I have an MP2GX, after the consumer unit, using AC in only. There is no solar PV, and it is simply being used for ESS battery storage and self consumption (charging from mains overnight):
- The ET112 is connected to the USB socket on the MP2GX but it is not detected in meters.
- The green power light on the ET112 is on but it is not flashing (indicating no comms).
- The USB plug initially flashes red and a couple of green flashes and then stays solid red.
- There are no extensions to the cable, it is the standard Victron cable
- I have tried connecting with and without ferrules and have tried shortening the length of he cable and neither has made a difference i.e. I am sure the connection is good, with orange, yellow, black to terminals 4/5/6 respectively.
- I have also tried connecting the ET112 to the laptop and using the CG software but the ET112 is not detected there either.
- I have noticed that the USB plug on the cable gets very hot (not sure if this is normal or not for this cable).
My working assumption for now is that I either have a faulty meter or a faulty cable and will need to investigate further. What I want to understand is the impact this might have on ESS functionality if no meter is detected within the MP2GX. At the moment my batteries will charge but they will not discharge. From the ESS manual (4.3.2), it states that I must have an external meter to avoid having to connect loads to AC-out (I am just using the AC-in bidirectional). All other ESS and Pylontech settings have been entered correctly in VEConfigure and remote config of MP2GX.
Questions:
- My assumption is that the batteries will not discharge because the ET112 is not detected and there are no loads are present on the AC outs - is this assumption correct?
- The manual is not clear whether the required external "meter" to discharge via AC-in can just be a CT clamp, rather than the ET112. Can I use a CT with ESS and then charge/discharge with AC-in only?
Sorry for long post but I am just looking for options to track back the problem i.e. is the fact the meter is not found the likely reason why the batteries would not discharge and, if so, I might first try a CT (cheapest if viable), then try a new USB to RS485 cable, then try a new ET112 etc. Thanks in advance for any help.