[freetime2]

Solar Roofs can still pay for themselves, it's just a much longer pay back period than with commodity panels. So I guess the Solar Roof strikes a balance between economic benefit and design that makes sense for some people.

> Just to tell my friends how I'm saving the planet?

This is a really uncharitable framing that I often see repeated that wealthy people are only motivated by how other people perceive them. And sure, that probably plays a part for some people. But maybe they just feel good about saving on their electricity bill in the long term and reducing their carbon foot print - even if it's not the most economical or environmentally friendly option available?

[akerl_]

It's possible the math works out differently for people whose roof already needs to be replaced, or for people whose roof can be nearly totally covered with generating tiles.

In my case, it's been a while since I crunched the numbers but the pay back period is effectively infinite, assuming that had I not bought the roof I'd invested the money instead. This is especially true as temperatures continue to swing more and more widely (winters that push below the efficient window for my heat pumps are murderous on my banked solar energy) and more states and electric companies switch from net metering to newer rate plans.