2020 CEC Solar Efficiency Standards
California PV System Size Calculator

Calculate PV Solar System Sizing for California
New Dwelling Energy Compliance

Quickly estimate size & browse solar power systems for new dwelling energy efficiency requirements by climate zone (includes battery storage option).

  • Select appropriate climate zone (unsure? check zip code )
  • Enter total square footage of conditioned floor area
  • Enter number of units for new dwelling (ex: “1”=single family home, “2”=duplex, etc)
  • Results are auto-calculated with compatible systems ready to view
California Mandate Climate Zone Map
Click on the map to enlarge.

Energy efficiency standards go into effect in California (CA) on January 1, 2020 by the California Energy Commission (CEC) & enforced by the California Building Standards Commission (CBSC) - read new CA solar efficiency standards.

Below, learn how you can actually profit from California's solar mandate!

Wholesale Solar California New Home Construction Calculator

This calculator provides a basic estimate for research and initial planning purposes only.
Select Climate Zone
CFA Formula
Dwelling Units Forumula
Enter Floor Area (sq.ft.)
Enter Number of Units
Minimum System Size:
System Size:
Minimum System Size With Storage:
System Size with Storage:

ATTN: Contractors, Roofers, Electricians, Builders, & Developers

Sign Up Below & See How You Can Profit from Mandated Solar in California

Yes! Show me how my business can profit from California’s Solar Energy Requirements
& send me a copy of my solar (pv) system sizing results above now:

Brent from Wholesale Solar

Questions? Chat with us!

Brent and his family live on a grid-tied ranch in California, powered by a 5 kW solar system he installed himself. Brent and the rest of the Wholesale Solar team are here to answer any questions you have about designing a system that will fit your needs. Give us a call—we’re here to help.