You can connect two PV arrays in parallel and feed a single inverter or SCC if the arrays have same voltage (number of panels in series.)
This can be beneficial if the arrays are oriented differently, so their peak production is at different times of day; they will share use of lower wattage electronics.
If your device has multiple MPPT inputs, different voltage arrays could go to that.
Have to look at PV current specs of it.
4.5kW + 3kW = 7.5 kW. If your hybrid is rated 5kW maximum AC output or maximum charge power, then combining the two arrays might exceed it's capability. Usually that is allowed, but the extra available power in middle of the day would be wasted. If the two arrays are at different angles so peak production (area present to sun) is about 5kW, then it could be a good fit. Otherwise, using an additional inverter might be best to capture all the power.
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"Inverter has 2 MPPT PV inputs that allow you to have solar panels in 2 different orientations"
"Inverter do have 2500W backup power capability"
Don't know about your market, but here in the US we have some models such as Sol Ark which have their own wattage rating and can manage additional grid-tie inverters connected to them. On-grid the extra power is passed through a relay. Off-grid, the inverter can vary frequency to adjust power output of the grid-tie inverters.
But you're planning on a more modest 2500W battery backup; if that is sufficient then using a separate inverter would be the simple way to have more total grid-tie PV.