Solar panels, home batteries, EV charging and electricity prices, explained with measured data instead of sales talk. Presented by Joulie, our animated smart meter.
Every video starts from a real question and ends with real numbers. No installer pitch, no jargon you don't need.
Home batteries, heat pumps, EV charging: what they really save over the years.
How your inverter decides where solar power goes, and why.
“Solar is useless in winter.” “Batteries pay back in 5 years.” We test them.
Dynamic tariffs, vehicle-to-home and new battery chemistry, in plain English.
First up: “Are home batteries actually worth it?” using a full season of data from our own 5 kWh battery.
Put in your own prices and battery cost. The defaults are measured data from a real 5 kWh battery in a solar home in Portugal (July–October 2026), with an assumption for winter.
Same battery, same export price and efficiency; only the import price changes. Outlined bar = your price. Dashed line = warranty.
This calculator explains the math; it is not financial or installation advice. It ignores battery degradation, price changes over time, subsidies, dynamic-tariff arbitrage and backup value. Your prices, rules and usage may differ.
The video walks through a whole season of battery data, day by day.