EV Charge Time (AC Level 2)

How long an AC Level 2 EV charge takes: energy = capacity x (target - start), and the AC charge power is the LESSER of the wall EVSE and the vehicle's onboard charger. A 75 kWh EV from 20 to 80% (45 kWh) on an 11.5 kW EVSE with a 7.7 kW onboard charger charges at only 7.7 kW -> 6.6 hr at 88% efficiency, and the EVSE is flagged as oversized; a car with an 11.5 kW onboard charger finishes the same charge in 4.4 hr. The onboard-charger bottleneck is why a bigger EVSE often does not charge faster. Constant-power AC Level 2 model (DC fast charging tapers); the vehicle's charging curve governs.

energy = capacity x (target - start)/100; charge_power = onboard > 0 ? min(evse, onboard) : evse; time_hr = energy / (charge_power x efficiency/100).

AC Level 2 EV charge-time model (SAE J1772 onboard-charger limit; charging losses), first-principles; the vehicle's charging curve governs the actual profile.

Charge time = energy needed / charging power is first-principles; the onboard-charger limit is inherent to AC (SAE J1772) charging and the ratings come from the vehicle and EVSE.

Estimate. AHJ and licensed professional govern.

Field names used by the API: battery_capacity_kwh, start_soc_pct, target_soc_pct, evse_power_kw, onboard_charger_kw, efficiency_pct, energy_needed_kwh, charge_power_kw, time_hr

• AC power limit charge power = min(EVSE output, vehicle onboard charger); the onboard charger usually governsSAE J1772 AC charging
• Efficiency default 88% covers AC-to-DC and thermal losses; the grid draws more than the battery storescharging losses
• Constant power holds for AC Level 2; DC fast charging tapers above ~80% SOC and this over-predicts near fullscope of this tile