a huge current of 92 Amp or more. I thought it might burn the coil.
 

You just have to buy (or make) a transformer that can handle the current.
 

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