It certainly could have been done more professionally, with better calculations on location and wire gauge to operate/charge more efficiently, with less voltage and amperage losses. ie more amps and voltage bang for your buck, with less losses. Which is what most of the engineer types that post up here in the Tech section would have suggested.
Clear insulation suggests lamp cord or speaker wire used in the install, I have no idea if that is exterior wiring grade rated, or rat/rodent proof.
Does not seem very well thought out, from design to implementation, to lack of fasteners used on the panels. Something should be used that attaches the brackets and binds them to the framework with metal fasteners, or something structural underneath the rubber roof like frame work or rafters.
