Whilst looking to finally buy solar I came across SolarQuotes.com.au, not to be confused with similarly named companies. I have no relationship with them excepting they arranged some quotes for me. They seem dinkum and have a number of excellent educational videos on youtube, and their website has an awesome amount of information on products and installers, not all of it immediately obvious. There is commentary on a wide range of solar products and reviews of products and installers, both in and out of their network.
@BrendanMays informs Choice is soon to release their own solar videos, to which I look forward, but until then here is a youtube index including mostly Solarquotes tutorials.
This one is a good place to start
I met with some sales people and afterwards watched the videos and far more started to make sense, so watching can be time well spent. I was better able to assess what they were each selling, eg financial value, expensive best practice solutions that are not required for my location, glossed over relevant bits (that might or might not have mattered in a practical sense), and enabled me to ask meaningful and important followup questions about their proposals and processes.