Path-Q Solar

How much additional solar capacity might an EV require?

Answer

The added capacity depends on the EV's annual charging electricity use and the site's expected annual solar production per unit of capacity. Estimate charging energy from annual miles, vehicle efficiency, and charging losses, then divide by the site's modeled production rather than using a universal panel count.

Key points

  • More annual driving generally requires more electricity and therefore more solar capacity.
  • Vehicle efficiency, climate, driving conditions, and charging losses affect the estimate.
  • Charging at home is not the same as charging entirely from solar; timing affects direct use and exports.
  • The roof, inverter, service, and interconnection may limit the practical addition.

What it depends on

  • Annual mileage and vehicle efficiency
  • Charging losses and the share charged at home
  • Local solar resource and system orientation
  • Existing system capacity and expansion limits

Risks and trade-offs

  • A mileage forecast can change significantly after purchase.
  • Adding capacity to cover annual EV energy does not guarantee real-time solar charging.
  • A larger system may exceed available roof or electrical capacity.

Information you may need

  • Expected vehicle and annual mileage
  • Home-charging share and charging schedule
  • Existing or proposed solar production estimate
  • Available roof and electrical capacity

Your next step

What to do next

Calculate expected annual home-charging energy and ask for a design showing the incremental capacity, roof area, and electrical requirements.

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