That peak capacity seems a bit high, and just isn't very helpful if there's any volume of solar on the grid. Some back of the envelope calculations for mean output:

Total area: ~5000m²

Annual mean insolation: ~100W/m²

Solar panel efficiency: 20%

Annual mean power output = 5000*100*0.2 = 100kW

And on top of that, you still need either energy storage or rapid on-demand generation (e.g. gas fired) to get you through the Dunkelflauten.