The RS485 communication module.

Compatible with SMA Transformerless inverters SB 3000/4000/5000TL-20, SB xxxxTL-21, STP 15000TL-10, STP- 17000TL-10,  STP 20000/25000TL-30  (excluding the ST-20000TLEE-10)

Please note the XXXXTL-20 range of SMA inverters are not compatible with this interface