Good Day Armand007.
I have just had a Deye 8KW inverter with a pair of US3000C batteries installed a week ago.
My batteries seem to ignore the evening load and diverts to the grid when the sun goes down.
My installer informed me today that there seems to be a software issue with the US3000C batteries and you need to have the software down graded to have this issue resolved.
Float Voltage must be 51V
Absorption Voltage must be 52V.
Good Luck