Approximate Solar PV System Capacity:

Daily Solar Insolation (KW / Sq. Mtr. / Day)

X

Rated PTC Capacity of System

=

Total KWh / Day

Eg: Each Solar Panel (210 W PTC) will produce around 1.05 KWh per day with an average insolation of 5 KWh / Sq. Mtr / Day.

Refer to the attached map for Insolation readings across India.

For an accurate calculation use this online calculator :-

http://rredc.nrel.gov/solar/calculators/PVWATTS/version1/