I see this as an absolute win. Be careful, folks. Just because it’s DC doesn’t mean it won’t cause serious damage.
Edit for Clarification: When done correctly, the batteries should not arc. My problem is I did not wire the array correctly the first and a-hem second times. It only cost me one battery, which is a lot cheaper than a trip to an American ER.
Either polarity will arc the same, the reason on cars for doing negative first is because you’re supposed to attach it to the frame, so a spark doesn’t set off any hydrogen in the battery and cause an explosion.
The frame is already grounded negatively. so if you remove red and happen to touch red post while leaning on metal car you make a circuit. so you pull negative first so even if you touch red it can’t travel back to the battery