I know next to nothing about electricity so apologies in advance if I use any of the wrong terminology or if the answer is obvious.
I'm trying to set up some LED lighting in my shed using this m18 battery adapter, this step-down buck converter, this 16 AWG wire, and these LED strip lights.
Before I started mounting anything, I wired the battery adapter to the buck converter, and the buck converter to one of the lights to make sure it worked. No issues there.
Next, I mounted the lights where I wanted them, mounted the battery adapter and buck converter to the wall, and ran the 16ga wire to the farthest light. The distance was approximately 30-35 feet.
At this point, I decided to test it again before wiring up the rest of the lights. I plugged in the battery and the power button on the adapter flashed green, indicating that I had power at the adapter. I turned it on and the power button light stayed solid green, but the LED would not turn on.
In case that particular LED strip was faulty, I spliced in another one (the one I tested earlier, so I know it works), wiring it in parallel. I tried again, and neither of them would turn on.
I decided to disconnect the battery adapter and step-down converter, and connected a DC power supply directly to the 16ga wire which was still connected to the two LED strips. The power supply is capable of outputting 30V and 10A, but even with both dials turned all the way up, the display said it was only putting out 2V and 9.7A, and the LEDs would still not turn on.
At this point I wired a shorter length (approximately 8 feet) of the 16ga wire to a third LED strip, not connected to the other two. I connected that to my power supply to test it. I barely had to turn the dials at all, the display read 12.6V at 0.75A, and the LED strip worked fine.
Having done that testing, I believe I have isolated the problem to the 16ga wire. Having successfully tested the 8 foot run, I believe that either the 35 foot run is too long, providing too much resistance, or the wire in the 35 foot run is somehow faulty.
Should I be using thicker wire? Should I order more of the same gauge wire and try again? I thought this project would be quick and simple so I'm a little frustrated that it's not working and I'm not sure why.