by Burgerman » 24 Jun 2017, 20:50
Maybe. But is it not possible to have a reference voltage chip cheaply of some kind? And many chargers charge at CV and then stop charging at anything from say 3A down to 1A. Even supposed mobility chargers. That really should be around 1000thC based on capacity, so a 73Ah MK would be about 73mA termination. Or 8 hours for thermal runaway safety on old or warm batteries that never drop low enough.
I have 3 invacare branded upright chargers here. They (two of them) charge at 8A and have a CV of halfway between AGM and Gel. So too high for MK, too low for AGM. They are supplied with their own MK equipped chairs. The long loom, and bus cables on the chair, mean the battery sees an ever increasing CV voltage... its too low straight after CC stage, while at 8A, and too high while sat for hours at 2amps downwards. Which I may add is where the green comes on. They remain charging at CV for about 12 Hours though, long after the green. At about 28.66V. And then drop to float after this of 13.7V. So ok for completing charge but too high for storage... The 3rd charger looks the same, has a timer for CV stage, is 28.8V and no float.