I'm working on special version of my BMS multi slave pcb for this project. it will fit into the right hand end of the case where the normal orange cell end connector board would go. I will use two boards capable of monitoring 26 cells each giving a theoretical maximum of 52 cells although this number of cells would be a very tight squeeze into the case! 50 is a good snug fit for these 20ah a123 cells and is the same as I have in the PHEV. The rally insight runs with 52 cells but that uses 15ah lifebatt cells.
I think the voltage drop under load will be lower with the A123 cells than the lifebatt due to the construction, and testing on the endless sphere site has shown incredible performance. So 50 is around the optimum i think.
Endless-sphere.com • View topic - Testing the big 15 and 20Ah LiFePO4 cells is tough! *Pics*
Hopefully pcb layout and production will get done while I'm away and i can build up the boards on my return. I have some low temp solder and flux so will play around with some soldering of aluminium takeaway food containers and cell tab offcuts to see how it works.
