Switching to an electric vehicle is one of the most rewarding upgrades you can make for your home and the environment. In Redhill and across Surrey, more homeowners are trading the petrol station for the convenience of home charging. However, a home EV charger is not just another appliance like a toaster or a kettle; it is a high-power piece of electrical infrastructure.
At ADS Electrical, we’ve seen everything from DIY disasters to "near-miss" electrical fires caused by poor planning. Whether you’ve just taken delivery of your first Tesla or you’ve been driving electric for years, you might be making critical errors that cost you money, damage your battery, or: worst of all: compromise your home's safety.
Here are the seven most common mistakes people make with their EV chargers and the professional advice you need to fix them.
1. Ignoring Your Home’s Electrical Capacity
The biggest mistake happens before the charger is even out of the box. A standard 7kW home charger draws about 32 amps of current. For context, that is roughly the same as running three electric ovens at the same time.
Many older homes in Surrey still have a 60-amp or 80-amp main fuse. If you plug in your car while the shower is running, the oven is on, and the heat pump is kicking in, you risk blowing the main fuse or overheating your consumer unit.
The Fix: Always have a professional electrician in Redhill perform a "load assessment" before installation. At ADS Electrical, we check your main fuse capacity and, if necessary, install a "load-balancing" device. This clever bit of tech automatically slows down your car’s charging if the house is using too much power, preventing a total blackout. If your system is significantly outdated, you might even require a domestic rewire to bring your home up to modern safety standards.
2. Using the "Granny Cable" as a Permanent Solution
Most EVs come with a portable charger that plugs into a standard 3-pin domestic socket. These are nicknamed "granny cables" because they are slow enough to visit your grandmother, stay for tea, and still not be finished.
While they are fine for emergencies, they are not designed for daily use. Standard UK sockets were never intended to run at full power for 10 or 12 hours straight, day after day. This can lead to the socket melting, scorching, or even starting a fire.
The Fix: Invest in a dedicated wallbox. Not only is it three times faster than a 3-pin plug, but it’s also designed for continuous heavy loads. If you're still relying on a 13-amp socket, it’s time to upgrade to a proper home charging point in Surrey.
3. Poor Placement and Weathering
We often see chargers installed in the most "convenient" spot near the fuse board, which ends up being the least convenient spot for the car. If your cable has to stretch across a walkway or reach around another vehicle, you’re creating a trip hazard and putting strain on the charging port.
Furthermore, while most chargers are IP-rated for outdoor use, installing them in a completely exposed area with no shelter can lead to faster degradation of the plastics and seals over several Surrey winters.
The Fix: Think about where your car’s charging port is located (it varies by brand). Ideally, the charger should be within 2 to 3 metres of the port. If your car is parked on a driveway, ensure the cable doesn’t cross any public footpaths. If you lack a garage, consider a small weatherproof "hood" or canopy to keep the worst of the rain and snow off the unit.
4. Skipping Surge Protection
Surrey is no stranger to the occasional thunderstorm, but even minor fluctuations in the national grid can send a "spike" of electricity into your home. A dedicated EV charger is full of sensitive electronics, and your car’s battery management system is even more delicate.
In 2026, UK wiring regulations (BS 7671) strongly recommend Surge Protection Devices (SPDs). Some "budget" installers skip these to keep the quote low, leaving your £40,000 car unprotected.
The Fix: Ensure your installer includes an SPD in your consumer unit or within the charger itself. It is a small price to pay to protect both your charger and your vehicle’s battery from expensive electrical damage.
5. Missing Out on Smart Tariffs
Are you plugging in your car at 6:00 PM and letting it charge immediately? If so, you are likely paying the highest possible rate for electricity. One of the greatest benefits of home charging is the ability to use "Time of Use" tariffs.
The Fix: Use the smart features of your charger. Most modern units, like the Zappi or Myenergi systems, allow you to schedule charging during the "off-peak" hours (usually between midnight and 5:00 AM). In some cases, you could be paying as little as 7p or 8p per kWh compared to 25p+ during the day. Over a year, this can save you hundreds of pounds.
6. Dangerous Cable Management
Leaving your charging cable coiled on the ground is a recipe for disaster. Cables left in puddles can suffer from water ingress over time, and driving over a connector just once can crack the casing. Worse yet, a tangled cable on a dark evening is a major trip hazard for you and your neighbours.
The Fix: Install a dedicated cable holster or a wall hook. Keeping the cable neatly coiled not only looks better but also protects the internal copper wiring from "kinking" or breaking. Always ensure the connector is clicked firmly into its holster when not in use to keep the pins dry and clean.
7. The "Man with a Van" Installation
EV chargers are high-voltage equipment. We have seen many "handyman" installations where the wrong cable size was used, or the earthing (grounding) was not done correctly. In the UK, EV chargers require specific "Type A" or "Type B" RCD protection and, in many cases, an open-PEN protection device to prevent electric shocks if a fault occurs in the street's power lines.
If your installer isn't NICEIC-approved or OZEV-authorised, they might not even know these requirements exist.
The Fix: Only use a certified EV charger installation Redhill specialist. A professional installation comes with an Electrical Installation Certificate (EIC), which you will need for your insurance and if you ever decide to sell your home.
Why ADS Electrical is Surrey’s Choice for EV Charging
At ADS Electrical, we don’t just "fit" chargers; we design charging solutions. As NICEIC Approved Contractors, we provide a full service from the initial load assessment to the final safety certification. Whether you’re looking for a solar-compatible charger to make the most of your panels or a sleek untethered unit for a minimalist look, we provide free quotes within 24 hours.
Don't let a simple mistake turn your EV dream into a headache. Get your installation done right the first time by the local experts who care about safety as much as you do.
Ready to upgrade your home charging setup? Contact ADS Electrical today for a professional EV charger installation Redhill and start charging smarter.