Hello all. I was wondering what the viability of a fuel cell (probably hydrogen) would be as a range extender. It occurred to me that for highway cruising speeds, 30KW is more than sufficient. 20KW would even be enough to be highway legal, but assuming you want to be travelling at 70mph | 110km/h or more, 30KW is all you need. I haven't been able to find much in the way of cost of a fuel cell, and yes I am aware that producing hydrogen is quite inefficient compared to charging a battery. But if used only for those occasions where a fast charge is not possible then such a device would be very handy. Portable units that can also mean these devices need not be 'owned' but possibly just rented on an as needed basis. Any serious pitfalls to this idea?