Question: how to calculate kwp to kwh?
Answer: To calculate your systems expected output, you multiply the peak capacity of the system (in kWp) by the energy production per peak capacity (kWh/kWp). You will get the total energy generated by a system each year. For a 2.5 kWp system in Malta, it would be 2.5 x 1,664 = 4,161 kWh per year.