# How much will be the current

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#### dmmahesh

##### Junior Member level 2
If we invert 12Vdc into 220Vac, 50Hz what extend of current (Amps) we can use from the output. Say it is 500W means we may use upto 2Amps., is it right, after getting that output is it possible to stepup up into higher current rate upto 8Amp with same 230Vac? If so what can we do with the transformer or circuit and what would be the forumla we've to use? Please kindly give me in detail

#### swingbyte

##### Member level 2
P=V*I
500W/220=~2A. You cannot get power from no where so this is the maximum current you can draw from this unit. You will need a more powerful unit if you want 240V at 8A
P=240*8=1.92KW!! That would mean
1.92KW/12 = 160A on the input.
Thats a lot of Amps!

#### Johnny Hu

##### Newbie level 4
Hello everybody, this is my first participation here, i hope to learn from you and help with my little skills.

About the calculation above, since the efficiency of any conversor is never 100%, you actually will need more input power than that, say some 12% or more (It depends on the tecnology used to built the DC-AC conversor). PWM/Power-MOSFETs circuits are the most efficient of all.

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