After I found out the pinout of the Sunny Boy 2100TL inverter I build the UART piggyback and it is working fine. Now, it’s time to build the RS485 version.
Because I didn’t want to use an external power supply for the galvanic isolated output side I used an (expensive) [...]
Last month I did buy a 2kW photovoltaic system for my house. To connect the pv panels to the grid I bought the Sunny Boy 2100TL inverter from SMA. Unfortunately, it comes without any communication interface in standard configuration. The price for the so called RS485 piggyback interface card is around 90 Euros. On sales [...]