agm battery charge issue
what would cause a AGM battery to reduce its charging amperage, without the voltage reaching the set voltage cutoff in a CC mode stage of a charger example, battery is at 13.6 yet a pd9245 in boost...
Forum Discussion
time2roll wrote:LittleBill wrote:Yes that is the nature of resistance. The more amps the more voltage drop.
yes but the v drop changes depending on amperage, it was doing 10 amps at 14.1. v drop doesn't remain static.
Eventually the amps will drop to zero and the converter output and battery will be equal voltage.
Need to address the resistance with an improved battery connection, fatter wire or move the converter close to the battery. Or all three.
Been through all this over the years.
yes but this is not the concern
v drop and resistance are the highest at low voltage yes?
at 12.8v at the battery it was putting out 46amps.
resistance goes down as amperage goes down right?
and on that same path voltage drop lessens. right?
so my problem should be going away as the battery comes up to charge, not making it worse.
my issue and my confusion, again is around 13.6v at the battery. PD is doing 14.4, but the amperage is going down around 20amps and still tapering, PD should be cranking the amperage up to get to 14, but its not doing it.
according to voltage drop calcs, v drop is cut in half during this.
I have never seen a charger cut its amperage before getting the voltage up to its cut off point. I can force and confirm the pd never left 14.4 at the converter.
