Energy charges and time of use

Hi SAM,
Currently we would like to model the energy charges for Vietnam's Commercial&Industrial rates as below:
Normal: 2442VND/kWh - apply to Mon-Sat (4-9.30am, 11.30am-5pm, 8pm-10pm), Sun (4am-10pm)
On peak: 4251VND/kWh - apply to Mon-Sat (9.30am-11.30am, 5pm-8pm), no on peak for Sunday
Off peak: 1361VND/kWh - apply to all day of the week (10om-4am)

As you can see, our rate is different for Saturday and Sunday, therefore, the "weekend" option on SAM would not allow me to customer the rates according to the Saturday and Sunday's schedule. Is there a way to address this?

Hi Linh Nguyen,

SAM makes several simplifying assumptions for electricity bill and other time dependent calculations:

• January 1 is a Monday
• Weekends are Saturday and Sunday
• Leap days (February 29) are omitted
• No time change for daylight savings

These conventions are described in the "Sun and Time Convention" Help topic:

samrepo.nrelcloud.org/help/weather_time_convention.htm

If you are using the Net Billing, Net Billing with Carryover to Next Month, or the Buy All / Sell All metering and billing option, you can use time series (hourly or subhourly) buy or sell rates instead of the rates defined by the energy rate table and weekday/weekend schedule matrix. That would require that you create the time series data outside of SAM.

Best regards,
Paul.

Thanks Paul for the quick reply.

Then probably I can only import the electricity rates in this case through the second method (Buy All/Sell All). Will try this and see if that works.