Home EV Charging: Can Solar Help Deliver EDF's Claimed Savings?

Home EV charging: a big savings claim worth unpacking

EDF's claim that home EV charging could cut annual fuel costs by more than £1,350 is this week's standout story for households considering an electric car. It also raises a practical question for anyone planning solar: could the roof help power the driveway as well as the house?

The important word is “could”. The headline does not establish the mileage, vehicle efficiency, electricity tariff or comparison fuel price behind that figure. It should not be treated as a guaranteed saving, or as a saving delivered by solar panels. For businesses, the same caution applies when comparing electric company cars or vans with existing vehicles.

The useful takeaway is that where and when you charge matters. Solar can strengthen the case, but only when the system fits your driving routine and electricity use.

Start with your own EV charging costs

Before choosing equipment, work out how much energy your driving requires. Annual mileage and the vehicle's real-world efficiency provide a starting point. Allow for charging losses too: the electricity drawn from the supply will be higher than the energy ultimately stored in the car's battery.

Next, apply the rates you would actually pay. EV electricity tariffs may offer cheaper charging during particular hours, but compare the full tariff, including daytime prices, standing charges and eligibility requirements. A low overnight rate is less compelling if higher daytime charges outweigh the charging benefit.

Include any public charging you expect to need. Someone who regularly charges at home overnight has a different cost profile from a driver reliant on public chargers. Compare the resulting annual electricity cost with your current fuel spending, then consider charger installation and vehicle costs separately. Fuel savings alone are not the whole ownership calculation.

Solar panels for EV charging: timing is everything

Solar panels for EV charging are most useful when the vehicle is plugged in while the roof is generating. That can suit home workers, households with a second car, or businesses whose vehicles return to base during daylight. A car parked elsewhere throughout the working day cannot directly use your midday generation.

A compatible smart EV charger can help direct surplus solar into the vehicle, subject to the charger's settings and minimum charging requirements. Without suitable controls, charging may draw electricity from the grid as well as the panels. Ask how the proposed equipment behaves when clouds reduce generation or household demand rises.

Solar electricity also has an opportunity cost: using it in the car can mean giving up an export payment. The benefit depends on the import charge avoided versus the export income forgone. UK solar generation is generally lower in winter, so annual projections should reflect seasonal changes rather than assume summer performance throughout the year.

Does solar battery storage improve the equation?

Solar battery storage can shift daytime generation into the evening, potentially helping when the car arrives home after sunset. Some systems can also charge from the grid during cheaper periods. Neither approach automatically makes a battery worthwhile: purchase costs, usable capacity, charging losses and tariff differences all affect the result.

Avoid assuming a household battery will cover both evening household demand and a substantial vehicle charge. Ask for a comparison of solar alone, solar with a compatible charger, and solar with storage. Each option should use the same driving and household assumptions.

• Check whether direct off-peak charging is cheaper than routing grid electricity through a home battery.
• Confirm that the charger, battery and tariff controls can work together without conflicting schedules.
• Assess savings across the whole property, without counting the same solar electricity twice.

What commercial EV charging changes for businesses

For businesses, EDF's household savings headline is a prompt to investigate, not a forecast for the fleet. Commercial EV charging needs a separate assessment using vehicle mileage, parking schedules, electricity contract rates and site demand.

Workplace solar can align well with vehicles parked during daylight. Delivery vehicles away all day may offer less direct overlap. Before commissioning solar panel installation and chargers, check electrical capacity and whether load management or network upgrades are needed. A coordinated design can balance charging with other site loads, while keeping vehicle availability central to the decision.

How Solar Pro Solutions can help

With more than 20 years' experience, Solar Pro Solutions helps UK homeowners and businesses plan solar PV, battery storage, EV charging and maintenance together. We can assess your roof, electricity use and charging routine to identify a suitable approach.

Bring your electricity bills, tariff details and typical mileage. The aim is a practical proposal based on your property and driving needs, not a headline savings figure that may not fit.