A new solar panel creates more energy, and a thankful discovery. During the installation of the 50 Wp panel, I discovered an unclean line connection at the 1st 100 Wp solar panel. It was the reason for more than a year accepted but insufficient charging situation. With the 2nd panel and the now clean wire, the current strength of about 0.7 A could be increased to an adequate 3.0+ A. In full sunshine this is a quadruple of the energy supply. The charging time of the batteries will be shortened by a few days. In addition, a large 4.7 Ah notebook can be operated almost lossless during the day.
The new panel in the middle of the picture, on the left a 15 Wp panel for a pond pump. Both panels are connected in parallel.
Also new is a 47 Ah car battery, which can serve as a reserve for the two 100 Ah liquid / gel batteries.