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Elf Sternberg
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Oh, no
Date: 2009-12-02 05:31 am (UTC)If I'm correct in estimating the sign has 32 x 80 LEDs, its peak power consumption is probably around 50W for the illumination, with the average more like 20W given the usual ratio of on-to-off pixels.
I suspect the system controller consumes a lot more than that, but if the whole thing consumes more than 100W average, I'd be surprised. Looking around online, indeed, that seems to be about right for various commercial LED signs.
So 100W continuous is 216 WH over the course of three months-- only a little more than a quarter of the energy generated by the solar cells in the same time.
And I gather Pemco had the sign before the solar panels anyway, so the panels are really a separate issue.
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