I thought it would be interesting to show the difference between the output between two days when one is sunny and the other covered in cloud.
Yesterday was a very sunny day with only a very short spell of cloud. The electricity generated by our 3kWp PV solar panels was over 7kWh. Today is a very dull, wet and cloudy day with no sun. The output has been 0.6kWh so sunny days give at least 10x better solar PV elecricity generation than dull cloudy days, at least in winter.
Sunny day : 7kWh
Cloudy day: 0.6 kWh
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