48RGB Modules*3 LED/Module*.02A/LED = 2.88A.
How'd you get 11A?
Re-read my message. I said, four of them together. And the LEDs are running at 18mA:
48 * (18mA * 3) = 2.592A Multiply that by 4 pieces and you get 10.368A. Add a little more the AVR and uSD card and I round it up to 11A for the whole piece.
Relays in parallel, not a good idea. Use one to power some LEDs, a 2nd to power other LEDs.
Solve the current difference first tho.
So I could potentially use four 3A ones, one for each section. Tie them all onto the same ON/OFF switch ...