How to calculate transformer rating
The basic formula is P=VI and between
input output of the transformer we have Power input = Power output
For example if we want a 220W output at
220V then we need 1A at the output. Then at the input we must have at
least 18.3V at 12V because: 12V*18.3 = 220v*1
So you have to wind the step up
transformer 12v to 220v but input winding must be capable to bear 20A.
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