Solar PV excess generation issue

Hi Craig,

Sorry, the variable names here are a little misleading.

The monthly "Excess generation" output variable only applies to the net metering options that calculate excess generation as the difference between the total monthly generation and total monthly load. For the net billing and buy all / sell all metering options, SAM sets excess generation to zero.

The net billing options calculate excess generation on a time step basis. The monthly "Net billing credit" output variable applies to the net billing options. The excess generation in this case is the "Electricity to grid from system" in the lifetime hourly (or subhourly) results. You can verify that by displaying that variable along with "Lifetime electricity load" and "System power generated:" You should see that To Grid = Power Generated - Load.

Some of this is explained in the "Electricity Bill Results" topic of Help (find it under "Electricity Rates and Load" in the table of contents). I will make some revisions to make this more clear.

Thanks,
Paul.