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A hundred kilowatt-hours go in. Eighty-five come out. Those fifteen did not disappear. This is the full route one kilowatt-hour takes from your roof to your kettle, with the arithmetic included: why a solar panel cannot produce anything but DC, why a plug-in battery sits at 48 volts while a fixed installation does not, and the four places where that fifteen percent leaves as heat.
Salespeople say a plug-in battery can't trade. That's true for one of the three meanings of that word, and not for the other two. Here's which brands you can control locally, why your energy supplier is the real bottleneck, and why a cheap hour can still cost you money — with the 590-day backtest that backs it up.
Almost 90,000 home batteries were added in the Netherlands in 2025. More than half of new sales are now plug-in units, and a large share of those appear in no official register at all. Not because they are exempt: reporting is mandatory, below 800 watts too. Here are all the numbers, all the sources and the calculation most sellers skip.
The honest math behind home batteries in 2026. When will you earn back your investment, when won't you, and which factors make the difference? With concrete scenarios and current prices.
