Conventional solar modules are made up of a number of solar cells electrically connected using metallic busbars. The solar cells on conventional solar modules have gaps around them and busbars typically cross over the cells to link them together. Shingled solar modules have layers of solar cells which touch each other and electrically connected using an electrically conductive adhesive (ECA). This eliminates the need for metallic busbars. This method means there are no gaps between the solar cells increasing the surface area of the silicon cells in the solar module. Plus there are no busbars covering the cells which reduce the light on the solar cells. This improves the performance of the solar module.