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DC voltage distribution over long distances is a pain. You have a few choices: 1) Pull big cables. Really big cables. Not really worth it. 2) Calculate the voltage drop for a reasonably-sized cable (say, 10 gauge), and sent 12V + the voltage drop at the start. This is a common approach for landscape lighting, though that commonly runs on AC, not on DC. You ...


You will want to limit the voltage drop in your DC distribution wiring to 5% or less of the 12V. That would be equivalent to a 0.6V drop. An online wire size calculator suggests that for 600 feet at 3A that you would need to use 1 AWG copper wire. Cost of that size wire suggests that you may want to consider distributing the AC mains voltage instead and ...

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