Covering an average Irish car's yearly mileage from your own roof takes about seven panels. The average private car in Ireland drove 15,196 km in 2023, the most recent year the CSO has published. SEAI puts a typical EV at 15 kWh per 100 km. That is roughly 2,300 kWh a year at the wheels, or about 2,500 kWh drawn from the meter once you allow for charging losses, which a modern 440 W panel covers seven times over at Irish yields. The number is real. It is also close to useless on its own, because it quietly assumes you can capture every unit your roof makes, at the moment it makes it.
- Average Irish car: 15,196 km a year (CSO, 2023) → about 2,500 kWh at the meter
- That is roughly seven 440 W panels, or a 3 kWp array, at Irish yields of 800–900 kWh per kWp
- A home charger delivers up to 7.4 kW (SEAI). A 3 kWp roof cannot feed it, so an ordinary charger tops up the difference from the grid
- The SEAI home charger grant is €300, and a charger plus installation runs €1,200–€1,600
- At August 2026 rates, exporting your solar at 18.5c and charging at 9.42c between 2am and 6am leaves you about 9c per kWh better off than charging straight off the panels
- Without an EV night rate, the opposite holds: solar charging beats a 37.60c day rate by a wide margin
How Many Panels an Irish EV Actually Needs
Three numbers do the work here, and all three are published rather than estimated. The CSO's road traffic volumes table puts the average private car in the State at 15,196 km in 2023. SEAI says an EV uses about 15 kWh per 100 km. And a solar panel in Ireland returns 800–900 kWh per kWp of capacity per year, so a 440 W panel makes roughly 370 kWh.
One adjustment before the arithmetic. Some of what leaves the meter never reaches the battery. SEAI lists your car's charging efficiency alongside the electricity rate and the car's consumption as one of the three things that set what home charging costs you, which means the figure to size against is the meter reading rather than the road figure. Add roughly a tenth and 15 kWh per 100 km at the wheels becomes about 16.5 kWh at the meter.
| Your yearly mileage | Electricity needed | 440 W panels | Array size |
|---|---|---|---|
| 10,000 km | ~1,650 kWh | 5 | 2.2 kWp |
| 15,196 km (Irish average) | ~2,500 kWh | 7 | 3.1 kWp |
| 20,000 km | ~3,300 kWh | 9 | 4.0 kWp |
| 25,000 km | ~4,125 kWh | 11 | 4.8 kWp |
Worth knowing before you size off the national average: it hides a wide spread. The same CSO table puts diesel cars at 18,035 km and petrol cars at 11,121 km. Cars in the "other fuel types" bracket, which is where EVs and hybrids sit, averaged 13,808 km. If you are replacing a diesel that does motorway miles, size off your own odometer rather than the average.
Read the panel count for what it is, too. Those seven panels sit on top of whatever the house already uses, not instead of it. The CRU puts average Irish household consumption at 4,200 kWh a year, so a car on average mileage adds roughly another 60% to your existing bill. Our guide to how many solar panels an Irish home needs covers the household half of the sizing.
Your Charger Is More Powerful Than Your Roof
Here is the part the panel-count answer skates over. SEAI puts the maximum output of a home charger at 7.4 kW. The array you just sized to cover the car is about 3 kWp, and on a real Irish afternoon it will be making less than its nameplate. Plug in and the charger asks for more than twice what the roof can give it.
An ordinary charger does not care where the electricity comes from. It draws its 7.4 kW, takes whatever the panels happen to be making at that second, and buys the rest from the grid at whatever your day rate is. People describe this as charging from solar. Most of it is not.
- A solar-matching charger. Chargers with a solar or eco mode watch your export meter and throttle the car down to match the surplus, so the car only takes what would otherwise have gone to the grid. Charging is slow, because it is limited to your genuine surplus.
- Charging in daylight. Solar output in Ireland is concentrated in the middle of the day and heavily weighted to the summer half of the year. If the car is in a car park from nine to five, the overlap between generation and charging is close to zero for most of the working week.
- A home battery. A battery banks the midday surplus and releases it when the car is home, which uncouples charging from generation. It is also the most expensive of the three options. See our battery storage guide.
There is a cheaper cousin of the same idea worth knowing about. A power diverter sends surplus solar to the immersion instead of the grid. It costs a fraction of a battery and solves the same mismatch for hot water rather than for the car.
