I have a brand new installation of 3x Quattro 15000/200-2x100. They are connected to Pylontech using the GX device CAN. I’m using ESS Mode 3, and sending set points using MODBUS/TCP to the GX Device.
Everything works well in my code - I have a complete log of the set points which are sent every few seconds. I also read the MODBUS registers back to make sure they worked - it takes 2-3 seconds before the change value takes affect, but then it confirms OK.
As per the Manual I'm settings registers 37-41.
The general problem is simply that the Quattros are not doing as they are told. I'm getting strange results - such as 2 out of 3 phases all charging nicely and the third doing nothing. Also, when trying to run the inverter and discharge the battery (by setting grid set point to zero) - it just ignores me and does nothing.
On the GX touch screen, everything seems fine - battery and units are happy.
It keeps going into DISCHARGING Mode (Rather than External Control) on the main touch status screen. It then discharges at 150w into the battery. However when I go into the GX Menu the status clearly says "EXT CONTROL"
I just tried a forced charge with a high set point - phases L2 and L3 did it, L1 sat dormant. Then I just tried a forced discharge with a '30' set point on each, and only L3 fired up, the other two stayed Dormant.
Then a forced charge again - all set points high... and only L3 charging again.
I've changed out all the data cables between the GX and the units. That made no difference.
Randomly one inverter fired up, immediately went to OVERLOAD + LOW BATTERY and reported a DC RIPPLE.
I'm really stuck! Is there any way to see a log of what the Quattros are doing, rather than them just ignoring me and making up their own minds?
Battery SOC is OK, and I've checked loads of MODBUS parameters:
Allowed To Charge=True
Allowed To DisCharge=True
Max Charge Current=880 Amps
Meter Grid to Load=6.13 kWh
Meter Grid to Battery=0.86 kWh
Meter Battery to Load=0.07 kWh
VE.Bus STATE=252
VE.Bus ERROR=0
VE.Bus Low Battery Alarm=0
VE.Bus Low Battery L1 Alarm=0
VE.Bus Low Battery L1 Alarm=0
VE.Bus Low Battery L1 Alarm=0
VE.Bus BMS Error=0
Battery Alarm=0
Battery State=0
Battery Error Code=0
Battery Count=0
Battery Modules Blocking CHARGE=0
Battery Modules Blocking DISCHARGE=0
ESS BatteryLife State=2
ESS Min SOC=10
ESS Mode=3
ESS Max SOC=20
I just completely re-applied ALL Settings to the three units, including assistants, and reset them all. Right now - I'm getting the same, only L3 doing as it's told, the other 2 units just completely ignoring me.
