Caution using the flat flexible panels. There is technical data showing early degradation of the solar cells from excessive heat build-up due to not having good air circulation under the panel.
While they are aesthetically pleasing being less conspicuous, and fit well to curved surfaces, that tight fit is a known detriment. As with any electronic component, heat is the enemy. Ideally you want maximum sun energy in the form of photons, but you want to dissipate heat energy.
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