Why this site?
A home battery, solar panels, a heat pump or insulation: they are big expenses, and the question is always the same. Does it pay off? Most calculators come from parties that sell something and assume rosy returns. We work it out per measure, with Dutch tariffs and rules. We start with the home battery, because net metering ends on 1 January 2027; the other measures will follow.
Independent
- We do not sell products and do not pass your details on to installers.
- You do not have to leave an email address or phone number to see the result.
- The outcome can just as well be "don't". For many households that is the honest answer right now.
Verifiable
Every calculator runs on its own tested engine. For the home battery that is an hourly simulation of solar power, consumption and battery. All formulas, defaults and sources are on the method page, as are the points where the model falls short. The amounts in the guides are recalculated at every update with the same engine as the calculator, so text and results cannot drift apart.
Up to date
Tariffs and rules change quickly. The defaults were last checked on 11 November 2026. Always check the amounts in your own contract and enter those: that makes the result most reliable.
What the calculators are not
The result is an estimate, not financial advice. Your actual saving depends on your hourly consumption, the weather and future tariffs. No rights can be derived from the results. For an actual purchase, always request several quotes and check the warranty and safety certification.
Privacy
The calculation runs entirely in your own browser. We set no cookies and do not track you. Read the privacy statement.