I'm the owner of a MPPT 75/30, who was working really fine for 2 years. I have Lithium battery 100AMP connected to the MPPT and a solar panel 200W in 12V.
Battery : 100AMP Lithium
MPTT : 75/30
Solar panel : 200Watts
Settings : Absorption : 14.5 - Float : 13.3
Here my problem : When the batterie start to be full, and I'm going in absorption mode, the voltage sometime rise to 15V or even 16V! I have notice it first by checking historic and after...
I arrive to track it to live. The solar panel was in absorption with 0 watts, and out of nowhere, surge to 90watts, and voltage switch to 14.4 to 15.5 for example.
Notice that this situation happened without using any device in the same time.
Do you have an idear if it's normal or not and how can I fixe it?