Two-car households across Scotland are switching to electric faster than ever, and the question of a second home charger comes up regularly. 

The short answer is yes, but your electrical supply, consumer unit, and DNO approval requirements all need to be checked before any work begins. 

This guide covers what Scottish homeowners actually need to know.

Is It Technically Possible?

Yes, and it is more common than most people think.

Two chargers on the same property is entirely achievable provided your incoming electrical supply can support the combined load. 

The practical question is not whether it can be done, it is whether your current supply has the capacity to handle it without a costly upgrade. 

Electric car charging at home covers what a standard single-charger installation involves, which is useful context before scaling up to two.

What Limits a Two-Charger Installation?

Incoming Supply Capacity

Most Scottish homes have a 100A single-phase supply, providing around 23 kW of usable power.

Two 7 kW chargers running simultaneously use 60 to 70% of that capacity, leaving limited headroom for the rest of the house. In practice, most households do not charge both cars at peak consumption times, but the supply must be rated to handle it if they do.

Consumer Unit Capacity

Each charger requires a dedicated circuit with its own MCB.

If your consumer unit has no spare ways, it will need upgrading or a secondary unit adding before the chargers can be installed. This adds to the overall cost but is straightforward for a qualified electrician.

DNO Approval

Under G98 regulations, EV chargers above 3.68 kW require notification to your Distribution Network Operator before installation.

For Scotland, that is Scottish and Southern Electricity Networks (SSEN) for most areas. Two 7 kW chargers require notification as a minimum, and in some cases a formal assessment. Understanding G98, G99 and G100 explains what is involved and how your installer should handle this on your behalf.

Property Wiring Condition

Older Scottish properties, particularly tenements and pre-1970s houses, sometimes have ageing wiring that needs upgrading before additional high-load circuits can be added safely.

A site survey identifies this before any work begins. No reputable installer proceeds without checking the existing infrastructure first.

Do You Need a Supply Upgrade?

Not always, but sometimes yes.

Most modern homes with a 100A supply can accommodate two 7 kW chargers without an upgrade, provided household loads are typical. Older properties with a 60A or 80A supply may not have sufficient headroom. 

Your installer carries out a load calculation to confirm this. If an upgrade is needed, SSEN typically processes EV-related supply upgrades within 4 to 8 weeks.

Smart Load Management: The Practical Solution

The most cost-effective approach for most households is smart load management rather than a supply upgrade.

Load management systems monitor total household consumption in real time and automatically reduce EV charging output when other large loads are running. 

When demand drops, charging speed increases again. Smart chargers from myenergi, Ohme, and Easee all support load balancing natively, allowing two chargers to share available capacity intelligently without ever exceeding your supply limit.

Can Solar Panels Power Two EV Chargers?

Yes, and it significantly reduces running costs for a two-EV household.

A solar-aware charger like the myenergi Zappi detects surplus generation and diverts it to EV charging automatically. With two Zappi units, surplus solar can be split between vehicles or prioritised to one while the other charges at a minimum rate. How EV charging works and what it costs covers the real-world running cost comparison between solar-charged and grid-charged EVs in more detail.

Are There Grants Available in Scotland?

The UK-wide residential EV chargepoint grant no longer covers homeowners in houses, as confirmed by the Office for Zero Emission Vehicles (OZEV).

Scottish homeowners should check Transport Scotland for current local schemes, particularly for rural properties and low-income households where additional support is sometimes available. Your installer should be across current eligibility at the time of quotation.

What Does It Cost?

Installation Scenario	Typical Cost Range
Two chargers, adequate supply, standard install	£1,400 to £2,200
Two chargers, consumer unit upgrade required	£1,800 to £2,800
Two chargers, supply upgrade required	£2,500 to £4,000+
Two solar-integrated smart chargers	£1,800 to £3,000

A qualified installer will provide a fixed-price quotation after a site survey that accounts for cable runs, consumer unit capacity, and DNO requirements for your specific property.

Choosing the Right Chargers

Smart vs Standard

For a two-charger installation, smart chargers are not optional, they are essential.

Load balancing between two units requires communication between chargers or a central energy management system. Basic chargers cannot do this and would require hard output limits that reduce charging speed permanently.

Solar Integration

If you have solar or plan to add it, specify solar-compatible chargers from the outset.

The cost difference at installation is modest. Retrofitting solar compatibility later is more expensive and sometimes not possible with certain charger models. Home battery storage covers how battery storage integrates with EV charging for households wanting to maximise solar self-consumption across both vehicles.

What to Ask Your Installer Before Booking

• Will you carry out a full load calculation before quoting?
• Are the chargers compatible with load balancing between two units?
• Will you handle DNO notification as part of the installation?
• Are the chargers compatible with solar surplus charging?

Any installer who skips the load calculation or does not mention DNO notification for a two-charger setup is cutting corners.

Conclusion

Installing two EV chargers at home in Scotland is straightforward in most cases and does not require a supply upgrade if smart load management is used. Confirm your supply capacity, choose smart chargers that support load balancing, and ensure your installer handles DNO notification correctly. For solar households, specifying solar-aware chargers from the outset makes the whole setup significantly more cost-effective over time.

Frequently Asked Questions

Can I install two 7 kW chargers on a standard 100A supply?

In most cases yes, with smart load management in place. A load calculation by a qualified electrician confirms whether your specific supply and household load profile can support it without an upgrade.

Do I need planning permission for two EV chargers in Scotland?

Most installations fall under Permitted Development rights. Listed buildings and some conservation areas are exceptions. Your installer should confirm this for your property before proceeding.

How long does a two-charger installation take?

A standard installation is typically completed in one day. Installations requiring a consumer unit upgrade may take two days. Supply upgrades require a separate DNO visit and add 4 to 8 weeks to the timeline.

Can both chargers run at full speed at the same time?

Yes, if your supply capacity supports it. With smart load management, both run simultaneously at reduced individual speeds when combined demand approaches your supply limit, increasing automatically when other loads drop.

When is the best time to charge two EVs at home?

Overnight is the ideal time for most households. Demand is lowest, and smart chargers can be scheduled to run during off-peak tariff periods to minimise running costs for both vehicles.