Battery Charging Cost Calculator

Use this handy battery charging cost calculator for estimating the expenses of charging batteries, typically for electric vehicles (EVs) or other large rechargeable battery systems.

To tool will calculate the approximate cost of charging a battery based on various factors, such as Battery capacity (in kWh), electricity rate (price per kWh), charging efficiency etc.

Battery Charging Cost Calculator

Device	Battery Capacity (kWh)	Electricity Rate ($/kWh)	Charging Efficiency	Charging Cost	Charging Time (7.2 kW charger)
Smartphone	0.015	0.13	0.80	$0.002	0.002 hours (7.5 sec)
Laptop	0.1	0.13	0.85	$0.015	0.014 hours (50 sec)
E-bike	0.5	0.13	0.90	$0.072	0.069 hours (4.1 min)
Electric Scooter	0.6	0.13	0.85	$0.092	0.083 hours (5 min)
Electric Lawnmower	2.5	0.13	0.90	$0.361	0.347 hours (20.8 min)
Nissan Leaf	40	0.13	0.90	$5.778	5.556 hours
Tesla Model 3 LR	82	0.13	0.90	$11.844	11.389 hours

Battery Charging Cost Calculation Formula

The fundamental formula for calculating battery charging cost is:

Cost = (Battery Capacity * Electricity Rate) / (Charging Efficiency)

Where:

• Battery Capacity is measured in kWh
• Electricity Rate is the cost per kWh
• Charging Efficiency is expressed as a decimal (e.g., 0.90 for 90% efficiency)

Let’s consider an electric scooter with a 0.5 kWh battery:

• Battery Capacity: 0.5 kWh
• Electricity Rate: $0.15 per kWh
• Charging Efficiency: 85% (0.85)

Cost = (0.5 kWh * $0.15/kWh) / 0.85
Cost = $0.075 / 0.85
Cost = $0.088 (rounded to nearest cent)

In this scenario, charging the scooter’s battery would cost approximately 9 cents.

How do you calculate the cost of charging a battery?

To calculate the cost of charging a battery, follow these steps:

• Determine the battery capacity in kWh
• Find your local electricity rate (often listed on your utility bill)
• Estimate the charging efficiency (if unknown, assume 85-90%)
• Apply the formula mentioned above

Let’s calculate the cost of charging a Tesla Model 3 Long Range:

Battery Capacity: 82 kWh

Electricity Rate: $0.12 per kWh (national average)

Charging Efficiency: 90% (0.90)

Cost = (82 kWh * $0.12/kWh) / 0.90
Cost = $9.84 / 0.90
Cost = $10.93

Therefore, fully charging this Tesla Model 3 from 0% to 100% would cost approximately $10.93 under these conditions.

How do you calculate battery charging time per kWh?

Calculating charging time involves considering the power output of the charger. The formula is:

Charging Time (hours) = Battery Capacity (kWh) / Charger Power Output (kW)

Let’s determine the charging time for a Nissan Leaf with a 40 kWh battery using a 7.2 kW home charger:

Charging Time = 40 kWh / 7.2 kW
Charging Time = 5.56 hours

This Nissan Leaf would take approximately 5 hours and 34 minutes to charge fully from empty.

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