Apparently, this billboard in San Francisco isnâ€™t just hype: it is, in fact, a power plant, using 20 solar panels to generate more electricity during the day than it consumes lighting itself at night. On a sunny day, the billboard generates 3.4 kilowatts of energy, which is just about enough juice for a family of four during the day. If itâ€™s cloudy, the output drops to 2.5 kilowatts. PG&E does not, of course, say how much the solar panels cost to buy, install, and maintain. My guess is that itâ€™s in the â€œyouâ€™ll recoup the cost in a decade or soâ€ range. Still, since weâ€™ve got ugly billboards set up all over the place anyway, wouldnâ€™t it be great if they could be put to some practical use besides annoying consumers out of purchasing whatever they happen to be advertising?
thanks Ohgizmo for the info
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