I have just received a SmartSolar 75/15 MPPT.
I made a close examination of the charger and noticed a pen marking of a P on one rear corner (see photo).
Next I looked at the screw connections and they were not new. Discolouration on the PV and Batt screws plus deformation of the screw slots (see photo).
So before I install it, are these defects normal for a new product from this company?