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Solar panel (watt) × average hours of sunlight × 75% = daily watt hour

Yes, it is possible. The general formula for standard test conditions (irradiance of 1000 W/m² and a temperature of 25°C) is;

P=A×G×η

Where:

P = the power output (in watts)

A = the area of the solar panels (in square meters),

G = the solar irradiance (in watts per square meter), and

η = the efficiency of the solar panels (typically ranging from 0 to 1, ideally 0.75).

Hope this helps,

Kind regards,

Kedar