I have a Mppt 100/50 and my charging amps have dropped down to a maximum of 7 or 8 amps when it used to get between 25-30 amps for 600watts of solar. I still get high voltage. My BMV is showing a current draw on the battery while the battery is being charged of up to 27 amps. No load is attached to the battery. This just started happening...before I was getting close to 30amps an hour charge from my panels.
My battery still charges to 100% but slower than before. After it is charged the current output on the battery slowly falls back to 0amps with no load connected.