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Hi again Stephen,
A simple conversation with Edison and Westinghouse if they were around would provide you with the answer. DC power does not like to travel long distances. It’s slightly more complicated than that simple answer but you get the idea. You are going to need to take the power supply closer to the mount unfortunately. A long A/C extension will have no issues over 12m. The issue with the fan being noisy has 2 potential solutions, neither of which are disconnecting the fan. You may get away with it given you’re not likely drawing the full 12A constantly but in the long term it won’t like it. You could replace the fan with something quieter or change your power supply. I use a laptop style power supply that I bought from Jaycar. It’s a 12v 15A unit and it has no fan.
Hope this also helps
Ryan
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