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Optimising Home EV Charging: Why Isn’t My Charger Charging to its Full Capacity?

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Electric vehicle charging plays a pivotal role in maximising the utility of your home charging setup. However, discrepancies between the displayed charging rate on your EV’s monitor and the power supplied by your charger can lead to confusion and concern. Let’s delve into the intricacies of EV charging efficiency and explore why your home charger may not be delivering the expected charging rate to your EV.

Understanding Charging Discrepancies

Have you ever noticed that your EV’s monitor displays a lower charging rate than what your home charger indicates? This phenomenon is common among EV owners, including those driving models like the BYD Dolphin. Despite a wall charger showing a robust 6.9 kW charging rate, some BYD owners report only receiving a 6.4 kW charging rate on their vehicle’s display. Even when aiming for the touted 7 kW charging rate, many drivers find themselves falling short, achieving rates closer to 6.6 kW.

Factors Affecting Charging Efficiency

Several factors contribute to the disparity between the expected and actual charging rates:

1. Conversion Losses: The process of converting AC from the grid to DC to charge the battery incurs energy losses in the form of heat, impacting overall efficiency.

2. Charging Speed: Fast chargers, particularly DC fast chargers, generate higher heat levels during rapid charging, leading to decreased efficiency compared to standard Level 2 chargers.

3. Battery State and Temperature: Extreme temperatures, both hot and cold, can affect charging efficiency, especially concerning the battery’s state of charge and health.

Calculating Charging Efficiency

Charging efficiency is a crucial metric determining how effectively electrical energy from the grid is transformed into stored energy in the EV’s battery. Typically, Level 2 charging, prevalent in home and public charging stations, boasts an efficiency range of 85% to 95%. This means that out of every 100 kWh drawn from the grid, 85 to 95 kWh are effectively stored in the vehicle’s battery. Although DC fast charging may exhibit slightly lower efficiency rates, ongoing technological advancements aim to enhance overall efficiency levels.

Consulting Manufacturer Guidelines

For precise efficiency ratings and guidelines tailored to your EV model and charging equipment, it’s essential to refer to the manufacturer’s specifications. By consulting the EV manufacturer’s data, you can gain valuable insights into optimal charging practices and ensure an efficient and reliable charging experience for your electric vehicle.

In conclusion, while discrepancies in charging rates may raise concerns, understanding the intricacies of EV charging efficiency empowers you to optimise your home charging setup effectively. By staying informed and adhering to manufacturer guidelines, you can maximise the efficiency of your EV charging system and enjoy seamless charging experiences.

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