I think that you made a mistake with the solar farm area comparison. 10 megawatts per square kilometer (annualized, already accounts for night time and clouds)

I think that you made a mistake with the solar farm area comparison. 10 megawatts per square kilometer (annualized, already accounts for night time and clouds) is a decent rule of thumb for solar farms. So 84 MWh/day (3.5 MW) would take 0.35 km^2 of solar farm. If solar farms were completely tiled over with 20% efficient panels achieving 28% capacity factor, 3.5 MW would occupy only 0.0625 km^2. But offshore wind still has advantages in that it doesn't occupy on-shore real estate and can supply power at night without batteries.