A modular storage bin sweep system utilizing paddles to sweep particulate matter across a floor may comprise a sweep assembly including at least two units connectable together. The assembly may comprise a plurality of interconnected paddles, a power unit configured to the paddles, a drive unit configured to move the sweep assembly with respect to a surface of the bin below the sweep assembly. In some embodiments, a traction enhancement structure may increase traction of the drive unit on the floor. In some embodiments, a pivot unit is configured to permit a degree of pivotability of the axes of the units with respect to each other, and may be combined with a drive unit. In some embodiments, the power unit includes a rotary electrical power transfer structure configured to transfer electrical power to the power unit when rotating in the bin.