Blog
Solar knowledge,
no fluff
Data-backed guides on solar panels, EV charging, and getting the most from the sun.
- 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.
- 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 + 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.
- 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.
- Solar Basics5 min read
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.
- 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.
- 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.
- 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.