General EV Charging FAQs
Customers considering an EV charger often have a range of questions, from the very basic to more technical or financial concerns, including:
How long does it take to charge an EV at home? For a standard 7.4kW home charger, it typically takes 6-8 hours to fully charge an average EV battery (e.g., 60-70 kWh) from empty. Charging times vary depending on your car's battery size and its maximum accepted charging rate.
Can I use a standard 3-pin plug to charge my EV? You can use a standard 3-pin plug, but it's often referred to as "granny charging" because it's extremely slow (around 3-5 miles of range per hour). It's not recommended for regular use due to slow speed and potential overheating risks if the socket isn't rated for continuous high load.
Do I need professional installation for an EV charger? Yes. Installing an EV charger involves working with your home's main electrical supply and must be done by a qualified and certified electrician to ensure safety and compliance with regulations. Trying to install it yourself is dangerous and can void warranties or insurance.
What are the electrical requirements for a home EV charger? For a 7.4kW charger (most common for homes), you need a single-phase 32A dedicated circuit installed from your consumer unit (fuse box). For a 22kW charger, you would need a three-phase supply, which is rare in UK residential properties and requires a significant and costly upgrade from your Distribution Network Operator (DNO).
Do I need an earth rod for my EV charger installation? Historically, yes. However, many modern smart chargers now incorporate built-in PEN fault protection, which often negates the need for an earth rod, simplifying installation and reducing costs. Your installer will confirm this during the survey.
Do I need off-street parking to install a home EV charger? Generally, yes. Home chargers are designed for properties with a dedicated off-street parking space (driveway, garage) where the charger can be safely mounted and the cable can reach the car without crossing public pathways.
How long does an EV charger installation take? A standard home EV charger installation typically takes 3-5 hours on the day, assuming no major complications or unexpected electrical remedial work. A pre-installation survey will assess your property's suitability.
Do I need permission to install an EV charger? If you own your property, generally, no planning permission is required as long as the charger meets certain criteria (e.g. not exceeding a certain size or height, not on a listed building, not crossing public land with cables) If you rent or live in a flat you must obtain permission from your landlord, freeholder, or management company before installation.
What is a DNO notification? Your installer is legally required to notify your local Distribution Network Operator (DNO) of the EV charger installation. This is to ensure your local grid can handle the increased electrical load safely. For 7.4kW chargers, this is usually a "connect and notify" process. For 22kW chargers, pre-approval is often required.
Can I connect my EV charger to my solar panels? Some smart chargers, notably the Myenergi Zappi, are specifically designed to integrate with solar PV systems, allowing you to prioritise charging your EV using surplus solar energy generated at your home. This is a great way to maximise your renewable energy self-consumption.
Can I charge my EV using cheap off-peak electricity? Yes! This is one of the biggest benefits of a smart home charger. Many energy suppliers offer specific EV tariffs with significantly cheaper electricity rates during off-peak hours (e.g. overnight) Your smart charger can be scheduled to charge only during these times.
Will an EV charger increase my electricity bill significantly? EV chargers will increase your bill as you're using more electricity. However, the cost per mile is usually much lower than petrol or diesel. Utilising off-peak tariffs and smart charging can significantly mitigate the increase.