- 📖🕓 ≈ 3 min - Most recently, this series of articles was about the Proof of Concept (PoC) for the ZENNER IoT Photovoltaic (PV) Gateway Outdoor carried out with the first prototypes and the insights gained from it. Now I’ll show you what its final setup looked or looks like after a few more tests, which is already being used in customer projects. Material selection for further prototypes Based on the findings from the PoC, a material selection was made