The VRB use is the tricky question. No direct precedents. It's easy enough to look at Largo and see if they've started to hurt with a low price, yet, they're not really mining for batteries.
The structure of a VRB can't be to expensive. It's just a shipping container with internal walls, pumps, wires, a computer, a membrane and some V2O5 in solution. For me, the unknowns are the membrane. Vince has stated that 9.889 ton of V is needed per MWh. At current prices (using $10lb here), thats about ($10*2.2*1000*9.889) $21,700 per MWh, excluding the box and wires. Compared to Li (after a fast/dirty Google search) with $150,000 per MWh. Consider the lifetime of each battery and you've got a bit of an idea of how good V is.
Vanadium price to go to $30/lb... Sure, maybe even $60... 1-exp(k/t) style relationship, as there is an upper bound on price growth which is dependent on the cost of box and wires.
The VRB use is the tricky question. No direct precedents. It's...
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