I have installed my sunsynk 5kw inverter, it works nicely with the battery, but during the day it's not picking up the power from solar panels, I have tested, there is power coming from the panels, but the inverter just rejecting it

can you share your settings from the inverter please so that we can see how its set up - there isn't much information contained in the post above

Please also share your panel setup as well, including what type/model, how many, and how they are wired up. It could be that you don't meet the inverter's minimum MPPT input Voltage requirement.