A flexible height-adjustable clamp for clamping a solar panel to a support structure or base, with flat surfaces on the upper and lower parts of the clamp, the upper section clamping on the panels; and the lower section mounting against the base; with a hole through both flat surfaces for bolting a connector through the surfaces to secure the clamp and panel to the supporting structure; and a flexible section connecting the two surfaces in the form of an arc or folded section; with mechanical stops to allow positioning to against said panel.