I have a MultiPlus-II 5000 GX, which came with a two-wire temperature sensor.
I have no need of the sensor to monitor the battery since my battery has inbuilt monitoring (Pylontech US5000), so I've employed it to measure the temperature of the free air around the unit. This seems to work well. It shows up on VRM as "battery temperature" but the unit itself is quite aware that it should ignore the sensor input, and refer instead to the BMS-reported data.
I drive a second (external) fan using the programmable relay base on the Multiplus-II's fan state. This also works great.
I thought I'd extend it to turn on the fan in case the free air temperature rose. Hence exploring the programmable relay temperature sensor input.
When the assistant's "input signal (aux 1, aux 2 or temperature sensor input)" option is selected, it will later offer a panel titled "Drive based on input signal", with detail then when "Aux 1/Aux 2/Temperature sensor input" is "open/closed" for "(some number)" it will drive the relay.
Obviously I want "Temperature sensor input".
But what does "open/closed" mean in this context?
And what does the number mean?
I wonder if it is a mis-translation? Could the open/closed be intended to mean "above/below", and then the number would be the temperature in ºC? But that seems a bit of a leap in the dark.
Has anyone any experience or idea?
My other idea is to write a small Node-RED flow that monitors the temperature input, and drives the relay on the Smart Solar instead. Might switch over to that if I can't find out how the assistant works.