Solar or a Night Rate? The Answer Is Not What You Expect
Once you have solar and an EV, there are two ways to get a kilowatt-hour into the car on a sunny day, and they are not equally good.
One condition before the numbers, because it decides everything that follows. This compares what to do with a genuine surplus: a unit the house does not need, which would otherwise have gone to the grid. If the car is drawing at a moment when the house would have been importing anyway, you are not choosing between exporting and self-consuming at all, and every unit the panels supply saves you the full day rate.
Charge off the panels. The unit costs you nothing at the meter, but it is a unit you no longer export. Bord Gáis Energy currently pays 18.5c per kWh under its Microgen Export Plan. So the real cost of that unit is the 18.5c you gave up.
Export the solar and charge overnight. You collect the 18.5c export payment, then buy the unit back in the small hours on an EV tariff. Energia's EV Smart Drive charges 9.42c per kWh between 2am and 6am. Electric Ireland's Nightboost plan has a 10.88c band between 2am and 4am.
| Way of charging | You pay | You give up | Net per kWh |
|---|---|---|---|
| Straight off the panels (genuine surplus) | Nothing | 18.5c export | −18.5c |
| Export, then charge 2am–6am (Energia) | 9.42c | Nothing | +9.1c |
| Export, then charge 2am–4am (Electric Ireland) | 10.88c | Nothing | +7.6c |
| Straight off the panels, no night rate available | Nothing | 18.5c export | −18.5c, but you avoid a 37.60c day unit |
On 2,500 kWh of charging a year, that 9c gap is roughly €225. The counter-intuitive conclusion holds at today's rates: if you can get onto a cheap EV night band and shift your charging into it, selling your sunshine and buying it back at 2am beats putting it in the car yourself.
- You need a smart meter and an EV tariff. No smart meter, no half-hourly night band, and the comparison collapses.
- EV tariffs charge more for everything else. Electric Ireland's Nightboost day rate is 37.60c per kWh, against 29.81c on their 24-hour smart plan. You are buying a cheap window by paying more for the other twenty-two hours, so the plan only wins if you genuinely move a big block of use into the window.
- Export rates move. The Clean Export Guarantee is set by each supplier and changes with notice, most recently in August 2026. If your export rate falls, self-consumption gets more attractive again. Our CEG rate comparison tracks where each supplier stands.
And if you have no night rate at all, the arithmetic is one-sided the other way. Avoiding a 37.60c day unit while giving up an 18.5c export unit puts you 19c ahead every time, which is the strongest case for solar charging there is. Which plan you are on matters more than which panels you bought, and that is the same conclusion we reached in the best electricity plan for solar owners.
The Charger, the Grant and the Paperwork
SEAI puts a home charger and its installation at €1,200 to €1,600. The grant, administered by SEAI on behalf of Zero Emission Vehicles Ireland, is worth up to €300 towards the purchase and installation, and the work has to be done by a Safe Electric registered electrical contractor for the payment to issue. You do not need to own an EV to apply. Full detail is in our EV home charger grant guide, and the car-side supports are in the electric car grant guide.
One trap on the solar side. If you are adding panels specifically to feed the car, check where that leaves your total array. Microgeneration in Ireland means an export capacity of 6 kW or less on single phase, or 11 kW on three phase, notified to ESB Networks on an NC6 form with no connection charge. Go past it and you are into a mini-generation application, a technical study and a fee. Our guide to the maximum solar system size in Ireland covers where the thresholds sit and why they are about the inverter, not the panels.
The SEAI solar grant does not change because you drive an EV. It is worth up to €1,800 for a domestic system and is paid on the panels, one grant per home, whatever you use the electricity for. See the SEAI solar grant guide for the tier maths.
So Is It Worth Adding Panels for the Car?
Yes, but not for the reason people usually give. Adding a few panels does not make your driving free, and on current rates it may not even be the cheapest way to fill the battery. What it does is raise the ceiling on how much of your own electricity you can use, and an EV is one of the few loads in a house big enough and flexible enough to soak up a genuine midday surplus.
The order that makes sense for most Irish homes: get the tariff right first, because it is free to change and it is where the biggest single number sits. Then get a charger that can follow your solar output, so the surplus has somewhere to go. Then, if the roof has room, add the panels. Doing it in that order means every panel you add is actually used rather than exported at a fraction of what you would otherwise have paid.
