3D printed mine with aluminum end caps. Not quite done...need to wire up the BMS. There is a cover that goes over the BMS case. Those are insulator pieces between the cells. There are people that put their cells against each other with no insulators...that's a bad move in a mobile environment.
A wire's ability to carry DC current depends on the cross section of the wire. You could have 1 strand or 3000 strands, if the cross section is the same, the resistance is the same and the voltage drop is the same for a given current..
Actually, it's because Texas decided to be on their own and then decided it wasn't worth the money to design the power plants and wind farms to work in sub zero weather. They have windmills all over the world where it gets colder than Texas got. Texas just has a mis managed power system...
If you have to have two cables. Each should have its own crimp connector and just stack them. Just because some Chinese battery manufacturer does it doesn't mean it's the correct way to do it.
If the 400A is less than the max current spec of the 24V battery bank, I don't see why not. Make sure the alternator really has a 400A continuous duty rating. If the batteries have a BMS, it will shut down the charge going into the battery.
The reason people use a DC to DC converter is because...
I used this guy's design and yes, you print top and bottom.
https://diysolarforum.com/threads/280ah-battery-top-and-bottom-support-design.5261/
This is the Thingiverse link
https://www.thingiverse.com/thing:4589040
Now that I am slightly proficient in Fusion 360, I can now make my own. The...
That's pretty funny. Before this last election, the mail in votes were predominantly Republican. Never heard a peep until they thought it was hurting them. All of a sudden Republicans don't like it when everyone has an easier time voting. BTW, pretty much the only fraudulent mail in votes were...