A heat exchanger assembly includes a first stage heat exchange section defining one or more intakes for receiving a fluid. The first stage heat exchange section includes one or more preheater elements radially insertable into the first stage heat exchange section with respect to a centrally disposed axis of the heat exchanger assembly. The preheater elements define one or more preheat flowpaths extending radially inward from the intakes. The preheater elements transfer thermal energy to or from the fluid as the fluid flows from the intakes through the preheat flowpaths. A centrally disposed second stage heat exchange section defines an axial flowpath that is fluidly connected to the preheat flowpaths to receive the fluid from the preheat flowpaths. The second stage heat exchange section transfers thermal energy to or from the fluid as the fluid flows through the axial flowpath.

A hybrid solar panel including at least one single-piece section resulting from extrusion, the section including a wall forming the aforementioned bottom and top faces of the heat exchanger, and the section includes: a plurality of longitudinal fins extending substantially perpendicularly from the bottom face of the heat exchanger or from the aforementioned wall, andat least one portion of the circulation pipe directly connected to the bottom face of the heat exchanger or to the aforementioned wall, the portion of the circulation pipe extending substantially parallel to the longitudinal fins.

A solar panel assembly includes a substrate and a solar array coupled to the substrate. The solar array includes a plurality of photovoltaic cells. An optical layer is disposed over the solar array. The optical layer, the solar array, and the substrate together form a solar assembly. A frame surrounds the solar assembly and includes a plurality of frame members. Each frame member of the plurality of frame members includes an arcuate member that forms an aerodynamic outer edge of the frame member.

A docking station for use with a solar tracking system includes a frame configured to selectively support solar cleaning equipment thereon and a mounting bracket operably coupled to a portion of the frame. The mounting bracket maintains a gap between adjacent edges of the frame and an adjacent solar module, and the frame includes a width that approximates a width of the solar module.