Questions about DC to AC ratio and Rates for energy charges

Hello Paul.

In PV System Design. In your experience what is e good and/or correct DC to AC ratio?

In rates for energy charges. How can I do if I have two periods or tiers for saturday and only one period or tier for sunday?

Best

Dear Rei,

The optimal DC-to-AC ratio depends on the project. There are a number of good articles on the subject that you can find online, for example this one from SolarPro magazine:

SolarPro Article: "Optimal PV-to-Inverter Sizing Ratio"

Unfortunately, it is not possible to separate Saturday and Sunday. SAM makes several assumptions about days of the week:

• The first day of the year is Monday, January 1
• Weekdays are Monday through Friday
• Weekends are Saturday and Sunday

It also does not account for leap years or for daylight savings time.

Best regards,
Paul.