RE: Advantages of a 24 volt system
I put 24 v in Delfin, but also had to have 12 v for the appliances that weren't available as 24 v, so yes, I saved some money on smaller wiring because of the lower amperage needed compared to 12 v, but this was offset by added complexity at the panels.* If you're going to run a lot of wire, sure.* Otherwise, probably not so much and almost certainly not if you're retrofitting since you probably can't completely avoid at least some 12 v circuitry.
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