How many solar panels are needed?

“If you use a 1.5 ton AC (1800W) for 8 hours (4 hours in day and 4 hours in night) then your total energy needs = 1800W*8h = 14.4KWh. If we suppose solar is available for 8 hours in a day and the efficiency of your inverter is 80%, then your required solar power = 14.4KWh/0.8*8 = 2.25KW”