Here is the "final" (HAHA!) version 15.3 of the Special Freddy NHW10 EQ charger. It has been working quite well for some time now but it still needs to be considered an experimental design. Don't just build one like it unless you know what you are doing!
See these previous posts for more details: https://www.endless-sphere.com/forums/viewtopic.php?f=14&t=12764&p=284578#p284578
and https://www.endless-sphere.com/forums/viewtopic.php?f=14&t=12764&p=272207#p272207
Thanks again to "The Laird" and Mike Dabrowski for all the help!
A permanently installed harness (removable) now allows to plug the charger in without any opening of the battery. Diodes protect against electrocution risk.
Click to enlarge:
The next part is not yet built and will allow the cooling impellers to be run by a solar panel when the car is parked in the sun. This should reduce imbalance due to differential heating of cells. It will need another diode somewhere I think.
Click to enlarge: