How to Estimate Distributed PV System Power Generation?

To estimate the power generation of a PV system, you need to know the effective sunshine hours at the installation site, the system efficiency and the installed capacity of the system.

For example, for a 1000W grid-connected PV system installed in Beijing, with 4 hours of effective sunshine and a system efficiency of about 80%, the daily generation formula is: module installed capacity x effective sunshine hours x system efficiency = 1000 x 4 x 0.8 = 3200Wh, about 3.2 kWh.