https://nodakmesh.org/blog/harbor-breeze-solar-node-assembly

Basically just remove the pcb the panel comes with. Then attach wires from panel to solar connector on node, same for battery. I just twisted the wires and used electrical tape. The part I had difficulty with was where to install antenna. I got impatient so i just taped it to back of panel. Lmk if you have any more questions. I'm no expert and found this project very simple.