I must presume these are AiO inverters, in parallel, only providing a single phase and connected to the same battery.
Worth noting up front that PV input and AC power are handled by two completely independent devices, even if they're in the same box.
Your question begs another question... how do your specific inverters operate in parallel? Do they try to share the load equally? Do they cascade from one to the next? In most cases, it doesn't matter one bit as long as you have enough power for your loads.
In your situation, a total of 9500W is available from the three inverters. That can either go to loads or to battery charging.
Let's say you have 9000W of loads. How the output is handled is up to the inverters. They might split it all equally, or it might be cascaded, 5000W from the first unit, 4000W from the second and none from the third (most try to do it equally).
Their MPPTs will be pulling whatever they need to charge the battery and power the loads.
Assuming they share the output equally:
Inverter 1: pulling 1500W from PV, 1500W from battery for loads
Inverter 2: pulling 3000W from PV for loads
Inverter 3: pulling 3000W from PV for loads, 1500W from PV charging battery from inverter 1's 1500W load, 500W excess if needed for charging battery.
FWIW, you can accomplish the same kind of power distribution with three separate arrays in parallel to the same unit. In 100% of cases, a single South facing array will harvest more total energy on a given day (assuming clear skies and sunrise to sunset exposure). A split array sacrifices the total AND peak harvest to widen the output at a lower total peak.
You can simulate three separate arrays at:
Estimates the energy production and cost of energy of grid-connected photovoltaic (PV) energy systems throughout the world. It allows homeowners, small building owners, installers and manufacturers to easily develop estimates of the performance of potential PV installations
pvwatts.nrel.gov
You can download the hourly data and combine them in a spreadsheet. Every single time I've run the analysis, the results have been underwhelming.