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I recommend the report on which I based my statements:
https://www.gov.uk/government/publications/fire-incidents-involving-solar-panels
Having a high-voltage power-generating installation on your house is simply larger risk than having a washing machine, and that's regardless of rather miserable UK building standards.
Batteries are a completely separate topic and while the Kent opposition rhetoric of "nuclear explosion" was simply idiotic, the core of their concerns were kind of confirmed by latest Tesla fire.