Not to doubt your info, but I see no way any fan pulls 80 amps, or even 40. Please recheck this data.

2nd, you can't rig 2 40's to get 80. Doesn't work that way. You can't split up 12 volts to run thru each and divide it up that way.

Starter motors don't even take 80 amps.

Again, not trying to say you are wrong, but I think the data is flawed.

Don