Key Insight
Most UK homes can install a 7.4kW charger tomorrow. But if you have three-phase power, 22kW charging transforms your EV from an overnight ritual into a coffee-break top-up. The difference? Your electrical infrastructure.
Understanding EV Charging Speeds
The electric vehicle charging landscape has evolved dramatically since the early days of "granny chargers." Today's market offers a spectrum of solutions, each with distinct advantages and infrastructure requirements.
The Four Tiers of Home Charging
The 2026 Range Calculator
Pro Tip: At 7.4kW, you're adding approximately 26 miles of range per hour. Perfect for overnight charging.
What Does Your Home Need?
The charging speed you can achieve isn't about the charger alone—it's about your home's electrical capacity. Here's the reality check most installers won't give you upfront.
7.4kW Installation
- ✓Standard single-phase supply (230V)
- ✓32A dedicated circuit
- ✓Modern consumer unit with RCD protection
- ✓No DNO notification required
22kW Installation
- ✓Three-phase supply (400V)
- ✓32A three-phase circuit
- ✓Type B RCD or equivalent protection
- !DNO application required (we handle this)
Vehicle-to-Home (V2H): The Next Frontier
Your EV isn't just transportation—it's a mobile battery pack capable of powering your entire home during outages or peak pricing periods. With V2H technology, a 75kWh battery can run an average UK home for approximately 6 days.
V2H Use Cases
Seamless power continuity during blackouts or planned maintenance.
Discharge during expensive peak hours, recharge overnight at low rates.
Store midday solar generation for evening consumption.
Real-World Economics
The maths is straightforward: faster charging adds immediate convenience, but the long-term value compounds when you factor in electricity tariff optimisation and V2H capabilities.
Annual Charging Costs (15,000 miles/year)
Assumes 3.5 miles/kWh efficiency and 50mpg for petrol comparison.
Deep Dive: Three-Phase Infrastructure
Thinking about upgrading to three-phase for maximum charging speed? The infrastructure implications extend far beyond the charger itself.
Read our comprehensive three-phase guideSafety & Compliance
All EV charger installations must comply with BS 7671:2018+A2:2022 (18th Edition Wiring Regulations) and the EV Charging Equipment Regulations 2022. This isn't optional paperwork—it's essential safety infrastructure.
Critical Safety Requirements
- →Dedicated circuit with appropriate overcurrent protection
- →Type A RCD minimum (Type B recommended for three-phase)
- →PEN fault protection (mandatory for installations after 2022)
- →Smart charging capability (government requirement)
- →Earthing and bonding verification
Speed Up Your DNO Application
Download our professionally vetted 2026 DNO application template. Using this technical language reduces the risk of rejection and speeds up your quote process.
Integravolt Tip:
Don't just ask for "more power." Ask for "60kVA Three-Phase with G100 Load Management." It tells the DNO you won't blow their local transformer.
Subject: Request for Three-Phase Supply Upgrade - [Your Property Address] Dear Distribution Network Operator, I am writing to request a formal quotation for upgrading the electrical supply to my property at [Your Full Address, Postcode]. REQUESTED SUPPLY SPECIFICATION: - Three-phase 400V supply - 60kVA total capacity (20kVA per phase) - G100 load management system integration - Smart meter compatible infrastructure INSTALLATION PURPOSE: The upgrade is required to support the following registered electrical installations: - EV charging infrastructure (22kW three-phase wallbox) - Heat pump system (suitable for property heating demand) - Solar PV array with battery storage system - Standard domestic load TECHNICAL COMPLIANCE: All electrical work will be carried out by a registered Part P electrician in accordance with BS 7671:2018+A2:2022 (18th Edition Wiring Regulations). The installation will include: - Type B RCD protection - PEN fault protection device - Appropriate overcurrent protection per circuit - Load management system to prevent phase imbalance SITE INFORMATION: - Property Type: [Detached/Semi-detached/Terraced] - Current Supply: [Single-phase 100A / Other] - Distance to nearest transformer: [Approximate distance if known] - Parking/Access: [Available for DNO vehicles] Please provide: 1. Formal quotation for the supply upgrade 2. Estimated timeline for completion 3. Any additional infrastructure requirements 4. Confirmation of local network capacity I am available for a site survey at your earliest convenience. Please contact me via [Phone Number] or [Email Address]. Thank you for your attention to this matter. Yours faithfully, [Your Name] [Date]
Remember to replace [bracketed fields] with your specific information before submission
Next Steps: Professional Assessment
Does your local grid support 22kW charging? Is your consumer unit adequate for a dedicated EV circuit? We provide comprehensive site surveys, handle all DNO applications, and ensure full regulatory compliance.
About the Author
The Integravolt Technical Team comprises certified electrical engineers specializing in EV infrastructure, renewable energy integration, and smart home systems. With over 500 EV charger installations across the UK, we bring real-world experience to every technical guide.