Path-Q Solar
Does charging an EV mostly overnight reduce the savings I can get from rooftop solar?
Answer
It can reduce direct solar savings because overnight charging occurs when the array is not producing, but the effect depends on how exported solar is credited, the applicable rates, and whether charging can be shifted to daytime. Annual savings may still be meaningful, but they should be modeled using the actual charging schedule and bill structure.
Key points
- Daytime charging or scheduled charging can increase direct use of solar generation.
- A home battery or other load-shifting strategy may change timing but adds cost and losses.
- The value of exported generation determines how much overnight charging changes total bill savings.
- Compare unmanaged overnight charging with realistic managed-charging scenarios.
What it depends on
- EV charging times and flexibility
- Household solar production profile
- Electricity rates, time-based pricing, and export credits
- Battery availability and charging-control capability
Risks and trade-offs
- Shifting charging to daytime may conflict with driving schedules or require additional equipment.
- A battery can improve timing but may not be economical solely for EV charging.
- Savings projections can be overstated if they assume all solar production offsets high-value consumption.
Information you may need
- Typical charging hours and home-charging energy
- Solar production by time of day
- Applicable rate and export-credit terms
- Whether smart charging or storage is feasible
Your next step
What to do next
Compare bill simulations for actual overnight charging, feasible daytime charging, and any storage option using current rate and export terms.
Path-Q
Find the right next step
Answer a few questions and we’ll narrow your options.
Loading…
SQ00248