Disclosed herein are embodiments of modular racking systems for solar panels and in particular, modular solar panel racks, racking systems, arrays of racks, kits and methods of use. One embodiment of a modular solar panel rack comprises a plurality of discrete ballast holders and a plurality of panel support members each having two upright portions, a transverse portion contiguously connected between the two upright portions, the connection such that the transverse portion is non-perpendicular to the two upright portions, and a retainer attached to the transverse portion and configured to retain a solar panel. Each of the plurality of ballast holders is connected to no more than four panel support members, each ballast holder perpendicularly connected to one of the upright portions.