Pigeon infestation has become one of the biggest issues that can damage a PV array, permanently. The nests are usually built over DC connectors causing DC leakage. Pigeon waste can damage DC connectors permanently. If left unchecked the array would have to removed, rewired and refitted to get it fully operational again.
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Even when mesh was fitted around this PV array the damage had already been done with the array being fully removed and rewired and refitted. With the original mesh fitted again.