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2 x 12 volts ain'r enough. Mount, fans, peltier or other accessories. I'd always over plan then add couple more. Redundancy and alternatives. You may find your USB hub has some issue handling multiple devices so you need to add another hub and therefore more input\output options.
I have a 6 place 240 vac connector on my pier, only using 3 at present but equipment needs change and grow.
I also run 5v to my pier for slow fan mode on the Newt. I'll build a 7.5 for the DSLR shortly.
Pier connections is the bane of the astronomer I tell ya ..
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