In Australia, I think a 13kW install would be quoted at about US$10k or less. We put 5-6kW on at home, and 6-7kW at my small office building. Usually comes out

In Australia, I think a 13kW install would be quoted at about US$10k or less. We put 5-6kW on at home, and 6-7kW at my small office building. Usually comes out to around $1/W.