Electronic – Power cable for 5V 20A power supply

powerpower supplyswitch-mode-power-supply

I bought a switching power dupply (SMPS) rated at 5V | 20A | 100W.
Power Supply

But it seems I don't understand how power supply works. I need total of 18A on output, but that seems to be over the limit of standard 16A | 220V wall outlet's limit.

How would I power this supply without burning my house down? I bought fuses and relays but that can only handle max at 10A.


Reason for such high amperage needed:

I was going to power 300 LEDs that require 5v 60mA per LED.
I'm planning to make it in 2 parallel structure, giving me 150 leds each side. It turns out I need 5v each side with 9A flowing each side, totaling 18A.
So does two 9A merge on outlet's side?

Best Answer

If you only draw 90 watts from the supply, it will only draw perhaps 100 watts from the AC source - a power supply passes power (voltage times current), not just voltage or just amperage. (The "extra" input power is lost, usually as heat, due to inefficiency in the conversion process).