Hi.
I will power a ws2812b led strip from its ends with 2 difference sources. AI told me to cut in the middle of the strip the V connection. Then it gave contradictory info about the ground path. Since common ground is expected of the general systrm I asumed didnt have to cut ground. Ai said if i dont cut ground too data could be affected….
Hi, @Moris526
How long is the strip?
If you power the entire strip with two, supplies you will need to keep the grounds connected.
Just cut the positive supply rail so you have two strips, one for each supply.
This might help;
You need the common ground for the signal reference.
Tom.... 
How many LEDs? Your instincts are correct re the ground AND it tells you the AI is an IDIOT!
Before you cut anything, tell us the number of LED, you may not need to cut anything unless it's hundreds.
Thanks.
90 leds per strip. I thought 45 and 45 ….
Is it unnecesary? Would it be a difference if its 90 from one end only?
Depends on how many Watts/ meter and how long the strip is.
Is a ws2812b 60 led per meter, so 90 leds = 1.5 mts
My Xmas round-the-windows LED strip has 114 LEDs. Powered by USB wall wart from one end only, runs continuously for a couple of months.
What is 1.5 mts?
If it's supposed to be Metres or Meters the abbreviation is M.
Only the USA uses Meter, all the rest of use Metre.
The abbreviation of metre is "m".
To me (NZ) a meter is an instrument, like volt meter. Metre is for length.
This thread is a cross-post.
OP should have asked for an explanation of the already given advice there.
Leo..
Of course, M is Mega.
My bad. I thought since was a new question, a new post
En Argentina is metros, ab. Mts.
I guesed meters would be Mts too.
my bad again
Since you like to use Ai instead of trying to understand the underlying problem...
This is what Google has to say about it:
" For long, high-density strips, it is best to assume a maximum current draw of 60mA per pixel (5V) for planning your power supply, but ensure no more than 4A-5A flows through any single 5V PCB trace segment, using power injection for anything longer than 2 meters."
Your strips are 1.5m and 90 LEDs long, so could draw 5.4Amp.
You could try powering that only at the beginning of the strip and see how hot the strip gets at the beginning of the strip with all white/max and if you are seeing red-shift.
Powering from both ends reduces current to <3Amp and could be safer. Powering at the beginning and 2/3th of the way could be more economic (shorter power wires and better current spread).
Projects like this should be build in stages, with lots of testing in between.
Leo..
True. I power just in the middle if I don't have pre-wiring.
OP should post his power supply specs and description what he is willing to do with this strip.
In this post is the power details
Ahh, I didn't notice it's related to that.
4500 LEDs, max theoretic power 1.3kW.
What are you willing to do with this setup? Likely not to drive it at max..
For sure you don't need two power supplies for 90 LED strip and you don't need to cut any traces, so this topic is already done.
But not open third one.
One 20A PSU can supply more than 300 LEDs at max theoretic power independently if you share them in groups with fuses or not. Within one power supply you don't need to cut traces even if you inject them here and there.
In real life approach you can probably power the whole crap with just five 20A power supplies...
Ps. I have 300 LED strip powered by 2A supply from single end running nice WLED effects in my daughters room for several years...
Well….i was thinking 14 PSU to be covered for full brightness, wich will probably never do. But, to excede the scope of this forum, i need this proyect, keeps me sane.
A few years ago i build a midi controller for max msp in Ableton live, now i want to control the leds with the same midi notes
“No control, I cant believe have no control, its all deranged” sung Bowie
Totally fine, your 14 PSUs can relax while supplying.
But don't overcomplicate your circuit, it's dead simple. AI might lead you to different kind of holes because it has not much reference for 4500 led setup.
One PSU supplies 3-4 90LED strings powered on single ends (preferred in the midpoint). No need for fuses there. If you are concerned about mains wiring, put 6A fuse between mains and PSUs.
Start and 2/3th of the way has a more even power distribution along the strip.
Both ends powers two 45-LED strings.
Start and 2/3th in powers three 30-LED strings
Both ways are practically not much different with 90-LED long strings.
Leo..
Well so it 1.5meters but you still have not told us how many Watts/meter
