Had a phone conversation with the seller today, he said they're power modules from a decommissioned solar plant and that the batts were pulled because the plant was decommissioned - not because they went below their 80% of capacity spec. He went on to say that he has 500 or so now but there are truckloads inbound, and he's the one supplying the other vendors with the exception of Techdirect in California. The shipping is a flat rate per order.
He seemed like a good guy and happily provided as much information as he had, which wasnt much. I asked about buying a spare in case I got a dud and he said not to worry about it.
He also said it's a very bad idea to use the onboard circuit board traces for your balance leads as the circuit traces are far too small to handle the amps that balancing could place on them.
I'm thinking using self-tapping screws directly to the bus bars is probably the best bet. Which also avoids the complexity of messing with the original connectors.
Wish these werent so dang heavy though, I'm gonna have a heck of a time getting a dozen of these down into my basement.
I wonder about the feasibility of removing the cells from the case while keeping them strapped together, take up a lot less room that way too. It'd make doing a 16s6p easier w/ a 16s BMS per stack. Awful lot of BMS's though but it does have the advantage of keeping an eye on each cell.
