Morningstar MPPT Charge Controller slow charge
Hi Folks, I have a 25 amp MPPT charge controller. When I First connected it it would charge at full current of my two 135watt panels of 8 amps each. for a total about 10-12 amps because im running 100 ft wires.
After the first day, My batteries are drained maybe 20-30% and the following day it would only charge around 4 amps or so. If I reset the controller it would charge at full current again 10-12 amps. Is this right? Could it be my batteries are too old and causing resistance and fooling the charge controller? I had swapped the unit from morningstar and even updated the firmware and it still does the same.
The batteries are 5 or 6 years old, sunxtender AGM 104 amp. I use to use the 30 amp PWM charger from morningstar.