Battery & energy
EV Home Charging Planner
Daily driving energy comes from distance and vehicle efficiency. The planner compares that energy with the entered overnight window and charger power without sizing a circuit. The method follows the electrical relationships and NIST unit references documented on the Electrical Formulas and Sources pages.
Plan EV home charging from daily distance, vehicle efficiency, overnight hours, charger power, charging losses, battery state of charge, and electricity rate.
Calculated result
EV home charging plan
Calculating…
Calculated locally in your browser
Planning math only. Verify equipment specifications and installation requirements separately.
What this calculator returns
The plain-language result answers whether the entered charger can replace a normal driving day overnight. Scenario cards compare 1.44, 3.84, 7.68, and 11.52 kW without sizing any circuit.
Formula and variables
The calculation runs entirely in your browser. Static formulas, definitions, examples, and tables remain readable without JavaScript.
Daily battery kWh = distance ÷ efficiency for distance-per-kWh units, or distance × energy-per-distance for consumption units. Minimum wall power = daily battery kWh ÷ (overnight hours × charging efficiency).
- d
- User-entered daily driving distance in miles or kilometers.
- e
- Vehicle energy efficiency in the selected distance or consumption unit.
- Eday
- Battery energy needed to replace the modeled daily driving.
- ηcharge
- User-entered wall-to-battery charging efficiency.
- Pwall
- Charger wall power or minimum average wall power for the entered overnight window.
Range restored per hour uses your entered vehicle efficiency. Monthly grid energy normalizes weekly driving energy by 52 ÷ 12 and divides by charging efficiency.
Worked example
| Input | Value |
|---|---|
| Distance unit | Miles |
| Typical daily driving | 40 mi / km |
| Vehicle efficiency unit | mi/kWh |
| Vehicle efficiency | 3.5 |
Driving 40 miles/day at 3.5 mi/kWh uses about 11.43 kWh of battery energy. With 10 hours and 90% charging efficiency, about 1.27 kW average wall power replaces it overnight.
Reference table
| Wall power | Battery energy/hour | Range/hour at 3.5 mi/kWh | Typical scenario label |
|---|---|---|---|
| 1.44 kW | 1.30 kWh | 4.5 miles | Level 1 |
| 3.84 kW | 3.46 kWh | 12.1 miles | Lower-power Level 2 |
| 7.68 kW | 6.91 kWh | 24.2 miles | Higher-power Level 2 |
| 11.52 kW | 10.37 kWh | 36.3 miles | High-power Level 2 |
Frequently asked questions
Is Level 1 enough for my daily driving?
Compare the 1.44 kW scenario with your entered overnight window. If its calculated time is within that window, it replaces the modeled daily energy under your assumptions.
How is this different from the EV Charging Cost Calculator?
This planner starts with daily driving to find needed home charging power. The cost calculator starts with a battery SOC change for one charging session.
Does this tell me what breaker or wiring I need?
No. It intentionally reports only energy and charging power; an appropriate professional must verify installation requirements.
Assumptions and limitations
- No breaker, conductor, branch-circuit, electrical-panel, service-capacity, connector, or code-compliance calculation.
- Vehicle limits, charger limits, taper, battery conditioning, temperature, scheduled charging, and auxiliary loads can change actual power and time.
- Efficiency and driving pattern are user assumptions; use vehicle trip data when available.
- Installation requirements must be verified by an appropriate professional.
Method and sources
Review the electrical formulas, calculation methodology, and standards status for the references most relevant to this calculation. The broader technical sources index records source scope and provenance. Content release .