[blitzar]

If you live in Australia, have a house and roof, you're a bloody idiot if you didnt install solar.

[bot403]

You don't even need a roof. If you have enough land then a ground mount system is more convenient and easier to maintain.

[pibaker]

I think by having a roof GP meant lives in a house instead of an apartment. If you don't have your own roof you probably don't have land either.