You can hit a solar plant with a missile, and it can be back in operation with a reduced capacity within a week:

https://www.wanhossolars.com/news/ukrainian-solar-power-plan...

Honestly I'm not sure if it would take a week in most cases, just took this long in this case. Its really not worth going after the panels with a conventional missile. Maybe something that explodes well above it and litters it with ball bearings would be far more effective.