Power supply for led strips

Hi Felix,

Welcome to the forum!!

Before jumping into the calculations I’d check out some
I’d check out the Uberguide for Neopixels. A couple key points:

Taking each supply being able to send 13A each (130 W/ 5 V) and a nominal current of each LED is 20 mA (60 mA at max brightness) - the total draw of all 26m would be about 31.2 A, just short of the total 26A that both power supplies are able to provide. In software, you can tone down the brightness a bit but that also doesn’t leave too much headroom (since no motors are involved it isnt quite as essential but still definitely desired).

Just a heads up regarding the power supplies, make sure a licensed electrician is installing them. Mains power isn’t just lethal, it’s lethal!

When talking about different voltages its better to convert everything to Watts then divide through to get current. A total of 260 W between both power supplies and an efficiency of 75% we’d be looking at about 350 W, RMS of 240V thats about 1.5 A. I’d check out this excellent tutorial on Ohms law: Ohm's Law - Practical Examples for Makers - Tutorial Australia