Guru
Joined: 12/08/2011
Location: AustraliaPosts: 357
| Posted: 08:18pm 18 Jul 2025 |
Hi All
Good suggestion Phil.
My charging circuit (as noted in a different thread) is a simple SSR ON/OFF.
The Rpi reads the cell voltages (using a ads1115) and makes decisions based
on the voltage of all the cells.
Once I reach 95%, or one of the cells goes high, then I change to individual cell charging
using 4 x isolated DC step down converters.(to 3.6v)
These are NOT constant current,so it is up to me to find the cell voltage where I can safely
switch on the converters without them going over their current limit.(they shut down to a "hiccup" mode if over current)
I have a Battery internal resistance meter that appears quit good, so it would measure a shunt in 0.01 milli ohm and also measures voltages.(don't recall if less then 1 mV)
Sometimes I just can't see the wood for the trees.