... The reason to "not" do this is that 24 volt STUFF is more expensive than 12 volt stuff that does the same thing.
And, 12 volt stuff is readily available EVERYWHERE.
The vote has been cast by the RV and bus converter industry. They build 12 volt house systems, as far as I know.
Using a Vanner for 12 volts is a problem in that the Vanner usually can't handle the full load of the house cause a beefy Vanner like that is expensive and not efficient.
Sean designed his system from the ground up and I think he has a Vanner to make 12 volts for only those systems he can't get in 24 volts. Now, that gives me paws cause he is the kind of knowledgeable guy that could "build" stuff that would run on 24 that used to use 12.