In the field of converting the Dacia Logan II into an electric vehicle, the On-Board Charger (OBC) is a crucial yet often overlooked component. A high-power on-board charger can significantly reduce charging time, making your converted electric Logan II more practical for daily use and long-distance travel. But with so many options on the market, how do you choose? This guide will take you through the key factors to consider when selecting a high-power on-board charger for your Dacia Logan II electric conversion.
The Dacia Logan II is a popular choice for electric conversion due to its lightweight design and spacious interior. When paired with a high-power OBC, it becomes a practical and economical EV solution.
Understanding the Role of a High-Power On-Board Charger
The on-board charger is responsible for converting alternating current (AC) from charging stations or household sockets into direct current (DC) that can charge the vehicle's high-voltage battery pack. A high-power OBC (typically rated at 6.6 kW or higher) can deliver more energy to the battery in less time compared to a low-power charger. For the Dacia Logan II, which aims to be practical and economical, a high-power OBC can drastically reduce charging time, fundamentally changing its usability.
Let's assume your converted Logan II is equipped with a 30 kWh battery pack. A 3.3 kW charger would take approximately 8-10 hours to fully charge it, while a 6.6 kW charger could accomplish the same task in 4-5 hours. If you opt for an even more powerful 11 kW charger, the charging time could be reduced to 2-3 hours (depending on the battery's state of charge). This difference will have a significant impact on your daily driving habits.
Key Selection Factors
1. Power Rating
The power rating of an on-board charger, measured in kilowatts (kW), is the most important consideration as it determines the battery's charging speed. For the Dacia Logan II, which typically has a converted battery capacity ranging between 20-40 kWh, a 6.6 kW charger is a good starting point that balances charging speed and cost. If you frequently take long trips or have installed a larger battery pack (30 kWh or more), an 11 kW or 22 kW charger would be a better choice as it can more efficiently meet higher energy demands.
Charging speed is also limited by the capacity of the charging station and the battery's ability to accept charge. Ensure that the charger's power rating matches the charging infrastructure you plan to use. For example, a 22 kW charger can only charge at full speed when connected to a three-phase AC charging station; if plugged into a standard household socket, the charging speed will be much slower.
2. Compatibility with Battery Voltage
The on-board charger must be compatible with the voltage of your Dacia Logan II battery pack. Most EV conversions (including the Logan II) use battery packs with voltage ranges between 144V and 400V (common conversion range in 2025). The charger you select must be able to operate within this voltage range. For example, if your battery pack operates at 300V, the charger must be capable of outputting a DC voltage that matches or is compatible with this level.
Check the charger specifications for input voltage (AC) and output voltage (DC). The input voltage should be compatible with your local power grid (e.g., 230V single-phase or 400V three-phase in Europe). The output voltage should align with your battery pack's nominal voltage to ensure efficient and safe charging.
3. Size and Installation Space
The Dacia Logan II's engine compartment is compact, and after installing the motor, battery pack, and other components, there is limited remaining space. High-power on-board chargers are generally larger than their lower-power counterparts, so you need to carefully measure the available space.
Look for chargers with a compact design. Some manufacturers offer slim, lightweight high-power OBCs specifically for conversion applications. You may need to install the charger in the engine compartment, under the rear seat, or in the trunk. Be sure to allow sufficient space for proper ventilation, as the charger generates heat during operation.
4. Cooling System
High-power on-board chargers generate more heat than lower-power models. An efficient cooling system is essential to ensure the charger operates properly and extends its lifespan. There are two main types of cooling systems: air-cooled and liquid-cooled.
- Air-cooled chargers: Simpler in construction and more affordable, relying on fans for heat dissipation. They perform well in temperate climates but may be less effective in hot environments.
- Liquid-cooled chargers: More efficient at cooling, suitable for hot regions or very high-power chargers (11 kW and above). However, their installation is more complex and requires integration with the vehicle's cooling system.
