Whirlpool forums, Greentech, Solar, Energy
What an excellent resource these forums are.
Ask a question and have people offer their advice and experiences.

Whilst it's mostly Australians, there are others from around the World who have information to share.
It's all completely free. No ads.
Simply register, read the forum rules, check out some threads or search old threads for what you are after.

The solar specific forum is here.

In years gone by this forum was heavily influenced by solar reps and as a result, advice wasn't the least bit impartial.
Most have left now of their own accord, or been booted off by moderators.