I do not have any of the mentioned parameters in-hand, Nigel. It was just a question that I suddenly thought of:
Just like, why do we need a buck converter when we have proper overcharge protection? So, for instance, a 6V 3AH battery being charged by a solar panel that has the output of 20V, 40mA charging current
"Why do we need a buck converter?" as in, we will still be able to perform proper charging even though my solar panel outputs a very very high output voltage with 40mA charging current.
Like the mentioned example, charging the 6V battery after stepping down the output voltage of the solar panel to a level of...say, 10V better than not having the output of the solar panel being stepped-down?