The SmartSolar MPPT RS solar charge controllers are Victron's solution for systems with large series connected PV arrays charging 48 V DC battery banks. This product is perfect for large off-grid, and ...

Also a couple of generic NPN transistors to shift the level of the 5V RS-232 signaling from the Victron unit to the 3.3V needed by the ESP32. A level-shift board could be used instead of the ...