Not sure I understand exactly where the batteries are located e.g. "Framework".
But here's where I was going with my comment. 12V systems have creep. That is,
things get added to it over time, Cigarette type outlet, Higher power for a Radio
or two; CB, HAM, AM/FM, then Navigation, Air compressor, Frig and so on. If you
can think ahead of what all the 12V appliance will be then you need to think
about which will be "Hot" (on all the time), which will be "Switched" e.g. when
the Ignition is switched on, do you need any 24V beyond the DCDC converter for
say a PinzSSI and so on. Once you have that list of items then each should be
Fused with a ATO/ATC fuse via a fuse block. The Battery should be protected with
a circuit breaker, the feed to the DCDC converter should also be fused -- never tap
into a source of power without protection.
Once you have all these options listed out, they will need to be organized on a panel,
that takes up a lot of room and a convenient place to put it all. Then the feed-point
from the 24V kinda falls out of that design for you. If your going to put this stuff on
the outside wall of the 712 you have no choice but to drill a hole(s). But again you
may find more than just the 24V line wants to go through that hole so plan ahead.
A panel I put together for my 712 is below. It's behind the drivers seat as this is a M.
I drilled a 1" hole in the floor air-duct cover to run cables from the distribution panel
to the engine bay which includes the 24V Battery Box, the remote +12V Battery and
several cables for Engine monitors. I used a water tight cable Gland to seal that all up.
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