Usually yes, but rarely with both cars charging at full power at the same moment. Two 7.4 kW chargers running together draw about 14.8 kW, roughly 64 A at 230 V, before the rest of the house uses anything. The normal answers are load management, charging the cars one after the other, or letting the two cars share a smaller power budget. Your installer checks the supply and designs around it.
Key Takeaways
- Two 7.4 kW chargers draw about 64 A together, more than most homes can spare at full power.
- Load management or staggered scheduling makes two chargers work on a normal supply.
- A supply upgrade is possible but is normally the last resort for a home.
- Tell your installer about the second car at survey stage, not after the first install.
The Maths: What Two 7 kW Chargers Actually Draw
| Setup | Combined draw | What it means in practice |
|---|---|---|
| One 7.4 kW charger | 7.4 kW, about 32 A | A standard single-phase installation most homes can support. |
| Two chargers at full power | About 14.8 kW, about 64 A | Chargers alone, before cooking, heating or hot water. Many homes have little headroom left. |
| Two chargers sharing a 7.4 kW budget | 3.7 kW each while both are plugged in | Each car charges at half rate; when one finishes, the other gets the full rate. |
In many UK homes the main fuse at the meter is rated 60 A, 80 A or 100 A, and everything in the house shares it. Two chargers at 64 A leave very little for the rest of a busy home, which is why “just fit two” is rarely the design. As our guide to dynamic load balancing explains, the fix is to make the chargers respond to the house, not to uprate the house to suit the chargers.
The Three Ways Installers Make It Work
- Load management. A clamp meter on the main supply watches the house load. When the house is busy, the chargers ease off; when it is quiet, they speed up. This is the most flexible option and the usual recommendation.
- Staggered scheduling. The cars take turns: one charges in the early evening, the other after midnight, set in the app or the cars. Simple, and it pairs well with off-peak tariffs, as covered in our guide to smart charging and time-of-use tariffs.
- A bigger supply. A three-phase upgrade or a higher-capacity service can support two full-rate chargers. It costs the most and involves your network operator, so it is normally the last resort for a home.
Two-EV households run into this in everyday ways, not just on paper; our article on the charging duo problem works through the routines that solve it.
The North American Version of the Same Problem
The maths differ but the problem is identical. Two 40 A chargers draw 80 A continuously, and because EV charging is a continuous load under the National Electrical Code, each one sits on a breaker rated at 125% of its current: 50 A each, 100 A of panel capacity for the pair. A 100 A service cannot carry that plus the house. Load management or a service upgrade is the answer there too. Our guide to load calculation basics shows how the numbers are worked out.
One Unit Built for Sharing
Where two cars charge side by side every night, a dual-connector unit can be simpler than two separate wallboxes. The EV-AC03201T has two Type 2 connectors and shares up to 43 kW between them (22 kW per connector), with OCPP 1.6J and RFID access control, in an IP54 enclosure. Sharing is built into the hardware rather than arranged between two units. For ordinary houses, a pair of load-managed wallboxes from the residential charging range is usually the neater fit.
Frequently Asked Questions
Will both cars still be charged by morning on a shared budget?
For typical daily driving, usually yes. A car that needs 20 kWh overnight gets it in about five and a half hours at 3.7 kW. Very high daily mileage in both cars is the case that pushes you toward a bigger supply.
Do I need permission to fit a second charger?
In the UK your installer notifies the distribution network operator (DNO) about charge point installations, and a second unit makes the load check more important, not less. In the US, permits and inspection follow local rules. Either way, the installer handles the paperwork.
Is one dual-connector charger better than two separate chargers?
It depends on the site. One unit means one installation and built-in sharing. Two units give independent positioning and one still works if the other is out of service.
Related Reading
- What Is Dynamic Load Balancing, and Why Does Your Wallbox Need It?
- The Charging Duo Problem: How Two-EV Households Can Charge Smarter
- Does Load Balancing Increase EV Charging Speed?
- Adding EV Chargers to a Building: Load Calculation Basics
