To me, the main three questions are round-trip efficiency, max storage time and environment impact.
https://en.wikipedia.org/wiki/Vanadium_redox_battery mentions 75% to 80% efficiency, though I don't know how well that applies to such big systems.
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.194... mentions a better environmental profile compared to lead acid batteries, but that might be a low bar.
To me, the main three questions are round-trip efficiency, max storage time and environment impact.
https://en.wikipedia.org/wiki/Vanadium_redox_battery mentions 75% to 80% efficiency, though I don't know how well that applies to such big systems.
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.194... mentions a better environmental profile compared to lead acid batteries, but that might be a low bar.