Sizing an array around an EV is a different job to sizing one around a house, so ask each installer to price the panels, the inverter headroom and the charger together rather than separately. Free quotes from SEAI-registered installers covering your county. No obligation, takes about 60 seconds.
Get Free Quotes →Frequently Asked Questions
About seven 440 W panels, or roughly a 3 kWp array, to match the yearly mileage of an average Irish car. That works from the CSO's 15,196 km average for private cars in 2023 and SEAI's figure of 15 kWh per 100 km, which comes to about 2,500 kWh at the meter, against roughly 370 kWh a year from each panel at Irish yields. Those panels are in addition to whatever the house itself needs.
Only with a charger that has a solar or eco mode. A standard home charger draws up to 7.4 kW and takes the shortfall from the grid without telling you, so a 3 kWp array supplies well under half of it on a good day. A solar-matching charger reads your export and throttles the car to the surplus, which charges slowly but genuinely runs on your own generation.
At August 2026 rates, a cheap EV night band usually wins. Charging off your panels costs you the export payment you gave up, currently 18.5c per kWh with Bord Gáis Energy. Exporting instead and buying the unit back on Energia's EV Smart Drive at 9.42c between 2am and 6am leaves you about 9c per kWh ahead. This only holds if you have a smart meter, an EV tariff and the ability to move charging into the window, and EV tariffs carry a higher day rate in exchange.
No. A battery is one way to bridge the gap between midday generation and evening charging, but it is the most expensive one. A solar-matching charger achieves much of the same thing for a fraction of the cost, provided the car is at home during daylight. A battery earns its keep when the car is out all day and you want the surplus stored rather than exported.
Yes. SEAI administers a grant of up to €300 towards the purchase and installation of a home charger on behalf of Zero Emission Vehicles Ireland. It is open to homeowners whether or not they currently own an electric vehicle, and the installation must be carried out by a Safe Electric registered electrical contractor for the grant to be paid.
It can. Microgeneration means a maximum export capacity of 6 kW on single phase or 11 kW on three phase, notified to ESB Networks on an NC6 form at no charge. The threshold is set by your inverter's export capacity rather than the panel count, so adding panels behind an existing inverter often does not move it. Going past the limit means a mini-generation application, a technical study and a fee.
Yes, and that is the point of it. Every unit the car takes from your panels is a unit that never reaches the grid, so your metered export falls and your Clean Export Guarantee payment falls with it. That is only a bad outcome if the unit was worth more exported than used, which is exactly what the night-rate comparison above tests.
Longer than you would like. SEAI notes that AC charging at 7 kW adds about 100 km in two hours, but a 3 kWp array rarely sustains anything close to 7 kW in Ireland. Running purely on surplus, a bright summer afternoon might add 50 to 80 km. Solar-only charging suits topping up a commute rather than filling an empty battery before a trip.
Sources: CSO Road Traffic Volumes, table THA18 (Road Traffic Volumes of Private Cars) — average kilometres travelled per private car, State, all owners, all fuel types: 15,196 km in 2023, the latest year published; petrol 11,121 km, diesel 18,035 km, other fuel types 13,808 km. SEAI — Charging an electric vehicle — home charger maximum 7.4 kW, charger and installation €1,200–€1,600, 100 km added in approximately two hours at 7 kW, and the three factors that set home charging cost. SEAI — Electric vehicle home charger grant — up to €300, Safe Electric registered contractor required, open to homeowners without an EV. SEAI's published figure of 15 kWh per 100 km for average EV consumption. Bord Gáis Energy — Microgeneration — Microgen Export Plan rate of 18.5c per kWh. Energia — EV plans — EV Smart Drive at 9.42c per kWh from 2am to 6am. Electric Ireland — price plans — Nightboost day 37.60c, night 18.54c, Night Boost 10.88c between 2am and 4am; 24-hour smart plan 29.81c. Electric Ireland — Estimated Annual Bill — CRU reference consumption of 4,200 kWh a year. All supplier rates checked 6 August 2026 and subject to change with notice; suppliers do not all quote on the same VAT basis, so price your own two plans side by side before switching. Panel output assumes Irish yields of 800–900 kWh per kWp per year and a 440 W panel. Charging losses assumed at roughly 10% between meter and battery, which varies by car and by temperature.
Published: 6 August 2026. Author: Neil Russell.