I got a Solax SK-SU3700 but no external temperature sensor.
Can you please provide the pinout of the RJ45 plug and the value of the sensor
I find the answer on this video.
NTC is connected on pins 1 & 3 of the RJ45 and the value is 76.1 kohm
sorry to bring up this old topic… I have the same inverter, were you ever able to get automatic updating for agile pricing etc… eg, homeassistant to change the battery to force charge at certain times?