Does it still make economic sense to drive an electric car without its own photovoltaics? In 2026, the answer is increasingly difficult. Public DC chargers can cost as much as refuelling a diesel - and the queues for free poles in the Tri-City are looking more and more like the queues for a petrol station in 2022. But there is a way out: turn your own rooftop into a petrol station that doesn't bill.
The trap of public chargers
When buying an electric car, most drivers hope to save money. The bill looks attractive until you start using public fast charging stations regularly. In 2026, prices at DC stations in Poland will reach 2.20-2.80 PLN/kWh, and with peak charging, some operators add a charge per minute of parking. With an average consumption of 18 kWh/100 km, driving 100 kilometres then costs 40-50 PLN - almost the same as with 95 petrol.
Then there's the time involved. A DC fast charger requires at least 25-40 minutes to recharge the 80%'s battery, and popular locations in Gdansk, Gdynia or Sopot are sometimes busy - especially at weekends and after 5 p.m. Electricity is no longer cheaper than petrol, and convenience - its main promise - evaporates on the third visit to a busy pole.
Conclusion: An electric car without a home charger and its own photovoltaics can be a financially worse choice than a modern diesel with a mild hybrid system. The savings from buying an EV disappear with heavy use of public infrastructure.
Own solar fuel - the figures that say it all
In contrast: charging an electric car from its own photovoltaic installation during energy production hours has a cost close to zero. This is not marketing - it is physics. Every kilowatt hour produced by the panels on your roof and transferred directly to your vehicle's battery is energy at zero, apart from the cost of amortising your investment.
|
18 kWh average car consumption per 100 km (2026) |
~2.5 kWp additional PV power for 15 000 km/year |
PLN 0.05 actual cost/kWh from own PV |
With an annual mileage of 15 000 km, an electric car needs around 2 700 kWh per year. A 2.5-3 kWp photovoltaic installation, with 1 650 hours of sunshine typical for the Pomeranian region, will produce just that much. This means that extension of an existing installation by just a few panels can completely „refuel” a car - all year round.
Technology 2026: smart wallbox and EMS system
Just having a PV system and a charger in the garage is not enough - the key lies in integrating them. Modern wallboxes support the function Smart Charging, which monitors the real-time energy production of the panels and automatically starts or increases the charging power at peak production times. In practice: the system sees that the installation is producing a 5 kW surplus, and immediately directs it to the car's battery instead of sending it back to the grid at a low wholesale price.
- Dynamic tariffs - when PV charging is not possible (night, cloudy day), the intelligent EMS system selects the cheapest windows on the spot market and tops up the battery at night rates that are 3-4 times lower than peak rates
- EMS/HEMS - home energy management systems connect wallbox, inverter, energy storage and weather forecast into one ecosystem; mobile app gives full control and real-time statistics
- V2H/V2G integration - the latest car models (e.g. Hyundai IONIQ 5, Nissan Leaf) can return battery power to the home during peak hours, turning the car into an additional energy store
💡 EXAMPLE FROM LIFE
Owner installs 8 kWp + 10 kWh storage + 11 kW wallbox in Gdynia. The system recharges the car from 10:00 to 14:00 when PV production exceeds the current consumption of the house. Daily recharge: 20-35 kWh on a sunny day = 110-190 km range - without taking a single penny from your electricity bill.
Why is the standard 4 kWp not enough today?
Installations designed 4-5 years ago were calculated for a „standard” house without an electric car. Today, a house with a heat pump and an electric car looks energetically very different:
| Device | Annual consumption | PV power required |
|---|---|---|
| Home (white goods, lighting, electronics) | 3 500 kWh | 3.5-4 kWp |
| Heat pump (heating + DHW) | 4 000 kWh | 3.5-4 kWp |
| Electric car (15 000 km/year) | 2 700 kWh | 2.5-3 kWp |
| TOTAL | ~10,200 kWh | 9.5-11 kWp |
A 4 kWp installation barely covers a third of such demand. Extension of photovoltaic installation by 3-5 kWp after the purchase of an electric vehicle is not an option, but a prerequisite for the viability of the entire system. A good installer selects the power of the extension for the specific car model - based on the actual mileage and charging profile.
Hard economic data: petrol vs. grid vs. solar
| Energy source | Cost per 100 km | 15,000 km/year | PV payback time |
|---|---|---|---|
| Petrol 95 (6.5 l/100 km) | ~£44 | ~£6,600 | — |
| Mains electricity (G11 tariff) | ~£27 | ~£4,050 | — |
| Current from a public DC charger | ~£45 | ~£6,750 | — |
| Electricity from own PV (depreciation) | ~£4 | ~£600 | shortening by 2-3 years |
The difference between charging from a public charger and your own PV is over £6,000 per year - at a mileage of 15,000 km. This money directly reduces the payback time of the entire installation. With a typical expansion budget of £15,000-20,000, the fuel savings alone pay off the expansion in 3 years. Each additional year is pure profit.
The value of the property is also worth mentioning. Houses with a PV installation, wallbox and EMS system obtain in the Tri-city by 5-8% higher valuations in the aftermarket - your own charging station is becoming as attractive as a garage or underfloor heating.
Tri-City: why a home garage is the best base for an EV
The Pomeranian Voivodeship records around 1 650 hours of sunshine per year, with a clear peak from May to September. This is enough to charge the car exclusively from the sun during the season - without touching the meter. In the low season, the intelligent EMS system supplements the rest from the cheapest tariff windows.
Single-family homeowners in Gdansk, Gdynia and the surrounding area have a natural advantage here: their own garage or driveway, a roof with good exposure and - importantly - no residential community to block the installation of a wallbox. The car charges overnight and is always full in the morning. No searching for free posts, no waiting, no surprises on the bill.
Summary
Photovoltaics and the electric car are a natural pair - but only if the installation is properly sized and the charger intelligently integrated into the home's energy system. Without this, an electric car can prove more expensive to run than modern petrol. With its own fuel station on the roof - it becomes the cheapest mode of transport you've ever owned.
- Charging from your own PV costs £4-5/100 km vs. £44-45 with petrol or a public DC charger
- A 2.5-3 kWp expansion fully covers an annual mileage of 15,000 km
- Smart wallbox + EMS system + dynamic tariffs = maximum self-consumption of energy effortlessly
- Payback time of entire PV investment reduced by 2-3 years due to fuel savings
