This use is unreasonable. Supercapacitors cannot be used in case of overvoltage. Long-term use will damage the supercapacitor and may cause a breakdown.
It is recommended to connect several supercapacitors in parallel. If it is a 6V solar panel, at least three supercapacitors must be connected in series. A balancing circuit should be carried out during the series connection process to avoid. overvoltage of a single supercapacitor.
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