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Batteries are the storage place for the energy, so it can saved and used when the sun isn't out.
The batteries would work with or without the sun. It dont make since!!
But not for long. The solar power charges and re-charges them over and over without the use of electricity, which...
I don't "get" why there has to be Braille directions at banks' drive up teller windows. C'mon! I know ADA requires it for businesses when there is new construction or renovation at public access facilities, but let's agree it is highly unlikely for an un-sighted person to utilize the drive up...