Anyone know amp draw of 12v 29A/350W PS?

[nato595]

I understand the output specs of my 12v DC / 29A / 350W power supply, but does anyone know how many amps that it draws on 120 AC input?

Thanks!

 

[ԆцряєсϮ]

Approx 3 Amps fully loaded.

 

[AAH]

Power supplies of this style will be approximately 90% efficient. The output power is 350W (12V x 29A) so the input power is 350/0.9 which is 390W. At 120V this works out to about 3.25A. 110V would be 3.55A and at 240V it'd be 1.6A.

 

[nato595]

Great! Thank you for the answers and the formula.

 

[nzlongfellow]

Or 12V is 1/10th of 120V so 1/10th of 29A is 2.9A as a rough guide or 12V is 1/20th of 240V so 1/20th of 29 A is 1.45A (Excluding inefficiencies.)