using a salvage Tesla battery module

GordonThree wrote:

ependydad wrote:
My concern with re-using wrecked packs is not knowing what kind of internal damage they might have ESPECIALLY after reading about this golf cart battery fire/explosion on the Escapees forums:

http://www.rvnetwork.com/topic/130707-trailer-fire-need-some-help-please/?do=findComment&comment=936293

Definitely not something to take lightly, and without some technical understanding.

If I were to do it:

1. The pack would be fully disassembled, down to it's smallest module size.

2. Each module would be checked to see if it's in-spec in terms of voltage, and for signs of physical damage.

3. Each module would be charged stand-alone, outdoors, to full capacity, and then drained to 20%

4. Modules would be assembled to achieve target voltage / current, and then charged as a pack, outdoors, and then drained, as a pack to 20%

5. A BMS with over discharge, over charge and temperature monitoring would be employed.

Only then would I be comfortable putting pack built from a wreck into service.

This is what Juan did when he got the battery out of its casing. Tested all 48, later 49, modules, and found that all were good. He is meticulous in his research and found out all about this =before= he even bought a battery. After running more calcs, he decided that he needed to add that 49th module to make the voltages work out correctly. It's all documented in his blog posts.

Also, Juan told me that part of the competition for these batteries is from off-gridders in S&B houses looking for inexpensive battery banks.

Lyle