Reply to post: Re: Roof tank?

Graphene solar panels harvest energy from rain


Re: Roof tank?

Nope - not cost-effective. Apologies, but I can't find the relevant bit from the xkcd site, but Randall Munroe looked at this idea (which many, many people think of at some point in their lives) and IIRC fount that it'd take decades if not centuries to recoup the costof installation.

Right, I'm off (out) tolunch...

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