Path-Q Solar
How much additional solar capacity might an EV require for my household?
Answer
The added capacity depends mainly on annual driving distance, vehicle efficiency, charging losses, and how much charging is supplied by the home. Estimate annual charging energy first, then translate it into solar production using the site's expected output; the result is site-specific rather than a fixed panel count.
Key points
- Use actual or expected miles driven and the vehicle's energy consumption.
- Include charging losses and distinguish home charging from workplace, public, or renewable charging.
- Compare annual EV energy with the proposed system's production and seasonal output.
- Charging during solar-production hours can improve direct use without changing annual capacity.
What it depends on
- Annual driving distance and vehicle efficiency
- Share of charging performed at home
- Charging losses, schedule, and managed-charging capability
- Solar production, roof capacity, and bill treatment of exports
Risks and trade-offs
- Sizing from the vehicle's battery capacity rather than actual annual energy use can be misleading.
- An EV may increase winter or nighttime grid purchases even when annual solar production appears sufficient.
- A larger system may have limited value if much of its output is exported under unfavorable terms.
Information you may need
- Vehicle model or expected efficiency
- Annual mileage and home-charging share
- Charging schedule and charger power
- Proposed solar production and current bill structure
Your next step
What to do next
Provide the installer with your mileage and charging assumptions and request current-use and EV-inclusive system-size scenarios.
Path-Q
Find the right next step
Answer a few questions and we’ll narrow your options.
Loading…
SQ00247