Fifty safe amps, step by step.

Mount the board

Stand the Power-5 on its included M3 standoffs, never flat against a wall or shelf. The feet keep the exposed solder joints clear of the surface and let air move under the copper, which matters at 50A. All four M3 corners are ground.

Pick its stack position while the bench is still empty. Outputs sit on two sides, 8 on one edge and 4 on another, so ports and fuses stay reachable even with another powerboard above. Only the three input terminals vanish under a stack: wire them first, or keep the Power-5 on top.

A brainboard above blocks nothing. Stack it on the five M2.5 QPowerPost standoffs and it draws up to 1.5A of protected power straight through the posts.

Wire the PSU inputs

Connect one power supply to all three barrier inputs. Each input is rated for 20A, so the 50A board rating only exists when all three carry current; fewer cables means a lower ceiling for the whole board. Use 12 AWG or thicker per run, and prefer 10 or 8 AWG at 5V where voltage drop bites hardest.

Terminate in SV5.5-4 fork crimps (the same crimp fits Mean Well LRS barrier terminals on the PSU end) or wire ferrules; bare strands work but should be your last choice. Each input has its own fuse socket, 25A ATO maximum, and the box includes all three.

One power supply per powerboard, never two. Two PSUs on one board end up load-sharing unpredictably, which can become dangerous. The reverse is fine: one big PSU may feed several powerboards.

Choose fuses per run

Fuse to the wire, not to the board. A fuse protects the cable behind it, so match each value to that run's copper and expected draw. Lower values are always fine and encouraged; going above the printed maximum voids the warranty.

The included assortment covers typical installs: 6x 5A for edge injections, 6x 10A for middle injections and 3x 25A for the inputs, all standard ATO blade fuses. 10A is the hard output maximum.

Plan injections by feed point: a front feed carries about 4A, a middle injection about 8A since it feeds both directions. Interleave heavy and light runs, and map the feeds with the ultimate power injection guide.

Land the LED power runs

Every output is a 5.08 mm pluggable terminal with + and − on one connector and its own fuse socket. Wire each run on the bench where the light is good, then click it into the board. Output cable tops out at 14 AWG with a ferrule.

These ports carry power only. Each run's data wire lands on the brainboard's LED terminals, two 4-pin connectors for eight data channels; power and ground stay right here on the powerboard. That split between heavy power and clean data is the whole point of the stack.

Pluggable means serviceable. You can unplug one run for repair without disturbing the other eleven, even mid-season.

Power up and verify

Switch the PSU on. The onboard display shows the board's actual voltage including drop over your input cabling, which is the number your first LED really sees. In a mixed-voltage stack it also identifies each board at a glance.

Then load it properly. Run every channel at full RGB white for a few minutes: a blown-fuse LED lights next to any output that lost its fuse, and the board is designed to settle around 25 °C above ambient at 50A continuous.

Size the supply with headroom and keep it at or below 80% of its rating for continuous duty. The official picks are the Mean Well LRS-350-5 (60A at 5V) and LRS-600-12 (50A at 12V); the full shortlist lives in the power supply recommendations.

Calculate nominal load with the 50% RGB white values from the official power sheets; the 120A of output fuse headroom exists for transient peaks. One exception: ws2815 gets calculated at 100%.