Both Thermal and Photovoltaic panels that are faulty will produce an uneven thermal image.

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Photovoltaic systems:   Any hot spots are likely to indicate damaged cells so the whole panel / array may be underperforming.

Thermal systems.   Either hot or cold areas may well be indicative of blockages or air locks.  Loss of vacuum in tubes or areas obscured from light will also register a temperature difference.

 

 

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