Inverter work only in full sun. In cloudy days mppt tracker sits at 60V and doesn't make any electricity.
This unit is a clone of voltronic inverter. Voltronic fixed the above issue with firmware update. This company however doesn't have any support so no new firmware available. There's only few salesman who doesn't even try to help with the issue. DON'T BUY ANYTHING FROM THIS COMPANY. Without a support the items are worth nothing.