I am puzzled here and need some advice. We recently installed new AGM batteries
for starting (engine and genset). These batteries
are charged by the standard alternators on the engine
But now, I am installing a new inverter/charger and the charger
has a second 4A output that I could use to charge them. This output is not very intelligent, I think it follows the main output voltage (steps) at just a little lower voltage (echo charge).
Is it wise to connect this to the AGM
cells? Or, in other words, are AGM's happy when they are kept at 13V or so for long periods, like months? We used gel batteries for this before and they were only charged by alternators. They kept their charge for long times, 6 months once, and no trouble starting the engine
. I tend to feel like not connecting this "echo-charge" output to the new AGM's either but would like your opinion!