Math alert:

My spiral trees have 42 pixels. That means 42 x3 =126 LEDs per tree.

2 trees are connect each controller. That means controllers have 252 leds.

So if we allow 20mA per LED. That comes to a total of

252 x 0.02 = 5.04A.

* controller fuses have to be 5 Amps.

The spiral trees operate at 5v. To save on voltage drop I will run 12v to a small 10A dc dc converter that is located close to the controllers. 2 controllers will be connected to a single dc dc converter. That means it will supply 10.08Amps

10.08×5/12= 4.2Amps at 12v. (Assuming perfect conversion)

Realistically there will be about 20 to 25% loss.

4.2 / 0.8= 5.25 Amps or 4.2/0.75=5.6 Amps.

* dc dc converter

fuses have to be 5 Amps.