Your new layout is better than the previous one at evening out the voltage drops that each of the LED strips sees. You overlooked one step in calculating the voltage drops for some of the strips, but the resulting error is small because of the short lengths of the wires as well as the LED strips. With longer strips that would require more power or longer wire lengths, that error could be more significant.

When you calculate the voltage drop for a LED strip, you need to factor in the voltage drop that results from current that is used by any other LED strips that share any part of the wire all the way back to the power source.

The 30" and 36" strips are the simplest example here, with a common 3' wire feeding both. Each strip sees a voltage drop caused not only by its own current draw, but also caused by the current drawn by the other strip

Wire length: 3' x 2 = 6'

Ohms: 0.061

Current for 30" strip: 0,37A

Current for 36" strip: 0.44A

Total current: 0.81A (0.37A + 0.44A)

Total voltage drop: 0.0494V

Voltage that both strips receive: 23.95V

The 44" strip is a little more complicated, because the 6' wire segment closest to the driver carries current for both the 44" strip and the 14" strip, while the 10' segment closest to the 44" strip carries only the 44" strip's current.

Wire length that is unshared: 10' x 2 = 20'

Ohms: 0.203

Current for 44" strip: 0.53A

Voltage drop for this segment: 0.1076V

Wire length that is shared: 6' x 2 = 12'

Ohms: 0.1218

Current for 44" strip: 0.53A

Current for 14" strip: 0.17A

Total current for this segment: 0.7A

Voltage drop for this segment: 0.0853V

Total voltage drop across both segments: 0.0853 + 0.1076 = 0.193V

Voltage that the 44" strip receives: 23.81V

The calculation for the 14" strip is similar. It sees some voltage drop caused by the 44" strip sharing that common 6' segment of wire.

Overall, the differences in voltage drops here are very small. A difference of a few hundredths of a volt or even a few tenths of a volt in the total voltage drop isn't going to make much practical difference.

With these lengths of LED strips, you should be ok with a 24 Volt, 60W LED driver.

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