How many batteries
in the pool? Could you have one that is dying? A battery
will often charge up to full, but have no strength CCH after if there is a cracked cell in it.
You could try removing each battery one at a time and see if the Amps stay up, then just swap out that one battery. If after swapping each battery out and you find nothing, then I would think it is a problem with your EMON battery monitor
Note: I am NO expert on this, just throwing out some ideas.