This will waste energy.
If the solar cells are connected in parallel, it is better to connect a diode to each panel, and all three panels should be placed to be illuminated by the sun at the same time, otherwise, one panel will be illuminated and the other will not. If it is illuminated, some current will flow through solar cells that are not exposed to sunlight, causing wastage.
Solar cells, also known as "solar chips" or "photovoltaic cells", are optoelectronic semiconductor sheets that use sunlight to directly generate electricity. Simple solar cells cannot be used directly as energy sources.