So I have been going round in circles with this issue from shortly after I got my Multipllus II GX 5kVa 48v unit. I connected a CT sensor to AUX1 as per the Victron instructions, set the dip switches to 1,2,3, set the CT sensor in the assistant in VE configure 3 as per my arrangement with PV on AC1 out and set it to AUX1, as how I had connected it. All was fine for the few hours before the option to download the Remote VEConfigure files had disappeared from the VRM portal. Found some info about how a firmware update was required, which I did and form that moment ESS stopped working.
After 2 days and 3 posts on this Victron Community page, @Rob Duthie came to may aid and between us, we worked out that it was the sensor was the issue. I has assumed that after the firmware update it had removed all assistants, that stopped the CT sensor form working correctly after the firmware update. I unplugged the CT sensor form the AUX1 and ESS started working again. Brilliant, I thought we knew what the issue is and I'll fix another day.
I ordered another 40A CT sensor assuming the sensor was damaged or I did something to it to prevent it from working correctly, reconnected it to AUX 1 as per the instructions, set up the current sensor in the VE Configure 3 app, uploaded the file and then restarted the system, but again ESS stops working.
Maybe I am missing something but if I have following the instructions to the word, can some one help me and shed some light on why ESS is not working when I connect the 40A Victron CT sensor to either AUX1 or AUX2? Am I doing something wrong?
I have now connected the sensor to AUX2, of which I still have no reading for the PV input as I did before the firmware update but at least ESS is working. Could I potentially have a faulty unit? 2 weeks of having this unit running and a 50% down time, I am quickly losing faith.
The reason for not not trying AUX 2 previously as first I did not know the issue was with the Multiplus II GX unit and also I had other uses for AUX2 already wired in.