Path-Q Solar
Should I plan for a second EV when choosing my solar system size?
Answer
Plan for a second EV when its purchase and charging demand are reasonably likely within the system's useful planning horizon. Otherwise, compare the cost of sizing for it now with the feasibility and cost of expanding later.
Key points
- Estimate the second vehicle's annual driving and charging energy separately from the first.
- Check whether the roof, inverter, service, and interconnection can support future expansion.
- Charging schedules may overlap, affecting peak demand even if annual energy is manageable.
- A documented future-load scenario is better than an unsupported assumption.
What it depends on
- Likelihood and timing of the second EV
- Expected annual mileage and vehicle efficiency
- Charging times and charger power
- Future expansion feasibility
- Value of additional generation
Risks and trade-offs
- Including an uncertain vehicle can increase upfront cost and excess generation.
- Excluding a likely vehicle may make later expansion more expensive or constrained.
- Two chargers may require service or load-management changes.
Information you may need
- Expected purchase timing
- Estimated annual miles for both vehicles
- Charger locations and power levels
- Available roof and electrical capacity
- Installer's expansion options
Your next step
What to do next
Request current-load, one-EV, and two-EV designs, including the cost and technical feasibility of later expansion.
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