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It could be an interesting DIY project. I recall a discussion that said owners could easily replace individual solar cells. It might be possible to build a window insert panel if we knew how they are wired – I’m guessing parallel. Remove one of the dashboard cells and attach the panel you constructed to the now vacant receiving terminal. We would need to know the wattage limits of the receiving terminal(s) and the type of terminal used to connect everything. But watt do I know…..