Hi,
I am observing since some weeks a strange behaviour which I dont understand nor know how to debug it. Everything is configured as described in the manual and works in general.
However whenever I have a short lasting load like only 5 minutes water boiling or a longer load e.g. from the dish water the setup is not able to keep the grid point though there is still plenty of battery capacity. Instead of getting the whole setup spmehow in balance either the system draws too much from the battery and feeds it into the grid or the system draws too few from the battery. So the load on the smart meter constantly fluctuates between e.g. -500-2000W or +500-2000W but never keeps the set grid point (30W) over longer time. When I restart the VenusOS the grid point is stable however some hours later again when a higher load kicks in the systen is again out of balance.
I have no idea at all how to debug it. I already tried to update the firmware of multiplus and VenusOS but without success.
This is my setup:
- Multiplus II with Venus OS large (on raspi4) and 2 pylontech 5000C connect via CAN bus
- External smart meter emulated via GitHub - mr-manuel/venus-os_dbus-mqtt-grid: This Venus OS driver gets the data from MQTT and displays it as grid, genset or ac load meter.
Any help is appreciated, thanks so much.