For the Dacia Logan II, if you choose a 6.6 kW or 11 kW charger and live in a temperate climate, an air-cooled charger may suffice. If you opt for a 22 kW charger or live in a hot region, a liquid-cooled model is the better choice.
5. Safety Features
When dealing with high-voltage components, safety is always paramount. A high-power on-board charger should include a range of safety features, such as:
- Overcurrent protection
- Overvoltage protection
- Undervoltage protection
- Short circuit protection
- Overheating protection
These features can prevent damage to the charger, battery pack, and other components in the event of a fault.
Additionally, choose a charger that complies with international safety standards (such as IEC 61851 for conductive charging systems of electric vehicles) and carries certifications from authoritative bodies. This ensures the charger has undergone rigorous testing and meets stringent safety standards.
6. Communication Protocol
Modern on-board chargers use communication protocols to interact with the Battery Management System (BMS) and charging stations. The BMS monitors parameters like the battery's state of charge, temperature, etc., and communicates with the charger to adjust charging current and voltage.
Common communication protocols include CAN bus, which is widely used in automotive applications. Ensure that the charger you choose is compatible with the BMS of your Dacia Logan II conversion project. Lack of compatibility can lead to inefficient charging, overcharging, or even battery damage.
Charging Time Comparison
| Battery Capacity | 3.3 kW Charger | 6.6 kW Charger | 11 kW Charger |
|---|---|---|---|
| 20 kWh | 6-7 hours | 3-3.5 hours | 1.8-2 hours |
| 30 kWh | 8-10 hours | 4-5 hours | 2.5-3 hours |
| 40 kWh | 11-13 hours | 5.5-6.5 hours | 3.5-4 hours |
Cost Considerations
High-power on-board chargers are more expensive than lower-power models. Prices increase with power rating, with 6.6 kW chargers generally being more affordable than 11 kW or 22 kW models. When budgeting, consider not only the cost of the charger itself but also installation expenses, which may include wiring, mounting hardware, and any modifications needed to adapt to the vehicle.
It's important to strike a balance between cost and performance. While a 22 kW charger offers the fastest charging speed, it may be overkill if you primarily charge at home and have a smaller battery pack. For most Dacia Logan II conversions, a 6.6 kW or 11 kW charger is likely the more cost-effective choice.
Summary
Choosing the right high-power on-board charger for your Dacia Logan II electric conversion requires careful consideration of power rating, compatibility, size, cooling, safety features, communication protocol, and cost. By evaluating these factors based on your specific needs and conversion characteristics, you can select a charger that makes driving your electric Logan II more convenient and enjoyable.
Remember, a high-power on-board charger is an investment that can significantly enhance the practicality of your converted vehicle. Take the time to research different models, compare their specifications, and consult with other EV conversion enthusiasts or professionals to make an informed decision. With the right charger, your Dacia Logan II electric conversion will be ready for any journey with minimal charging downtime.
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Get Your Free Consultation NowFrequently Asked Questions
For most Dacia Logan II conversions with battery capacities between 20-40 kWh, a 6.6 kW charger offers the best balance of charging speed and cost. If you have a larger battery (30+ kWh) or frequently take long trips, consider an 11 kW charger for faster charging.
Yes, to achieve the full charging speed of an 11 kW or 22 kW charger, you need a three-phase power supply. These chargers will still work with single-phase power but at reduced power levels (typically 3.6-7.2 kW depending on the model).
Installation complexity depends on the charger model and your vehicle's configuration. While some basic mechanical skills are required, the main challenge is proper electrical integration with the battery system and BMS. We recommend professional installation for high-power chargers.
Yes, it's possible to upgrade, but you'll need to ensure your vehicle's electrical system can handle the increased power. This may require upgrading wiring, fuses, and possibly the battery management system. It's often more cost-effective to install the appropriate charger from the beginning.
Absolutely. High-power chargers from reputable manufacturers include multiple safety features like overcurrent, overvoltage, and overheating protection. Always choose chargers with proper certifications (like IEC 61851) and have them installed by qualified professionals.
