Systems and devices for securing a photovoltaic module to a mounting rail

A clip for attaching a frame rail to a mounting rail in a photovoltaic (PV) module system, comprising:

• a first arm including a proximal end and a distal end and defining a first slot portion;
• a second arm including a proximal end and a distal end and defining a second slot portion;
• and
• a connecting body that connects the proximal end of the first arm with the proximal end of the second arm and defines a third slot portion, wherein:
• the first, second, and third slot portions together define a slot with a perimeter that is fully enclosed by the first arm, the second arm, and the connecting body, the slot being configured to receive a mounting rail flange and a frame rail flange;
• and
• one or more of the first arm, the second arm, or the connecting body is configured to elastically deform to decrease a distance between the distal end of the first arm and the distal end of the second arm relative to each other and apply a spring force to the first arm and the second arm away from a longitudinal axis of the clip when the clip is in a compressed state.