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Well that's good Jim Berry! I'm interested in a pack similar to the Tesla pack. It utilizes liquid temp control and consists of about 6800 Panasonic 18650 cells. Can you build a pack like that? Of course I don't want a 6800 cell pack. 2400 should do nicely.

I calculated 60 strings of 40 cells would give me a 148V pack and roughly 26Kwh, depending on the ah chosen. They're reportedly up to 4.1 now.

Tesla divides the cells into 11 modules of roughly 618 cells per module. The cells are in steel cylinders roughly the size of an AA battery. The cells have internal current limiting properties and Tesla fused each one on both terminals in case of a short somewhere.

A couple of reason why they chose those over the plastic prismatic cells is longer life due to the steel housing allowing it to cool better and supposedly they're about 1/4th the cost!

I'm very interested in this... I think anyway.
 
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