https://media.ccc.de/v/36c3-oio-166-ff-esp32-openmppt-new-freifunk-isems-mppt-solar-controller-with-integrated-wifi
FF-ESP32-OpenMPPT - New Freifunk-ISEMS-MPPT-Solar-Controller with integrated WiFi - media.ccc.de
The Independent Solar Mesh System has a new hardware that will bring the power consumption, space and cost requirements of low cost WiFi ...