Should I buy a 3.5KW or 7KW portable EV charger?

When choosing a portable EV charger, one of the most common dilemmas is deciding between a 3.5KW or 7KW model. This decision can significantly impact your charging experience, vehicle performance, and even long-term costs. So, how do you choose the right one for your needs?

What Do 3.5KW and 7KW Mean?

Before we dive into which option is better, let’s understand what 3.5KW and 7KW mean. The ‘KW’ stands for kilowatts and is used to measure the power output of a portable EV charger. Essentially, it tells you how fast the charger is powering your electric vehicle (EV).

  • 3.5KW Portable EV Charger: Delivers 3.5 kilowatts of power, typically suited for slower, overnight charging.
  • 7KW Portable EV Charger: Delivers 7 kilowatts, offering significantly faster charging

The higher the KW rating, the quicker your EV will charge.

Charging Speed Comparison

The primary difference between a 3.5KW and a 7KW portable EV charger is how quickly they charge your vehicle. On average, a 3.5KW charger will take around 10-12 hours to fully charge a medium-sized EV battery (like a 40-50 kWh battery). This makes it ideal for overnight charging when speed is not a priority.
In contrast, a 7KW charger can cut charging time nearly in half, often fully charging the same vehicle in 6-8 hours. If you’re in situations where time is critical—like needing to recharge between errands or road trips—the faster 7KW option becomes a more attractive choice.

Pros and Cons of a 3.5KW Charger

Pros:

  • Cost-effective: 3.5KW chargers are typically cheaper, both in initial cost and long-term
  • Ideal for overnight charging: If you charge at home or when you’re parked for extended periods, 3.5KW is sufficient.
  • Less strain on electrical systems: This lower power output reduces the load on your home’s electrical grid.

Cons:

  • Slower charging: If you need a quick top-up, a 3.5KW charger will take significantly longer.
  • Limited for larger EVs: Vehicles with bigger batteries, such as some long-range or performance EVs, may not fully charge overnight.

Pros and Cons of a 7KW Charger

Pros:

  • Faster charging: A 7KW charger can save you several hours compared to a 3.5KW model.
  • More future-proof: As EV battery sizes continue to grow, a 7KW charger ensures you’ll be able to handle larger vehicles or newer models.
  • More versatile: You can charge your EV more flexibly, making it useful for shorter stops.

Cons:

  • Higher cost: Both the initial purchase price and long-term energy usage are higher with a 7KW charger.
  • Higher demand on the electrical grid: You may need to ensure your electrical system can handle the increased load, which might require additional investment in upgrading your home’s infrastructure.

Consider Your Usage and EV Type

When deciding between a 3.5KW and 7KW portable EV charger, consider your specific needs and the type of EV you drive.

Daily Commuters:

If you mostly drive short distances, such as for daily commutes or errands, and typically plug in your vehicle overnight, a 3.5KW charger may be all you need. It can charge your EV slowly but steadily while you sleep, ensuring it’s ready for the next day without overloading your electrical system.

Long-Distance Drivers:

For those who often take longer trips or have larger battery capacities (like long-range EVs), a 7KW charger provides faster charging times that can make a real difference. This is especially useful if you’re frequently on the go and need to quickly replenish your battery before your next trip.

Consider Charging Locations and Electrical Capacity

In addition to your driving habits and vehicle type, you’ll want to evaluate where you’ll be charging most frequently.

  • Home Charging: If you plan to charge at home, check whether your electrical system can handle the extra load of a 7KW charger. In some cases, upgrading your home’s electrical system may be necessary, which could increase the overall cost of installation.
  • Public Charging: If you primarily rely on public charging stations, a 7KW portable charger may be unnecessary. Public stations often provide fast-charging options, meaning your home or portable unit will only be for occasional or backup use.
  • Camping or Off-Grid Scenarios: In remote areas with limited electrical access, a 3.5KW charger might be more practical, as it places less strain on portable generators or limited power supplies.

Final Verdict: Which Portable EV Charger Is Best for You?

Choosing between a 3.5KW and 7KW portable EV charger ultimately comes down to your specific needs, driving habits, and budget.

  • Opt for the 3.5KW charger if you are a casual driver who charges mostly overnight, or if you’re looking for a cost-effective, low-impact solution.
  • Choose the 7KW charger if you need faster charging times, drive long distances frequently, or want a more future-proof solution for bigger EV batteries.

By considering these factors, you can make the right choice and enjoy a seamless EV charging experience that suits your lifestyle.

Last Updated on October 18, 2024 by yundic