The node red way to get data from EnergyManager is here:SMA Energy Meter in Home Assistant - #73 by chris_ka
but I would recommend the newly available Add-In for Homemanager doing this perfectly: see here: SMA Energy Meter in Home Assistant - #120 by kellerza
The way to pulling data from the inverter via homeassistant is here: MODBUS data from SMA Inverter - #22 by chris_ka
and here with node red: Tutorial to read Modbus Registers in NodeRed and sent to MQTT