Hi,
I can't reconcile the results when switching between the two cumulative sub-hourly options. I set up a test file with one period, the same buy and sell rates, and a system that covers about 80% of load with a mix of surplus and consumption months.
When I run the model, the NPV of the system is identical in four of the five metering options, but the cumulative hourly (subhourly) excess credited to next month bill in $ at sell rates is way different ($704 for the 4 options, -$3,071 for the last). I can understand a small amount of difference if the buy and sell rates vary based on seasonal changes, but nothing of this magnitude. If I understand the help file, the only difference should be whether the credit is applied to this month or the next.
Thanks,
Kevin