There are some newer ones but, hoping to go self employed one day and there's a lot of old grain dryers about this neck of the woods, I hope there not all blown!
I'd be going LED in this day and age (not sure if you count that as low voltage, not the traditional low voltage lighting as we know it anyway, actually extra low voltage )
If constant current you'll have to wire in series, constant voltage in parallel as usual.
In terms of actual installtion...
I'm not being funny but your prototype doesn't look like an improvement, basically you have put two retractable iPhone cables in a box and wired to one USB? I can understand how both move, do you mean they both reel out when one is pulled?
3L per our is pretty poor, you can get proper pump that would fit the tank
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I actually use a pond fountain pump
Yes you would have to strip it down to find the star point, it would have been made with 3 sets of windings so there will be a star point, it could be there as soon as you take the top off. Just depends how able you are, you could then reconfigure internally and bring out the 3 leads as it is...
Looking at other forums that seems correct, not sure if using say a 3uf would improve things. You could try and find the star point of the windings and separate to you can connect in delta, things would be a lot smoother.
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