A blockchain that uses proof-of-work would waste far more energy than it would save, just on doing the accounting. What blockchain do you propose using that would have a minimal transaction cost, in watts and in coin?
If we’re talking about local charging of EVs, I guess that would be a little like putting a gas pump in my front yard for my neighbors to use. Probably going to hit zoning issues if you open that up to general commercial use.
How does a ‘solar energy blockchain’ know where the electricity used to run it comes from? There’s no difference between 120v ac coming from a generator or coming from the grid, or coming from a solar array.
why do I want to carry a printer with me? no. this sounds more like a point-of-sale device.