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Look at the picture of this house. How much do you think those solar panels cost?
http://www.solarcity.com/campaigns/2011/season/july-1000.aspx?thankyou=1&cm_mmc=SEM-_-Google-_-MD-GreenEnergy-_-covsolggl88100000004300s&
I've heard that solar panels are extremely expensive, and they take decades to finally pay for themselves in $ energy savings. Well, how much do you think those panels cost for that house pictured?
I can't tell whether there are more panels in the system than shown in the picture, but I can see 27 of them.
To get a ballpark figure, I'll assume the panels are this type http://www.sunelec.com/suntech-solar-panel-190-watts-2600-vmp-p-1668.html at $320 each. This is not at all an unusual price. That's $8640 for the panels alone (retail price). I would add another $3k for the balance of system, so that's $12k or so. Labor to install would vary by location. Let's say $4k. It would be more where prevailing wages or demand are higher, less elsewhere. So that's $16k.
If in the US, there is a 30% tax credit, so that knocks the price back down to $11k. If you're lucky enough to live a place like Honolulu, you get an additional 35% incentive, so the net price would be more like $6k.
How long it takes to pay back especially depends on location. In a place where the payback is 20 years or more, a person typically wouldn't install solar electric. In the Honolulu case, it's about a 4-year payback.
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