This is very informative page, thank you all!
My Sunsynk 12kW inverter was installed yesterday. It seems it had used battery power down to 20% overnight (which is good!). BUT...when grid power was available, the grid power never kicked in and now the house is in the dark at 5am with batteries at 19%. So inverter turned itself off with a F56-DV Volt Low error message.
Does this mean there is something wrong with ac power coming into inverter?
Or something else?
Not sure how to attach screenshots of settings but any input would be very welcome, thank you!