And we are back to the batteries.
I found the batteries rather confusing. What I wanted was the car to go 100 miles on a charge, and for the batteries to operate this 110v (or they call it a 96v) electric motor. I've got eight rectangular batteries. Each one is comprised of 330 AA shaped batteries made by Panasonic, packaged by Tesla into these units, and intended for the Smart Car. So we could say that Trogdor is propelled by 2,640 AA batteries.
Each one of these eight rectangles puts out 57 volts and 57 amp hours. The voltage needs to be around 110. The amp hours is what gives you distance. I think it's something like 2.4Ah per mile.
To make this easiest to understand, I tried to think in a unit I could understand, instead of being intimidated by these rectangular black things that weigh a ton! I reasoned it out in AA batteries. We load multiple AA batteries into different things and sometimes we load them in series, and sometimes in parallel. Like this picture I drew.
Putting them in parallel you do not get an increase of voltage, but you get an increase of amp hours.
Putting them in series you get an increase in voltage but you do not get an increase in amp hours.
What I needed to do with these Tesla things is double the voltage and quadruple the amp hours, so I needed to wire them to be groups of four in parallel, and then two of those groups in series.
The guys already have terminology for that, it's "4p2s" or four parallel, two series.
The other thing to consider is that, thinking of electricity as water, if I have a short hose going to one bucket and a longer hose going to another bucket, one bucket will empty faster than the other. So I needed to connect the batteries together with the same length of wire each.
I made this wire, joined together in the middle by a huge hunk of steel so it would not buckle the flow, four wires of one side go to the negative terminals of four of the batteries, the four other side go to the positive terminals of the other batteries.
Then the positive terminals of the first set of batteries go to the safety shut off switch, and then on to the contactor box, the negative terminals of the second set of batteries go to the shunt (which would be the return from the contactor box.
Here's the wire I made.