You don’t really need multiple solar panels, I would add a small battery, Perhaps lead acid for durability, and a solar charge controller to keep it at the proper charge level. You should be able to get all of this off-the-shelf.
After that, just get an Arduino or a PI zero, and a relay shield or hat, the code to start once an hour run for a few minutes and then put the processor to sleep is relatively straight forward. And, although this is overkill and simpler circuitry could be designed to do this, it would require more experience that what you seem to have, it’s not necessary unless you are designing a sellable product, and it would save you a lot of aggravation later on. Particularly if you feel compelled to modify the behavior in the future.