Solar Panels & EV Charging in Ireland: Power Your Car from Your Roof
Solar panels and EV charging are a natural combination. Your solar panels generate free electricity during the day, and your EV sits in the driveway ready to soak it up. With the right setup, you can charge your car for free using solar energy. With over 100,000 EVs now on Irish roads, this combination is becoming increasingly popular.
Fact-checked by John Rooney, Solar Energy Editor. Editorial policy
Quick Answer
A 4–6 kWp solar system generates enough electricity to charge an EV for 10,000–15,000 km/year for free. Combined, solar panels and an EV save Irish households €2,500+ per year versus grid electricity and petrol. A solar-compatible EV charger like Zappi or myenergi can prioritise solar surplus automatically.
Why combine solar panels with EV charging?
If you drive an electric car and have solar panels on your roof, you can charge your car using free electricity from the sun. This eliminates fuel costs entirely during sunny months and drastically reduces them year-round.
Ireland's EV adoption is accelerating. With over 100,000 EVs registered and the government targeting 845,000 by 2030, more Irish homeowners are looking at ways to reduce the cost of charging. Solar panels are the most practical solution.
The economics are compelling. Charging from the grid costs around 35c/kWh. Charging from your own solar panels costs nothing. Even if you only cover 50% of your EV charging with solar, you save over €500 per year on electricity alone, on top of the €1,500+ you already save by driving electric instead of petrol.
€0
Cost to charge from solar
100,000+
EVs on Irish roads
€2,500+
Annual transport savings
How does solar EV charging work?
Solar EV charging is straightforward. Your solar panels feed electricity into your home circuit, and your EV charger draws from that same circuit. When solar is generating, your car charges from free solar electricity first.
1. Solar panels generate electricity
Your rooftop panels convert sunlight into electricity during daylight hours, typically from 7am to 7pm in summer and 9am to 4pm in winter.
2. Your EV charger draws power
A home EV charger (typically 7.2 kW) draws power from your home circuit. When solar is generating, the charger uses solar electricity first.
3. Smart chargers prioritise solar
A solar-aware charger (like the Zappi) automatically adjusts charging speed to match your solar output, so you only charge from free solar energy.
4. Excess goes to the grid
Any solar electricity you don't use for the car or your home is exported to the grid. You get paid 15-24c/kWh for exported electricity.
5. Grid fills the gap
At night or on cloudy days, your EV charges from the grid as normal. Night-rate electricity (if available) can reduce this cost further.
6. Battery storage (optional)
A home battery can store solar energy during the day for overnight EV charging. This increases solar self-consumption but adds €3,000-€6,000 to the cost.
How much can you save charging your EV with solar?
The savings from combining solar panels with EV charging come from two sources: free solar electricity replacing grid electricity, and driving electric instead of petrol. Together, these savings add up to €2,500-€3,500 per year for a typical Irish household.
| Cost Category | Without Solar + EV | With Solar + EV | Annual Saving |
|---|---|---|---|
| Fuel / charging (15,000 km/year) | €2,000-€3,000 (petrol) | €525-€1,050 (grid + solar mix) | €1,000-€2,500 |
| Home electricity | €1,800-€2,400/year | €800-€1,400/year (with solar) | €800-€1,200 |
| Total annual transport + energy | €3,800-€5,400 | €1,325-€2,450 | €2,500-€3,500 |
EV charging cost by solar coverage
The more of your EV charging you cover with solar, the greater your savings. A smart charger or solar diverter significantly increases the percentage of solar-powered charging.
| Solar Coverage | Setup | Annual EV Charging Cost | Annual Saving vs Grid |
|---|---|---|---|
| 0% (grid only) | No solar panels | €1,050 | €0 |
| 30% | Solar + standard charger | €735 | €315 |
| 50% | Solar + timed charging | €525 | €525 |
| 70% | Solar + smart charger (e.g. Zappi) | €315 | €735 |
| 85% | Solar + smart charger + battery | €158 | €892 |
Based on average EV consumption of 3,000 kWh/year (15,000 km at ~20 kWh/100 km). Grid electricity at 35c/kWh. Petrol comparison based on €1.75/litre at 7L/100km.
