The present invention comprises a stackable ballasted roof mounting solar panel mount unit integrally formed into a single piece. The mount unit comprises a plurality of generally elevated side walls of a ballast receiving basket. Each side walls defines a downwardly facing open channel that is configured to receive a corresponding side wall from a corresponding solar panel mount in a stacking relation. The mount unit further comprises a first pair of posts, wherein each of the first pair of posts forms a downwardly facing post receiving first mouth that is configured to receive a corresponding post from a corresponding first pair of posts of a corresponding solar panel mount in a stacking relation.