Reddit mentions of Blue Sea Systems DualBus 100A BusBar - 5 Circuit

u/Firealarm102 If you opt for multiple power supplies, you'll need to make sure you connect the grounds for all of your power supplies *but not the high voltage (VCC) lines*.

Alternatively you could get one (very large) power supply rated for up to ~80A and keep groups of strips in parallel (and isolated) circuits. For example you could design three completely separate circuits of 5 meters each (of LEDs), and join them only at the power supply. That way you could use the same power supply, and since current cannot flow from one group to another, you can get away with thinner wires to each of the 3 circuits than you would if it was all on one circuit. The catch is that you'd need 3 sets of parallel power cables from PSU to LEDs instead of one.

Also keep an eye on wire gauges to avoid things catching fire. Using one PSU with 3 parallel circuits, or 3 separate PSUs, you'd need around 8 or 10 AWG wire to sustain 18A with stranded-core wire. Or if you used just a single circuit and one PSU, you'd need 1 AWG wire (which is insane). See https://www.engineeringtoolbox.com/wire-gauges-d_419.html.

With this high current, you'll want to look at good ways to splitting the power lines. I would strongly caution against just soldering a bunch of wires together to achieve parallel circuits. You could use some of these instead: https://www.amazon.com/gp/product/B000K2K6M0/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

Regardless of your choice of power supply arrangement, you should try to inject power every 1M of LEDs, with this high pixel density. If you opt for 3 groups of 5 meters, that means that each of your 3 power circuits will need 5 parallel circuits inside of that.

If your LEDs live close to your power supply (within a few meters), your data line can still pass through these isolated circuit boundaries just fine, since the circuits will share the same ground (via the power supply). If you need really long cables from PSU to LEDs, you may want to consider 12V instead of 5V LEDs - that will also let you use much thinner wires.

For more information I'd recommend checking out Adafruit's guide to powering 5V LEDs like this: https://learn.adafruit.com/adafruit-neopixel-uberguide/powering-neopixels