All good points gents, but I'm after an unattended automatic solution that can determine all the info we need including.
Subpack charge capacity at 5ah rate
Subpack discharge capacity at 5ah rate
Subpack self discharge rate
Number of cyles before no further improvement in specs.
It will record this data and be available in a text file we can glance at for a full pack report at the end of a week say. The time doesnt matter that much and it's easier for my choosen pic/axe to manage one charger/discharge circuit.
It will allow simultaneous charge/discharge from different subpacks. So after you have discharged subpack 1 at begining of test you can then be charging it whilst no 2 is discharging, that will speed things up by 50%.
I realise it's quite relay intensive but you can get some pretty powerfull small relays nowadays.
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