Best EV chargers for use with solar panels
Not all EV chargers work equally well with solar panels. A solar-aware charger can automatically adjust its charging rate to match your solar output, ensuring you charge from free solar electricity rather than the grid.
| Charger Type | Power | Cost (Installed) | Solar Compatibility | Best For |
|---|---|---|---|---|
| Standard home charger | 3.6 kW | €400-€600 | Basic (manual scheduling) | Budget option, overnight charging |
| Fast home charger | 7.2 kW | €600-€1,000 | Good (app scheduling) | Most common choice, SEAI grant eligible |
| Solar-smart charger (e.g. Zappi) | 7.2 kW | €800-€1,500 | Excellent (auto solar mode) | Best for solar + EV combination |
| Tesla Wall Connector | 7.4 kW | €700-€1,100 | Good (app scheduling, Tesla solar integration) | Tesla owners |
Popular EV charger brands in Ireland
myenergi Zappi
The top choice for solar + EV. Built-in “Eco” and “Eco+” modes that charge only from surplus solar. No extra hardware needed.
Ohme
Smart scheduling via app. Can be set to charge during peak solar hours. Works with all EVs. Competitive pricing.
Wallbox Pulsar Plus
Compact design with app control. Power sharing and scheduling features. Good build quality and reliability.
Tesla Wall Connector
Best integration with Tesla vehicles and Tesla solar/Powerwall systems. Works with non-Tesla EVs too.
All chargers listed are available through SEAI-registered installers in Ireland. The SEAI home charger grant of up to €300 applies to most models. Prices include installation.
What size solar system do you need to charge an EV?
A typical EV needs around 3,000 kWh per year for charging (based on 15,000 km of driving). A standard 4 kWp solar system generates approximately 3,800 kWh per year in Ireland. But you can't dedicate all of that to the car, because your home needs electricity too.
For most households, a 5-6 kWp system is the sweet spot if you want to cover both home electricity and EV charging. A 4 kWp system works well if you accept that 50-60% of your EV charging will come from solar, with the grid covering the rest.
| System Size | Annual Output | Home Use | Available for EV | EV Coverage | Best For |
|---|---|---|---|---|---|
| 3.5 kWp (8 panels) | ~3,100 kWh | ~2,000 kWh | ~1,100 kWh | ~37% | Small home, occasional driving |
| 4.4 kWp (10 panels) | ~3,900 kWh | ~2,200 kWh | ~1,700 kWh | ~57% | Average home + EV |
| 5.3 kWp (12 panels) | ~4,700 kWh | ~2,200 kWh | ~2,500 kWh | ~83% | Recommended for home + EV |
| 6.6 kWp (15 panels) | ~5,900 kWh | ~2,200 kWh | ~3,700 kWh | ~100%+ | Full coverage, high mileage |
Output based on Irish average of ~884 kWh/kWp/year. Home use assumes average household consumption of 4,200 kWh/year with 55% self-consumption. EV consumption assumes 3,000 kWh/year. Actual figures depend on your location, roof orientation, and driving habits.
Smart and solar-aware charging
The key to maximising solar EV charging is timing. You want your car to charge when the sun is shining, not at night. There are several ways to achieve this.
Zappi Eco and Eco+ Modes
The myenergi Zappi charger has built-in solar modes. “Eco” mode uses surplus solar but tops up from the grid if needed. “Eco+” mode charges only from surplus solar, giving you 100% free charging (but slower).
App-Based Scheduling
Chargers like Ohme and Wallbox let you schedule charging via their app. Set your EV to charge between 10am and 3pm when solar output peaks. Simple and effective.
Solar Diverters
A solar diverter (like the myenergi eddi) redirects surplus solar electricity to your EV charger or immersion heater. This ensures nothing is wasted when the sun is shining.
Timer-Based Approach
The simplest method: plug in your EV each morning and set the car's built-in timer to charge between 10am and 3pm. No extra hardware needed, and it captures most of the solar peak.
A smart charger with solar integration typically costs €200-€500 more than a standard charger. The extra cost pays for itself within 1-2 years through increased solar self-consumption.
