That's an absolutely absurd characterization of both YouTube and actual teaching. YouTube is dominantly entertainment/personality based "edutainment" at best,

That's an absolutely absurd characterization of both YouTube and actual teaching. YouTube is dominantly entertainment/personality based "edutainment" at best, based on what seems to percolate to the top and be promoted. There's zero feedback outside comments (standard warnings about comment sections apply here). The right way to teach complex subjects is a more interactive process with hands on material/learning/actually solving the problems yourself. In the case of solar and energy systems, you can do this, but if you don't have some basic EE background, it would be wise to go get that first before listening to some slick talking huckster selling their wares. WHY do we size wires the way we do (either for temperature limits or for voltage drop, depending on the application)? What's wrong with a 5000W 12V inverter (500A or so, and the I^2 components of resistive losses, paired with the voltage drop from those)? I don't think a human lecturing blindly into the void optimizing for "engagement" (whatever metrics those are based on this week) can competently teach any real detailed material, no. That doesn't mean that people can't teach complex material. It just means YouTube is not the place or medium for it.