Solar isn't the best choice, so I hope that you've already looked into it enough that you understand the initial investment needed and the risk factor; the panels are pretty easily damaged in adverse weather conditions, no matter how it's advertised. Coin staking is a pretty nice passive income, but most of the stakeable coins aren't traded much, with the exception of PPC.
If you're looking at solar for fun, go ahead- I run a few gridseed miners off of a battery in my garage, and it runs just fine. It's definitely interesting to see solar panels get more and more efficient; maybe someday actual mining with them will be possible.
Well solar is a bit expensive in the terms of purchasing the panels and the installation of them at your place. But, in the bright side it may save even more energy than using conventional power sources. Still, I do not have the kind of money yet to set up solar panels so my options would be limited right now towards using external batteries to power the miners.
As for PoS, I think that ETH would be great to stake once it hits this stage, since nowadays it is the second most actively traded cryptocurrency on the markets.
