Very true. I've tested this thoroughly and it won't. Obviously there's always a residual risk, which I've mitigated by moving the panel to a window further back

Very true. I've tested this thoroughly and it won't. Obviously there's always a residual risk, which I've mitigated by moving the panel to a window further back on the roof. Then I'm going to see if the panel's moved after a year. Another solution would be outdoor glue, but that messes with the ephemeral nature of the project. Thanks for the input!!