[flavius29663]

The map shows solar resource, irrespective of the technology you're using. For example, you could be using heat collectors that would capture closer to 100%. To keep things simple, for back of the envelope calculations, you can imagine 1kW per square meter. Subtract cloud coverage, night hours and then multiply with 0.2 for PV panels efficiency.

If you want 11kWh/day, you need: (5.7 * 0.2) * Y = 11, so Y = 10 square meters. You can double check this: 10 sqm should have about 10KW of solar potential energy, but with PV efficiency you're getting about 2KW, so to reach 11kWh, you need 5 good hours of sunshine on average.