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Charging & Power Deterministic Model v1.2

EV Charging Cost Calculator

Calculate precise charging costs including AC/DC efficiency losses and grid power draw.

Charging Parameters

Enter your battery specifications & tariff
kWh
e.g. 40 kWh for compact SUV, 60–80 kWh for long range
20%
80%
90%
Accounts for AC/DC conversion heat loss (Typical: 88%–92%)
₹ / kWh
Estimated Charging Cost ₹213.33 ₹8.89 per kWh added to pack
Battery Energy Added: 24.00 kWh
Grid Energy Drawn: 26.67 kWh
Energy Loss (Thermal): 2.67 kWh
SOC Delta: +60%
💡

Charging between 20% and 80% is optimal for preserving long-term lithium-ion battery health.

Mathematical Formula & Physical Model

Grid electricity draw accounts for AC-to-DC conversion losses (typically 88% to 92% efficiency) before multiplying by the unit electricity tariff.

1 Battery Energy Added (kWh) = Battery Capacity (kWh) × ((Target SOC% - Current SOC%) / 100)
2 Grid Energy Drawn (kWh) = Battery Energy Added (kWh) / (Charging Efficiency% / 100)
3 Estimated Cost = Grid Energy Drawn (kWh) × Electricity Rate (per kWh)

Worked Example

Reference Benchmark

Mid-Size Electric SUV Home Charge

Charging a 40 kWh battery from 20% to 80% SOC at a home electricity rate of ₹8.00/kWh with 90% onboard charger efficiency.

Battery Capacity 40 kWh
Starting SOC 20%
Target SOC 80%
Charging Efficiency 90%
Electricity Tariff ₹8.00 / kWh
Computed Result: ₹213.33 (26.67 kWh grid energy consumed, 24.00 kWh added to pack)

Values are calculated deterministically using the physical formula.

Frequently Asked Questions

Why does grid energy drawn exceed the battery energy added?

During EV charging, energy is lost as heat in the onboard AC/DC rectifier, cabling, and battery thermal management system. Modern Level 2 home chargers typically operate at 88% to 93% efficiency.

How do public DC fast charging costs differ from home charging?

Public DC fast chargers bypass the vehicle’s onboard AC converter to feed high-voltage direct current into the pack, but commercial operators incorporate demand surcharges, operational overheads, and higher tier tariffs.

Does charging speed impact total cost?

While ultra-fast DC charging incurs higher station service rates, slower AC charging over 8–10 hours during off-peak night hours is substantially more cost-effective.

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