......The concept of
......The concept of employing compressed hydrogen gas as an occasional range extender to an otherwise pure battery storage ,electrical driven vehicle , is a positive step away from gasoline and diesel dependant road travel , especially considering that hydrogen powered vehicles will still probably require battery storage to some degree, for storing energy from wheel brake disc regeneration ,and to power auxiliary platform systems. However, as mentioned above, the cost of operating and maintaining parallel systems of this complexity will add significant cost to the end product , in an already very price point sensitive market. Further , hydrogen storage at 350 -700 bar , in addition to the required fuel cell stack unit, will add considerable weight to the platform which will be a parasitic weight handicap for all shorter journeys. If we are considering to combine a fuel cell with a pure EV vehicle, would a hybrid one directional flow battery be feasible ? Metal flow batteries that use pure aluminium ( 99.9%), have potential for high energy density . Aluminium is abundant, can be recycled in a closed -loop, is very safe for transporting and on-platform storage. Downside of aluminium is the energy required for recycling / purifying the aluminium hydroxide sludge resulting from the flow battery process. Although the energy / temperature required ,could be generated by high temperature solar power systems. There are obviously key issues to consider for the management of all energy choices, however , if is essential and positive , that all the various options are respectfully being fully explored and holistically discussed in great detail .