Originally Posted by StuM
Sorry, you've lost
I wasn't discussing charge rate, I was discussing (and the graph showed) discharge rate (a function of bank size/amperage draw) v voltage drop.
That said, Amps for charging
is largely a function of the size of battery
bank. Quoting a single
number like 60A is pointless without knowing a lot more about the system being charged.
And why would anyone deliberately only partially charge LA batteries?
I am sorry I lost
Most LA batteries are chronically undercharged because owners do not want to take the time to charge them in full or they use a default absorption voltage that is too low or absorption time that is too short or they just do not have the patience to let the batteries top off to a current
of 0.01C or so (which feels like wasting the 60 or 80 amp charger).
As a result there is sulfation.
As a result the curve that shows actual voltage sag at the batt terminals (which you are confusing with drop) vs discharge current
is much worse than the one in the manual.
I am not saying this is not avoidable (eg using solar
to for the back end of the charge after engine/gender early in the day, or just a lot of solar). I am saying it is most common with the sort of owner who expects to "extract" rated amps from a charger
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