I have finished the installation of my Multiplus II 47/5000/70 and the system is up and running. the configuration is as follows:-
1/ Multiplus II GX
2/ External Current Transformer
3/ 5 x Pylontech US3000
4/ Type A BMS cable (CAN bus set to 512kbps)
5/ No loads connected AC1 or AC2 out (currently)
6/ Solax 3700e inverter with 16 panels
7/ Battereis to be charged overnight on cheap electricity
When I switch the inverter on after its self test it goes into ESS Passthru. Not being familiar with this inverter I have probably missed a setting somewhere
I have carefully checked the CT and the arrow is pointing towards the Multiplus and I believe that the bare ends are correct way round. Everything appears correct and the batteries are correctly detected and showing 100%
I hadn’t actually set the "Grid Meter"explicitly so it had defaulted to External Meter. Having read the help for this setting I now realise that this should be set to Inverrter/Charger. I have now changed this to Inverter/Charger and it is now discarging the battery, I have set an ESS charge schedule to charge the batteries overnight with cheap electricity and hopefully in the morning I will have battereis charged to 90%.
The charging side from the AC couplesd PV is working correctly, currently charging at 2KW at 10a.m. and is at 73%. Out most of the day so will have another look at the charging schedule / parameters later.
New inverter has sufficient output to run the ASHP off the batteries whereas the SOLAX only had an output of 2.5Kw supplemented by the grid.
I set a schedule for charging and the display went from discharging to charging but no actual charging took place. At the end of the period it went back discharging.
It has to be a setting as the system has ben charging and discharging correctly. The question is which one??
Having gone through the ESS settings it transpires that the setting that was limiting the charging was “Limit Inverter Power” was set to on and the limit was set to 1000. I have now turned off the power limiting and a short charging test shows that the system is now charging correctly. I may limit the inverter charging limit if noise is a problem in the early hours of the morning.
