EV Charge Cost at the Meter

Energy to the pack = capacity x (target - start); the meter draws more because AC Level 2 loses about 10-15% to the onboard rectifier and thermal load, so grid energy = battery energy / efficiency. A 75 kWh EV, 20 to 80% (45 kWh) at $0.15/kWh and 88% efficiency draws 51.1 kWh and costs $7.67 -- not the $6.75 the dashboard math implies -- an effective $0.170/kWh, and about $0.049/mi at 3.5 mi/kWh. A public DC fast charger at $0.45/kWh runs nearly 3x that. Ignores tiered, time-of-use, and demand pricing; the local tariff governs.

energy_to_battery = capacity x (target - start)/100; grid_energy = energy_to_battery / (efficiency/100); cost = grid_energy x rate; cost_per_stored_kwh = rate / (efficiency/100); cost_per_mile = miles_per_kwh > 0 ? cost / (energy_to_battery x miles_per_kwh) : null.

EV charge-cost-at-the-meter model (energy metered = energy stored / charging efficiency), first-principles; the local tariff and the vehicle's charging behavior govern the actual bill.

Cost = metered energy x rate is first-principles; the efficiency haircut (grid draws more than the pack stores) is inherent to AC charging losses, and the rate comes from the local tariff.

Estimate. AHJ and licensed professional govern.

Field names used by the API: battery_capacity_kwh, start_soc_pct, target_soc_pct, electricity_rate, efficiency_pct, miles_per_kwh, energy_to_battery_kwh, grid_energy_kwh, cost, cost_per_stored_kwh, cost_per_mile

• Metered energy grid draws more than the battery stores: grid_energy = battery_energy / efficiency (default 88%)AC charging losses
• Flat rate constant $/kWh; ignores tiered, time-of-use, and demand pricingscope of this tile
• Currency rate, cost, cost per kWh, and cost per mile carried as dimensionless; currency and mileage are not physical dimensionscost-tile convention