change priority SBU to SUB

[zulmbbs]

hi,good day,is there any way so that i can change the output source priority, from sbu to sub vise versa
i need to change to sub in the day time and change back to sbu after sun hour so that i can export my extra pv after battery is fully charged
for now i have to switch the priority manually, is there any way i can automate this
thank you for the respone