Solar energy and mining are not comparable things in themselves, mining hasnt left so long to live, but Buterin talked about this. It is clear, even without any calculations, that mining on solar panels is extremely unprofitable today due to their high cost, but despite this, they have a clearly more bright future.
Do not drag solar panels to mine! If you want to save, then this is not the best way.
And to provide enough power, the cost will be too high. So in order to recoup the panels and batteries you will rather grow old!))))