Hm, he could just buy 8 garden tractor batteries. Not exactly cheap,
but not that expensive.

But not really suited to the job, becasue they are not deep cycle
batteries.


I use the same concepts for metalworking. I repair things and build
what I cannot buy. I cannot build things for the same price they
are available commercially.

That statement is too broad. The guys who made compressed homemade air
dryers are way ahead, money wise and likely functionality wise.

You are correct.

But I still think making a motorcycle with a large heavy 3phase motor
is the wrong approach.
chuck