Sixteen terminals, wired right.
Five steps, sixteen fused feeds. The Power-7 ships with its fuses, standoffs and brainboard connector in the box; you bring one power supply, copper and a crimping tool. Decide its stack position before you start, the screw terminals make that choice matter.
Mount the board
Stand the Power-7 on its included M3 standoffs, never flat: unlike the Power-5, this board carries components on its back, and 50A of copper wants airflow. All four M3 corners are ground.
Decide the stack order before wiring anything. The Power-7 trades stack serviceability for terminal density, and that trade shows the moment another powerboard lands on top of it.
The screw terminals stand taller than the fuses. Under another powerboard the fuses are basically impossible to get in or out, so run the Power-7 as the top powerboard, or pre-wire it completely (xConnect pigtails work well) before stacking. A brainboard above blocks nothing.
Wire the PSU inputs
The input stage is identical to the Power-5: three barrier terminals, each rated for 20A, each with its own fuse socket taking a 25A ATO fuse at most. Wire all three from one supply; fewer input cables lowers the whole board's current ceiling.
Use 12 AWG or thicker per input, with 10 or 8 AWG preferred at 5V, terminated in SV5.5-4 fork crimps or wire ferrules. The same SV5.5-4 fork fits Mean Well LRS barrier terminals on the PSU end.
One power supply per powerboard, never two. Two PSUs on one board end up load-sharing unpredictably, which can become dangerous. One big PSU feeding several powerboards is fine.
Choose fuses per run
Fuse to the wire, not to the board. Sixteen sockets at up to 10A each add up to 160A of fuse headroom on a 50A board, and that's deliberate: fuses protect cables, while the 50A figure is the board's continuous thermal rating.
The box covers typical installs: 8x 5A for edge injections, 8x 10A for middle injections and 3x 25A for the inputs, all ATO blade fuses. 10A per output is the cap; lower values are always fine and encouraged, larger ones void the warranty.
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 across the three output sides, and map the feeds with the ultimate power injection guide.
Land the LED power runs
The 16 outputs are 7.62 mm screw terminals arranged as 4 banks of 8: two positive banks and two negative banks spread across three sides of the board. Pair a positive and a negative terminal per run, with cable up to 12 AWG under a ferrule.
Long, heavy home run? Use the double-up: crimp one SV5.5-5 fork across two adjacent positive terminals and a second across the matching negatives. Two fuses now sit in parallel, raising the limit to 20A on 10 AWG cable. Power only on these banks: every run's data wire goes to the brainboard's LED terminals.
Doubling up parallels two fuse sockets, so fit both with the same value and size the pair for that single fat run: 2x 10A reaches the 20A maximum, 2x 5A makes a clean 10A feed on thick copper.
Power up and verify
Switch the PSU on and read the onboard display. It shows the board's actual voltage including drop over the input cabling, the number your first LED really sees, and it identifies each board in a mixed-voltage stack.
Then load it. 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.
Keep the PSU 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 fuse headroom exists for transient peaks. One exception: ws2815 gets calculated at 100%.
Answers are one click away.
The Power-7 FAQ covers the questions that actually come up: how the banks work, the double-up details, fuse access in a stack, HC or not. For everything else there's a Discord full of people who built this before you.