Fast Charger vs Slow Charger

If you are thinking about switching to an electric vehicle, one of the first big decisions you will make is which type of home charger to install. Most homeowners are surprised to learn that not all EV chargers are the same. The speed of your charger affects how quickly you can hit the road, how much you pay for electricity and how well your electrical system can handle the load.

In simple terms, there are two main types of EV chargers for residential properties:

1. Slow chargers
2. Fast chargers

Both will charge your car, but they suit different lifestyles and driving habits. Choosing the wrong one can lead to frustration, longer charge times and even electrical upgrades you were not prepared for.

To help you decide, here is a straightforward breakdown of how each one works and which option fits different routines.

What is a Slow Charger

A slow charger is typically a 3 kW charger, often referred to as a standard or trickle charger. Most slow chargers plug into a standard household socket or use a portable charging cable supplied with your EV.

How long does it take?

A slow charger can take 10 to 12 hours or longer to fully charge an EV, depending on your vehicle’s battery size.
This option is ideal if:

• You rarely drive long distances
• You work from home or your car is parked overnight for long periods
• You want the most budget friendly charging solution

Slow chargers are gentle on your home’s electrical system and usually do not require any major upgrades. You simply plug in at night and wake up to a charged vehicle.

However, the biggest downside is flexibility. If you need to leave unexpectedly with a low battery, you will not get enough charge in a short window.

What is a Fast Charger

A fast charger is usually a 7 kW home wall charger, professionally installed and fully dedicated to EV charging.

How long does it take?

A fast charger can charge your EV in 4 to 6 hours, often giving you enough range for daily use after just one to two hours of charging.

A fast charger is ideal if:

• You have a busy lifestyle and need quicker charging
• You drive your EV multiple times per day
• You want to maximise off peak charging rates

With a fast charger, you plug in while having dinner or watching TV and gain enough battery to handle your next trip. Fast chargers also come with smart features such as charging scheduling, usage tracking and cost monitoring.

The only catch is that your fuseboard may need to be checked. Some homes require an upgrade to safely handle the increased load, especially older properties.

Cost Comparison

Slow charger:

Low cost and easy to use but slower charging

Fast charger:

Faster charging and more convenience but may involve installation and possible electrical upgrades

A fast charger is usually the best long term value because it allows you to charge when electricity is cheapest, typically during off peak hours.

Which One Fits Your Routine

Here are two real world lifestyle examples.

If this sounds like you:

• You only drive short distances
• You mainly charge overnight
• You are rarely in a rush

You are a perfect match for a slow charger.

If this sounds like you:

• You drop kids at school
• Go to work
• Run errands during the day
• Need flexibility and speed

A fast charger gives you the convenience you need.

Think of slow charging as filling your car overnight while you sleep, while fast charging gives you on demand range without waiting half a day.

How to Choose the Right Charger for Your Home

When we assess a home, we consider three things:

• Your daily mileage
• Your home’s electrical capacity
• Whether you want smart charging or just basic charging

Some homeowners believe a faster charger is always better. In reality, a slow charger works perfectly fine for low mileage users, and they avoid paying for upgrades they do not need. Others value the convenience and time savings that a faster charger provides.

There is no one size fits all. The best charger is the one that fits your life.

Don’t Forget Safety

Charging an EV draws more continuous power than most people realise. Using the wrong charger or plugging into poorly wired sockets can cause heat build up or even electrical faults.

This is why a professional assessment is important. A certified electrician checks:

• Fuseboard rating
• Wiring condition
• Whether a dedicated circuit is required
• If surge protection and RCD protection are installed

A quick inspection ensures everything is safe before installation.

Thinking About Installing an EV Charger

We can help you find the perfect charger for your car and your lifestyle.

At JJB Electrical, we install EV chargers for homeowners across Cheshunt, Waltham Cross, Hertfordshire and Essex. Before installation, we check your fuseboard, assess your existing wiring and make sure everything meets current safety regulations. You get clear advice, transparent pricing and a charger that fits your daily routine.

Not sure which charger you need?

We can guide you.

Call 01992 276087 to speak with our team or request a quote online and we will get back to you promptly.