There is another about pumping water to lift a weight, similar to Gravitricity but using water.
Flow batteries seem good too but I need to do more research. They should use materials that are abundant, I see Vanadium costs are now through the roof.
Has anyone experience of flow batteries and specifically vanadium redox flow batteries.
Just after any experiences or information. What do we think will happen with Vanadium prices as they have risen recently.
Perhaps Zinc Bromide flow batteries would be better as zinc is relatively abundant. Just curious!
I specify plenty on commercial projects that are linked to access control systems. Not that make but im sure if you do the usual checks and look into what the security is around coding of swipes it should be ok.