As we can see, there is always, after the source, a voltage regulator, some diode, and batteries (reloadable of course), or contained capacitor amongst other things.
also:
electricity storage choices, pdf:http://www.electricitystorage.org/pubs/2002/Lisbon_May_2002_KEMA.pdf
a DIY solar lantern: http://noelbautista.com/blog/category/alternative-energy/
multi-powered autonom battery station
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