Blog
24 guidesSolar knowledge,
no fluff
Data-backed guides on solar panels, EV charging, and getting the most from the sun.
How Long Do Solar Panels Take to Pay for Themselves in Europe?
Solar panel payback periods range from under 6 years in southern Spain to 13+ years in northern Scandinavia. Here's what drives the number — and what happens after.
See our 2026 Solar + EV Payback Index
22 European countries ranked by how fast a solar system pays for itself when charging an EV — computed from real PVGIS data.
Solar Basics
4- Solar Basics5 min read
Is It Worth Getting Solar Panels Just for EV Charging?
Solar panels installed primarily for EV charging can pay back in 6–10 years across most of Europe. But whether it makes sense for you depends on three variables.
- Solar Basics4 min read
EV Charging in Winter: Do Solar Panels Still Work?
Solar panels work in winter — but output drops to 20–30% of summer levels. Here's what that means for EV charging, and how to get the most out of cold-season solar.
- Solar Basics5 min read
How Many Solar Panels Do You Actually Need to Charge an EV?
Most calculators give you a generic number. We break down the real math — roof size, panel efficiency, sun hours, and your specific EV model.
- Solar Basics4 min read
Monocrystalline vs Polycrystalline: Which Panel Is Right for You?
Efficiency, cost, longevity — the differences are real but often overstated. Here's what actually matters for a residential installation.
Country Guide
11- Country Guide8 min read
Is It Cheaper to Charge Your EV From Solar or Export It? (UK, 2026)
The instinct is always to use your own solar. In the UK in 2026 that's often the wrong call for EV charging — and one line of arithmetic tells you which way to go.
- Country Guide7 min read
Solar Panels on a Flat Roof in the UK: Mounting, Tilt, and What It Really Costs
Flat roofs are one of the best-kept secrets in UK solar — you choose the tilt and direction. But mounting, row spacing, and roof condition change the maths. Here's what to know before you install.
- Country Guide7 min read
Solar Panels for EV Charging in France: Why Autoconsommation Beats Selling to the Grid
France has cheap, low-carbon nuclear electricity and a feed-in rate five times lower than the retail price — a combination that makes charging your EV from your own panels the whole game.
- Country Guide6 min read
Can You Get Solar Panels on a Terraced House in the UK?
Most terraced houses can get solar panels — but roof direction, shading, and permitted development rules matter. Here's what UK terraced homeowners need to know before calling an installer.
- Country Guide5 min read
EV Charging Cost Per Mile in the UK: Home Solar vs Grid vs Public Charging
Charging an EV from home solar costs around 0.5–1p per mile. From a home tariff it's 3–5p. From a public rapid charger, up to 13p. The difference over 10,000 miles a year is over £1,000.
- Country Guide6 min read
Octopus Energy + Solar Panels: The Best EV Charging Setup in the UK?
Octopus Energy's Flux, Intelligent Octopus, and Go tariffs can transform what solar panels earn and what overnight EV charging costs. Here's how to combine them correctly.
- Country Guide7 min read
Solar Panels for EV Charging in Germany: Zero VAT, Low Feed-in, and Why Self-Consumption Is Everything
Germany has Europe's highest electricity prices and historic low feed-in tariffs — a combination that makes EV self-consumption the single most important solar decision you can make.
- Country Guide6 min read
Solar Panels for EV Charging in Poland: Mój Prąd, Net Billing, and the Real Numbers
Poland is one of the fastest-growing solar markets in the EU. Rising electricity prices, generous subsidies, and a coal-heavy grid make the case for solar + EV unusually strong.
- Country Guide6 min read
Solar Panels for EV Charging in Italy: High Tariffs, Superbonus Successor, and Why the Maths Are Compelling
Italy combines some of Europe's highest electricity prices with excellent irradiance and a 50% tax deduction on solar installations. For EV owners, the payback can be under 4 years.
- Country Guide6 min read
Solar Panels for EV Charging in the UK: Tariffs, Smart Export Guarantee, and the Real Payback
0% VAT, Smart Export Guarantee revenue, and Octopus-style dynamic tariffs make UK solar for EV owners more financially interesting than the irradiance numbers alone suggest.
- Country Guide5 min read
Solar Panels for EV Charging in Romania: Casa Verde, PNRR Grants, and What to Expect
Romania's low electricity prices make solar payback longer — but the Casa Verde AFM grant can cover most or all of a small system's cost, changing the calculation entirely.
Solar + Storage
4- Solar + Storage6 min read
Is a Home Battery Worth It for EV Charging in Germany? Zero VAT, No Grants, and the Self-Consumption Gap
Germany hands solar owners the biggest self-consumption gap in Europe — around 32 ct retail against a 7.78 ct feed-in. That's why one in two systems ships with a battery. But with no grant left and your EV already a battery on wheels, here's when storage actually pays.
- Solar + Storage6 min read
Is a Home Battery Worth It for EV Charging in Italy? The 50% Detrazione Changes the Maths
Italy is the one market where a home battery makes clean financial sense: the 50% detrazione halves the cost and pulls payback inside the 10-year warranty. Here's the honest maths for charging an EV from stored solar — and the tax caveat that decides it.
- Solar + Storage6 min read
Is a Home Battery Worth It for EV Charging in Poland? Net Billing, Mój Prąd, and the Real Numbers
Under net billing, exported solar earns roughly half what you pay to import — so self-consumption is the whole game. Here's when a home battery genuinely pays for a Polish EV owner, and when your car is the only battery you need.
- Solar + Storage5 min read
Solar Panels + Home Battery for EV: Is a Powerwall Worth It?
Home batteries store surplus solar for evening EV charging — but the math is tighter than for panels alone. Here's when storage genuinely pays.
Calculator Guide
2- Calculator Guide5 min read
How to Read the VoltSun Charge Planner: A Card-by-Card Guide
Five data panels, one decision: when to plug in. This guide explains what each number, chart, and score in the Charge Planner actually means — and how to act on it.
- Calculator Guide6 min read
How to Read Your EV Solar Calculator Results: A Card-by-Card Guide
Eight cards, eight answers. This guide explains exactly what each number and progress bar means in the VoltSun EV solar calculator — no formulas needed.
Data & Science
2- Data & Science4 min read
How Many kWh Does a Solar Panel Produce Per Day?
A standard 400W panel produces 1.0–2.8 kWh per day depending on location and season. Here's the real math — by city, by month, and what it means for your EV.
- Data & Science4 min read
PVGIS vs NASA POWER: Which Solar Irradiance Data Should You Trust?
Both are free, both are authoritative — but they serve different purposes. Here's when to use each and what the numbers actually mean.