That is exactly why I prefer the term "Dump Load Controller" to "Diversion Controller".
"Dumping" surplus power from the battery is usually understood.
"Diverting" power causes confusion.
It could imply it 'diverts' the excess power, or it 'diverts' all the charging current.
Diverting all the charging current is 'stupid' at multiple levels. And it tends to involve automotive grade 40A relays, most often in parallel for 80, 120, and 160A versions.
For links to name brand (Morningstar TS-xx, Xantrex C-xx, etc) schematics, part numbers, Gerber files, operational parameters, etc, the best bet would be to contact the company directly and ask where they posted them.