if you use google you can: skoolie.net + wire , or skoolie.net + wiring
that's how I search web sites...probably a newer way to do it
the leds and fan (assume 12v computer fan), and a charger port wont pull crap for amps (maybe 2 or 3 total) you can use really small wire here
the sureflow will be your biggest draw (5-10 amps guess)
the Iota 55 amp convertor will give you 55 amps of usable 12v when plugged into 120V
why so many batteries, for those loads?
a big invertor for 120v?