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Obviously we do not recommend installing the solar panel in a shaded location. However, what you have suggested would work. The only downside is having to remember to move the unit every day and the lack of charge and effect it will have on the batteries.
We do sell the attachments: https://www.thesolarcentre.co.uk/catalog/Solar_Fairy_Light_LED_Attachments-55-1.html
Both options would work. The 300 lights have a bigger battery than the 100 to support the larger amount of LEDs.
Everbright Solar Fairy Lights - Multi 100 LEDs
£29.99