Path-Q Solar
How much additional solar capacity might an electric vehicle require?
Answer
The additional capacity depends on annual driving distance, vehicle efficiency, charging losses, and how much charging electricity comes from the grid rather than solar. Estimate the EV's annual charging energy first, then compare it with the site's expected annual production per unit of solar capacity; the result is site-specific rather than a fixed panel count.
Key points
- Use actual or expected miles, vehicle efficiency, and charging losses rather than the battery's capacity alone.
- A second EV or higher mileage can materially increase the requirement.
- Solar production varies with roof orientation, shading, climate, and system design.
- Charging directly during solar-production hours can reduce the amount of additional annual production needed to achieve a desired financial result.
What it depends on
- Annual driving distance and vehicle efficiency
- Charging location, schedule, and equipment losses
- Existing household electricity use
- Expected solar production at the proposed site
Risks and trade-offs
- An annual-energy estimate may not cover charging at the times the vehicle is used.
- Oversizing solar for uncertain future driving can reduce flexibility if driving habits change.
- A limited electrical service or charger capacity may constrain charging even when enough solar energy is produced.
Information you may need
- Expected annual mileage and vehicle efficiency
- Charging schedule and charger type
- Current electricity use and bills
- A site-specific solar production estimate
Your next step
What to do next
Calculate annual EV charging energy and ask for a solar design that compares current load, EV load, and charging-time scenarios.
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