I noticed in your picture that the solar panels appeared to be partially covered. I offer this information in case you were not aware of how your solar panels output electricity. You may well have known all this and taken it into consideration.
Partial shading of even one cell on a 36-cell solar panel, will reduce its power output. Because all cells are connected in a series string, the weakest cell will bring the others down to its reduced power level. Therefore, whether 1/2 of one cell is shaded, or 1/2 a row of cells is shaded, the power decrease will be the same and proportional to the percentage of area shaded, in this case 50%. When a full cell is shaded, it can actually consume energy produced by the remainder of the cells, and trigger the solar panel to protect itself. The solar panel will route the power around that series string.