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Naum said:
Aren't there solarpanels these days that work even on cloudy days?.

All solar panels do, when clouds cover the sun, the solar panel doesn’t stop producing power. It just reduces the output of energy. The thicker the clouds, the less power the system will produce. Yet when the sun shines through the clouds, solar panels still get direct sunlight plus light refelected from the sun meaning, you can in some few cases it's actually possible to get more solar energy out of a cloudy day than a sunny one or at least make up for part of the reduced energy output.