pnichols wrote:
BFL13 wrote:
Phil, you charge at the Float voltage so of course you don't see the overcharge thing.
BF, I base what I said on - after the AGMs have been fully charged on whatever charger - I start up the cold V10 engine such that it's alternator jumps to, and holds, around 14.4 volts for awhile. The RV batteries' ammeter doesn't budge ... it just sits there still showing near zero amps acceptance by the batteries. Recall that this is with a 130 amp alternator that is capable of delivering around 70 amps at engine idle speeds. (The alternator is over-driven, so it spins at far greater RPM than what the big engine is idling at.)
That's what I mean when I say that my AGMs seem to hit a solid wall preventing the acceptance of any more current once they're full up.
When I see it, it is after many hours of tapering amps at 14.x (14.4 or 14.8 depending on which AGM) till amps are down to 0.5 Then soon after hitting bottom, amps start back up again. Before that, you do test to see if your are all the way full by doing that higher voltage and watch amps jump but quickly fall back again. Mex calls that hitting the wall. But if you leave it at 14.x amps will go back up and the battery heats up.
I think all we are talking about is how long that takes and I get the notion that your "awhile" doesn't last long enough to see that--which is good! You don't want to see that.
I doubt you are running your alternator charging that long to see the overcharge set in. Not too clear on that.
