It seems clear that na-ion batteries will replace large scale grid storage especially in cold climates. This isn't another hyped up battery.
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If you put LFP batteries packed into a cargo container next to a solar farm in California or Nevada, a significant portion of that container will be piping (to every cell) and compressors for a beefy AC system. LFP cells don't like to work hot.
This cooling system will take up a significant portion of space, power, and worst of all, of the total maintenance cost of the entire battery system.
An identical system made of Na batteries will take 2 containers, but need no cooling power and basically no maintenance - no moving parts, unlike the compressors and fans of the LFP pack.