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Just to clarify one thing, using linear voltage regulator like LM7805 isn't the most efficient way to regulate voltage (although it's very convenient). Linear voltage regulators' inefficiency increases as both voltage difference and current draw of the system increases in general. Plus, this configuration won't work if the solar cell generates voltages lower than 7V. If you are looking for more efficient way to charge your electronics, then you should consider using "Buck converters" :) Hopefully it helped.
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