The invention relates to retention systems and, more particularly, for a modular retention apparatus, system and method for securing and leveling a photovoltaic (PV) panel and other objects on a wall, rooftop and other structure to secure and ground electrically. The photovoltaic panel retention assembly utilizes a solar cap with one or more integral elongated flange extensions of a predetermined dimension to provide spacing between PV solar panels and/or to stabilize the solar cap from tipping under installation forces and load in use. The flanges extend through a support bracket configured with a base portion to support adjacent PV panels in a PV panel array and a base platform portion. The solar cap comprises integral teeth on a surface of the solar cap spaced apart from the flanged projections to locate the teeth adjacent a frame of the PV panel for electrical grounding thereof.