How Much Does It Cost To Charge An Electric Car

How Much Does It Cost to Charge an Electric Car? A Detailed Breakdown for UK Drivers

Electric vehicles (EVs) are becoming increasingly popular in the UK, and understanding the different types of chargers, their charging rate and electricity costs is essential for efficient and cost-effective charging. This article provides an overview of EV charger rates, focusing on two types of chargers: 2.4kW 10amp 3-pin portable chargers and 32amp single-phase charging cables. We also discuss charging times and costs for electric cars with 20kWh, 40kWh, 60kWh, and 100kWh batteries.

Types of EV Chargers

1. 2.4kW 10amp 3-pin Portable Chargers

   • Power Output: 2.4kW
   • Current: 10 amps
   • Connector: Standard 3-pin plug

2. 32amp Single-Phase Charging Cables

   • Power Output: 7.4kW
   • Current: 32 amps
   • Connector: Type 2

Charging Times, Costs and Rates

To understand the efficiency of each charging type, let's analyse the charging times, expected mileage over an 8-hour charge period, and costs for electric cars with different battery capacities.

Charging Over 8 Hours

Charging to Full Capacity

Assumptions:

• The average energy consumption is 0.3 kWh per mile. The average electric car consumes 34.6 kWh per 100 miles (kWh/100 miles), which translates to 0.346 kWh per mile. This means that, on average, electric cars use 34.6 kWh to cover a distance of 100 miles (or 160 km, since 1 mile is approximately 1.6 km) and 0.346 kWh to travel 1 mile (1.6 km).
• The average electricity price in the UK as of June 2024 is £0.245 per kWh, based on standard electricity tariffs.

Cost Analysis Breakdown

• 2.4kW 10amp 3-pin Portable Charger: Slowest option, with the highest per mile cost. Typically used in emergency situations or where no other charging infrastructure is available and is compliant with UK laws and regulations.
• 32amp Single-Phase Charger: Faster and more efficient, with the lowest per mile cost. Suitable for home use where higher power output can be supported.

Charging Caveats

1. Power Supply Availability: The actual charging rate can be limited by the total power supply available at the charging location. For instance, older homes may not support the high power draw of a 32amp charger.
2. Supply and Demand: The assigned power supply at source may not always be achievable based on overall supply and demand, especially during peak usage times.
3. Climatic Conditions: Cold weather can significantly affect battery efficiency and charging times. It may take longer to charge in cold conditions as the battery management system may need to preheat the battery. 

Conclusion

Selecting the right EV charger depends on various factors including the vehicle's battery capacity, the available power supply, and the desired charging speed. By understanding these elements, EV owners can optimise their charging routines for both cost and convenience.

Formulas for Calculating Charging Costs

1. Cost per Full Charge:

   Cost per Full Charge=Battery Capacity (kWh)×Electricity Price (£/kWh)

2. Cost to Charge Over a Defined Time Period:

   Cost to Charge=Charging Rate (kW)×Charging Time (hours)×Electricity Price (£/kWh)

This article provides readers with detailed information on the costs and charging times associated with different types of EV chargers, specifically 2.4kW 10amp 3-pin portable chargers and 32amp single-phase charging cables. By understanding the efficiency, cost per full charge, and charging durations for various battery capacities, readers can make informed decisions about which charging option best suits their needs and budget. Whether for home use or on-the-go charging, this guide helps EV owners choose the most cost-effective and convenient charging solution.