In one embodiment, a connector assembly comprises: a connector; and a pair of side collectors, each comprising a connector engagement region having a size and geometry to mate with the connector so as to hold ends of two adjacent panels together; and a panel engagement region comprising a receiving area and having a size to attach onto an edge of the panel; and a clip, wherein the clip has a base that can be attached to a support, an engagement, and a stem extending therebetween, wherein the engagement has an extension projecting from a side of the engagement, wherein the panel engagement region further comprises an opening in a joint wall on a side of the panel engagement region opposite the receiving area, wherein the opening is configured to receive the extension of the engagement.