Abstract: Apparatus for installing a solar panel array in parallel rows on panel support structure, as for solar farms, including a lift-and-place vehicle with characterizing features for moving between and along rows of support structure. Such vehicle includes a driven ground-engaging base, a lifting mast extending upwardly and in a fore/aft direction to define a panel-loading space therebeneath, a liftable trolley beam secured to the mast over the panel-loading space and extending laterally between adjacent rows, a traversing trolley movable along the beam, and a panel-placing carrier suspended from the trolley for up/down and lateral movement of carried panels. A panel-pallet vehicle is hitched to the lift-and-place vehicle, extends under the panel-loading space, and has a pallet carrier adjacent to the panel-loading space.