The 1st thing I noticed is his car headlights use less power than one of my tail lights. Made me look a little closer.
I must question if HE ever tried it.
Nobody dumps at 12.0V, so change 12V to 14.2V. Now the 3' rod dumps 5,752W (more than enough watts for Dan's 20').
Over 1.9KW per foot.
Over 400A. Meaning 4/0 wire to the rod is undersized. I wonder what relay, mosfet, or IGBT it takes for that, but I know it's not cheap!
Dan's 20'. 5KW, 56.8V, 88A? So about 0.645 ohms. That's 53' 9" of rod.
Something more real. 10' windmill, 12V, 1000W, 70A. That'll take 17'.
Or a more common 400W 12V machine, 28A. That will take 42'! It would be about the same as 20, 10 ohm, 25W resistors. If you bought Ward Leonard / Ohmite 5% low inductance 10 ohm 25W ceramic tube resistors from me, it would be $30 and Easy.
No idea what SS all-thread costs, but it certainly can't save much money.
It might work out better with 3/16" or 1/8".
If I was going to make them, it would be Ed's way, or nichrome in a heater like Capt Slog did.
G-