Vanadium battery is an solar container battery

Called a vanadium redox flow battery (VRFB), it's cheaper, safer and longer-lasting than lithium-ion cells. [5]The battery uses vanadium's ability to exist in a solution in four different oxidation. The tanks of reactants react through a membrane and charge is added or removed as the catholyte or anolyte are circulated. The large capacity can be used for load balancing on grids and for storing energy from. Flow-battery makers say their technology—and not lithium ion—should be the first choice for capturing excess renewable energy and returning it when the sun is not out and the wind is not blowing.