Available grants for solar panels and EV charging
Irish homeowners can claim separate grants for both solar panels and EV chargers. These grants are stackable, meaning you can claim both. Additional EV incentives further reduce the cost of going electric.
| Grant / Incentive | Amount | Provider | Details |
|---|---|---|---|
| Solar PV grant | Up to €1,800 | SEAI | For systems up to 4 kWp. Must use SEAI-registered installer. Home must be built and occupied before 2021. |
| EV home charger grant | Up to €300 | SEAI | For a home EV charging point. Available once per household. Must have an EV purchased after 2018. |
| VRT relief on EVs | Up to €5,000 | Revenue | Lower Vehicle Registration Tax band for battery electric vehicles. |
| Toll discounts | 50% off tolls | TII | Electric vehicles qualify for reduced tolling on all national toll roads. |
| Company car BIK | €0 BIK (to €50,000) | Revenue | Zero Benefit-in-Kind on electric company cars valued up to €50,000. Significant tax saving for employees. |
Combined savings example
A homeowner installing a 5.3 kWp solar system (€9,200 before grant) and a Zappi EV charger (€1,200 installed) would receive up to €1,800 from the SEAI solar grant and up to €300 from the EV charger grant. That brings the total net cost to approximately €8,300 for both systems, delivering annual savings of €2,500+ on transport and electricity.
Frequently Asked Questions About Solar EV Charging
Can I charge my electric car with solar panels?
Yes. Solar panels generate electricity that feeds into your home circuit. Your EV charger draws from the same circuit, so when your panels are generating, your car charges from solar energy. With a solar-aware charger like the Zappi, you can set it to charge only from surplus solar.
How many solar panels do I need to charge an EV?
A typical EV needs around 3,000 kWh per year for charging (15,000 km of driving). To cover this plus your home electricity, you need a 5-6 kWp system (12-14 panels). A smaller 4 kWp system (10 panels) will cover about 50-60% of your EV charging from solar, with the grid covering the rest.
What is the best EV charger for use with solar panels?
The myenergi Zappi is widely considered the best EV charger for solar panel owners. It has built-in solar tracking modes (Eco and Eco+) that automatically adjust charging speed to match your solar output. No additional hardware or software is needed. It costs around \u20ac800-\u20ac1,500 installed.
How much money can I save charging my EV with solar?
Charging a typical EV from the grid costs around €1,050 per year (3,000 kWh at 35c/kWh). If 50% of your charging comes from solar, you save €525/year. With a smart charger achieving 70% solar coverage, you save €735/year. Combined with the savings from driving electric instead of petrol (€1,500-€2,000/year), total transport savings reach €2,500-€3,500/year.
Can I charge my EV at night with solar energy?
Not directly, since solar panels only generate electricity during daylight. However, you can store solar energy in a home battery (5-10 kWh) during the day and use it to charge your EV at night. This adds \u20ac3,000-\u20ac6,000 to the system cost. A more cost-effective approach is to charge during the day when solar is generating and use night-rate electricity for any top-up charging needed.
Is there a grant for EV chargers in Ireland?
Yes. The SEAI offers a grant of up to €300 towards the cost of installing a home EV charging point. This is separate from the solar panel grant (up to €1,800), so you can claim both. The EV charger grant requires an EV purchased after 2018 and is available once per household.
Do I need a bigger solar system if I have an EV?
It depends on how much EV charging you want to cover with solar. A standard 4 kWp system is enough for most homes without an EV. If you have an EV, upgrading to a 5-6 kWp system gives you enough solar to cover most of your home electricity and a large portion of your EV charging. The additional 1-2 kWp costs approximately €1,500-€3,000 extra.
Can I charge my EV from solar panels without a battery?
Yes, absolutely. A home battery is not required for solar EV charging. During the day, your solar panels feed electricity directly to your EV charger. A smart charger like the Zappi matches the charging rate to your solar output in real time. A battery is only needed if you want to store solar energy for overnight charging, and most EV owners find daytime charging sufficient.
Related Guides
Sources
- SEAI: Solar Electricity Grant, seai.ie
- SEAI: Electric Vehicle Home Charger Grant, seai.ie
- ESB eCars: Home Charging, esb.ie
- ZEVI: Zero Emission Vehicles Ireland, gov.ie
John Rooney is the founder of Solar Info and has been covering the Irish solar energy market since 2023. He fact-checks all content against official SEAI data and maintains relationships with SEAI-registered installers across Ireland.
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